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me  search
Meade Basin  search
RTAlaska
 Kansas
 Northern Alaska
 Meade County Kansas
SNLocated in Meade County, SW Kansas. Also a river basin S of Point Barrow in N Alaska, with coal mining in area. Indexed with states and counties as applicable.
Meade County Kansas  search
BTUnited States
 .Kansas
 ..Meade County Kansas
RTMeade Basin
SNSW Kansas.
Meade County Kentucky  search
BTUnited States
 .Kentucky
 ..Meade County Kentucky
SNNW Kentucky.
Meade County South Dakota  search
BTUnited States
 .South Dakota
 ..Meade County South Dakota
RTBlack Hills
 Whitewood Creek
SNW central South Dakota.
Meade Peak Member  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Permian
 ....Meade Peak Member
RTIdaho
 Utah
 Wyoming
 Montana
 Phosphoria Formation
SNOf Phosphoria Formation. E Idaho, SW Montana, E Utah and W Wyoming. Added to Thesaurus in 1989.
Meadow soils  search
BTsoils
 .Meadow soils
RTsoil group
 Intrazonal soils
Meager, Mount  search
USEMount Meager
Meagher County Montana  search
BTUnited States
 .Montana
 ..Meagher County Montana
RTBig Belt Mountains
 Bridger Range
 Crazy Mountains Basin
SNCentral Montana.
meandering  search
USEmeanders
meanders  search
BTfluvial features
 .meanders
UFmeandering
RTgeomorphology
 floodplains
 avulsion
 oxbow lakes
 rivers
 rivers and streams
 streams
 point bars
 sinuosity
measurement  search
UFmeasurements
RTaccuracy
 precision
 geodesy
 conductivity
 satellite methods
 dosimetry
 heat flow
 geothermal gradient
 thermal conductivity
 measurement-while-drilling
 telemetry
measurement while drilling  search
USEmeasurement-while-drilling
measurement-while-drilling  search
UFmeasurement while drilling
RTmeasurement
 well-logging
 methods
 drilling
 boreholes
 downhole methods
 sounding
 techniques
SNBefore 1993, also search MWD. Added to Thesaurus in 1993.
measurements  search
USEmeasurement
Meath Ireland  search
BTEurope
 .Western Europe
 ..Ireland
 ...Meath Ireland
SNCounty on the Irish Sea in NE Ireland.
mechanical analysis  search
SNNot a valid GeoRef index term after 1970. See mechanism; mechanics.
mechanical controls  search
RTmineral deposits, genesis
 controls
SNAs of 1993, restricted to economic studies.
mechanical erosion  search
USEabrasion
mechanical properties  search
RTengineering geology
 physical properties
 properties
 creep
 deformation
 elasticity
 anisotropy
 plasticity
 brittleness
 rigidity
 compactness
 hysteresis
 shear
 elastic limit
 durability
 ductile deformation
 elastic properties
 friction
 hardness
 Poisson's ratio
mechanical weathering  search
BTweathering
 .mechanical weathering
RTinsolation
 physical weathering
SNBefore 1978, also search weathering AND mechanical.
mechanics  search
RTland subsidence
 decollement
 faults
 plate tectonics
 rock mechanics
 soil mechanics
 folds
 computer animation
 shear
 static corrections
 flexural-slip
 stick-slip
mechanism  search
UFmechanisms
RTfocal mechanism
 flow mechanism
mechanisms  search
USEmechanism
Mechelen Belgium  search
USEMalines Belgium
Mechlin Belgium  search
USEMalines Belgium
Mecklenburg  search
BTEurope
 .Central Europe
 ..Germany
 ...Mecklenburg
RTBarth Germany
 Mecklenburg-Western Pomerania Germany
SNRegion on the Baltic Sea in Mecklenburg-Western Pomerania, NE Germany. A former German state.
Mecklenburg County North Carolina  search
BTUnited States
 .North Carolina
 ..Mecklenburg County North Carolina
NTCharlotte North Carolina
 Davidson North Carolina
SNS North Carolina.
Mecklenburg County Virginia  search
BTUnited States
 .Virginia
 ..Mecklenburg County Virginia
SNS Virginia.
Mecklenburg-Vorpommern Germany  search
USEMecklenburg-Western Pomerania Germany
Mecklenburg-Western Pomerania Germany  search
BTEurope
 .Central Europe
 ..Germany
 ...Mecklenburg-Western Pomerania Germany
NTBarth Germany
 Rugen Island
 Schwerin Germany
UFMecklenburg-Vorpommern Germany
RTMecklenburg
 North German Plain
 Oder Valley
 Pomerania
SNState in NE Germany. Before 1993, also search Mecklenburg.
Mecoptera  search
BTInvertebrata
 .Arthropoda
 ..Mandibulata
 ...Insecta
 ....Pterygota
 .....Neoptera
 ......Endopterygota
 .......Mecoptera
UFMecopteroida
SNOrder.
Mecopteroida  search
USEMecoptera
Mecosta County Michigan  search
BTUnited States
 .Michigan
 ..Michigan Lower Peninsula
 ...Mecosta County Michigan
Mecsek Mountains  search
BTngary
 .Mecsek Mountains
UFBaranya Mountains
SNNear Croatian border in S Hungary. In Baranya. Also search Mecsek.
media  search
USEmaterials
median masses  search
SNAs of 1981, no longer a valid term for GeoRef. See tectonics; orogenic belts.
Median Tectonic Line  search
BTAsia
 .Far East
 ..Japan
 ...Median Tectonic Line
RTtectonics
 plate tectonics
 Honshu
 Kyushu
 Shikoku
SNSouthwest Japan.
median valley  search
UFvalley, median
RTrift zones
 rifting
 mid-ocean ridges
 Mid-Atlantic Ridge
medical geology  search
UFhealth
RTpollution
 environmental geology
 geology
 carcinogens
 human ecology
 forensic geology
medicinal waters  search
RTwater
 water resources
 water quality
 mineral waters
 thermal waters
SNAdded to Thesaurus in 1981.
Medicine Bow Mountains  search
BTUnited States
 .U. S. Rocky Mountains
 ..Medicine Bow Mountains
RTWyoming
 Colorado
 Front Range
 Mullen Creek-Nash Fork shear zone
SNRange of the Rocky Mountains. This term has multiple hierarchies. Indexed with states as applicable.
Medicine Hat Alberta  search
BTCanada
 .Western Canada
 ..Alberta
 ...Medicine Hat Alberta
SNCity in SE Alberta.
Medicine Lake  search
UFMedicine Lake Volcano
RTMontana
 California
 volcanoes
 South Dakota
 Siskiyou County California
 Medicine Lake Highland
 Sheridan County Montana
SNLake and volcano in N California. Also a lake in Sheridan County, NE Montana and in Codington County, NE South Dakota. Indexed with states and counties as applicable.
Medicine Lake Highland  search
BTUnited States
 .California
 ..Siskiyou County California
 ...Medicine Lake Highland
RTMedicine Lake
SNPlateau surrounding Medicine Lake, N California. Added to Thesaurus in 1985.
Medicine Lake Volcano  search
USEMedicine Lake
Medina County Ohio  search
BTUnited States
 .Ohio
 ..Medina County Ohio
SNN Ohio.
Medina County Texas  search
BTUnited States
 .Texas
 ..Medina County Texas
RTEdwards Aquifer
SNSW Texas.
Medina Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Silurian
 ....Lower Silurian
 .....Medina Formation
RTOntario
 Pennsylvania
 New York
 Michigan
 Grimsby Sandstone
Mediterranean (region)  search
USEMediterranean region
Mediterranean region  search
NTAegean Islands
 Balearic Islands
 Calabrian Arc
 El Alboran Island
 Ionian Islands
UFMediterranean (region)
RTItaly
 Algeria
 Turkey
 France
 Albania
 Croatia
 Slovenia
 Dalmatia
 Spain
 Cyprus
 Serbia
 Egypt
 Israel
 Morocco
 Tunisia
 Mediterranean Sea
 Bosnia-Herzegovina
 Greece
 Yugoslav Macedonia
 Lebanon
 Sardinia Italy
 Sicily Italy
 Corsica
 Libya
 Syria
 Elba
 Malta
 Mesogaea
 Yugos
SNThe Mediterranean Sea and its islands, and parts of those countries along its shores in S Europe, N Africa, and the Middle East. Also search Mediterranean. Indexed with Mediterranean Sea, countries and islands as applicable.
Mediterranean Ridge  search
BTMediterranean Sea
 .Mediterranean Ridge
RTEast Mediterranean
 Leg 42A
 DSDP Site 377
 Leg 160
 ODP Site 969
 ODP Site 970
 ODP Site 971
 ODP Site 972
 ODP Site 973
SNExtends S of Crete and N of the coasts of E Libya and W Egypt.
Mediterranean Sea  search
NTEast Mediterranean
 Gulf of Pozzuoli
 Hellenic Trench
 Mediterranean Ridge
 Pelagian Sea
 Strait of Sicily
 West Mediterranean
RTMediterranean region
 Greek Aegean Islands
 Cyprus
 El Alboran Island
 Leg 13
 Leg 42A
 Balearic Islands
 Sardinia Italy
 Sicily Italy
 Greek Ionian Islands
 Strait of Gibraltar
 Corsica
 Crete
 Hellenic Arc
 Haifa Bay
 Malta
SNEnclosed by Europe on the W and N, Asia on the E, and Africa on the S. Before 1981, Balearic Islands and Malta were included as narrower terms.
Mediterranean soils  search
BTsoils
 .Mediterranean soils
RTsoil group
Medo  search
SNNot a valid term for GeoRef. See Tokyo Japan.
Medoc  search
BTEurope
 .Western Europe
 ..France
 ...Gironde France
 ....Medoc
SNDistrict between the Gironde River and the Bay of Biscay in NW Gironde, SW France.
Meeker County Minnesota  search
BTUnited States
 .Minnesota
 ..Meeker County Minnesota
Meerfeld crater lake  search
BTEurope
 .Central Europe
 ..Germany
 ...Rhineland-Palatinate Germany
 ....Meerfeld crater lake
SNW Germany. Added to Thesaurus in 1989.
Meers Fault  search
BTUnited States
 .Oklahoma
 ..Meers Fault
RTCaddo County Oklahoma
 Comanche County Oklahoma
 Kiowa County Oklahoma
SNSW Oklahoma. Indexed with counties as applicable. Added to Thesaurus in 1989.
meerschaum  search
USEsepiolite
Meerut India  search
BTAsia
 .Indian Peninsula
 ..India
 ...Uttar Pradesh India
 ....Meerut India
SNCity, district, and division in N India.
meetings  search
USEsymposia
megabreccia  search
BTsedimentary rocks
 .clastic rocks
 ..megabreccia
RTbreccia
 microbreccia
 volcanic breccia
 gravity sliding
 tectonic breccia
SNAdded to Thesaurus in 1995.
megacrysts  search
RTigneous rocks
 metamorphic rocks
 textures
 matrix
megacyclothems  search
BTsedimentary structures
 .planar bedding structures
 ..cyclothems
 ...megacyclothems
megafossils  search
USEfossils
Megalopolis Basin  search
BTEurope
 .Southern Europe
 ..Greece
 ...Peloponnesus Greece
 ....Megalopolis Basin
SNIn Arcadia Department in central Peloponnesus. Also search Megalopolis.
Megantic County Quebec  search
BTCanada
 .Eastern Canada
 ..Quebec
 ...Megantic County Quebec
megaripples  search
BTsedimentary structures
 .bedding plane irregularities
 ..megaripples
RTsand waves
 sand ridges
megaspores  search
BTpalynomorphs
 .megaspores
RTmicrofossils
 biostratigraphy
 miospores
 spores
Meghalaya India  search
BTAsia
 .Indian Peninsula
 ..India
 ...Northeastern India
 ....Meghalaya India
NTGaro Hills
 Shillong India
RTAssam India
 Shillong Plateau
SNState in NE India. Became a state in 1972. Formerly in Assam.
Megion Field  search
BTCommonwealth of Independent States
 .Russian Federation
 ..Megion Field
BTAsia
 .Megion Field
RToil and gas fields
 Siberian Lowland
SNOil field in SE Khanty-Mansi National Okrug in Siberian Lowland. Also search Megion. This term has multiple hierarchies.
Megri Armenia  search
BTEurope
 .Armenia
 ..Megri Armenia
SNTown in S Armenia near Iranian border. This term has multiple hierarchies.
Megrinskiy Pluton  search
BTEurope
 .Armenia
 ..Megrinskiy Pluton
SNIn Megrinskiy Mountains in S Armenia. This term has multiple hierarchies.
Meguma Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Ordovician
 ....Meguma Group
RTCanada
 Nova Scotia
 Goldenville Formation
 Halifax Formation
SNComposed of Goldenville and Halifax formations. In Nova Scotia.
Meguma Te  search
Meguma Terrane  search
BTCanada
 .Eastern Canada
 ..Meguma Terrane
RTAppalachians
 New Brunswick
 Nova Scotia
 Newfoundland
 Northern Appalachians
SNN Appalachians, E Maritime Provinces, Canada. Added to Thesaurus in 1995.
Mehadia Romania  search
BTEurope
 .Southern Europe
 ..Romania
 ...Mehadia Romania
BTEurope
 .Southern Europe
 ..Banat
 ...Mehadia Romania
SNVillage at W edge of the Transylvanian Alps. This term has multiple hierarchies.
Mehedinti Plateau  search
BTEurope
 .Southern Europe
 ..Romania
 ...Mehedinti Plateau
RTBanat
 Walachia
SNSW Romania. Indexed with regions as applicable.
Meighen Island  search
BTCanada
 .Northwest Territories
 ..Franklin District Northwest Territories
 ...Queen Elizabeth Islands
 ....Meighen Island
SNSverdrup Islands, W of Axel Heiberg Island in Franklin District.
Meigs County Ohio  search
BTUnited States
 .Ohio
 ..Meigs County Ohio
Meigs County Tennessee  search
BTUnited States
 .Tennessee
 ..Meigs County Tennessee
meimechite  search
BTigneous rocks
 .plutonic rocks
 ..ultramafics
 ...meimechite
UFmeymechite
meionite  search
BTcarbonates
 .meionite
BTsilicates
 .framework silicates
 ..scapolite group
 ...meionite
SNThis term has multiple hierarchies.
Mekong Delta  search
BTAsia
 .Far East
 ..Vietnam
 ...Mekong Delta
SNOn the South China Sea S of Saigon.
Melanesia  search
BTOceania
 .Melanesia
NTFiji
 New Caledonia
 Solomon Islands
 Vanuatu
RTEast Pacific Ocean Islands
 Pacific Ocean
 West Pacific Ocean Islands
 Bismarck Archipelago
SNCollective name for islands NE of Australia. Indexed with island groups as applicable.
melange  search
UFblock clay
RTplate tectonics
 structural analysis
 deformation
 boudinage
 tectonostratigraphic units
melanite  search
BTsilicates
 .orthosilicates
 ..nesosilicates
 ...garnet group
 ....melanite
melanocerite  search
BTsilicates
 .orthosilicates
 ..nesosilicates
 ...melanocerite
melanophlogite  search
BTsilicates
 .framework silicates
 ..silica minerals
 ...melanophlogite
melanterite  search
BTsulfates
 .melanterite
melaphyre  search
BTigneous rocks
 .volcanic rocks
 ..basalts
 ...melaphyre
RTporphyry
Melbourne Australia  search
BTAustralasia
 .Australia
 ..Victoria Australia
 ...Melbourne Australia
RTPort Phillip Bay
SNCity on N Port Phillip Bay, SE Australia at mouth of Yarra River. Before 1993, also search Melbourne region AND Australia.
Melbourne region  search
SNNo longer a valid term for GeoRef. See Melbourne Australia.
Melbourne, Mount  search
USEMount Melbourne
Meldon Aplite  search
BTEurope
 .Western Europe
 ..United Kingdom
 ...Great Britain
 ....England
 .....Northumberland England
 ......Meldon Aplite
SNNorthumberland in extreme NE England.
melilite  search
BTsilicates
 .orthosilicates
 ..sorosilicates
 ...melilite group
 ....melilite
UFmellilite
melilite group  search
BTsilicates
 .orthosilicates
 ..sorosilicates
 ...melilite group
NTakermanite
 gehlenite
 melilite
melilitite  search
BTigneous rocks
 .volcanic rocks
 ..melilitite
RTalkali basalts
 ultramafics
Melilla  search
BTAfrica
 .North Africa
 ..Melilla
RTSpain
 Morocco
 Ceuta
SNSpanish presidio on north coast of Morocco. Added to Thesaurus in 1981.
Mellette County South Dakota  search
BTUnited States
 .South Dakota
 ..Mellette County South Dakota
mellilite  search
USEmelilite
melnikovite  search
USEgreigite
Melones Fault  search
BTUnited States
 .California
 ..Melones Fault
RTSierra Nevada
SNMajor structural feature in the Sierra Nevada of California. Added to Thesaurus in 1981.
Melos  search
SNUse Milos for the Greek island.
Melosira  search
BTPlantae
 .algae
 ..diatoms
 ...Melosira
RTmicrofossils
SNIndexed with microfossils if applicable.
melt water  search
USEmeltwater
melteigite  search
BTigneous rocks
 .plutonic rocks
 ..gabbros
 ...alkali gabbros
 ....melteigite
RTijolite
 urtite
melting  search
RTphase equilibria
 magma transport
 fusion
 partial melting
melting relations  search
SNA valid term through mid-1978. Use melting or phase equilibria.
melts  search
NTsilicate melts
RTpetrology
 magmas
 phase equilibria
 liquid phase
 magmatic differentiation
 vitrification
 partial melting
meltwater  search
UFmelt water
RTglacial geology
 glaciers
 rain
 water
 hydrology
 snow
 jokulhlaups
 ice
Melville Island  search
RTCanada
 Australia
 Northern Territory Australia
 Queen Elizabeth Islands
 Franklin District Northwest Territories
 Northwest Territories
SNOne of the Queen Elizabeth Islands in W Franklin District, Northwest Territories. Also an island off the NW coast of Northern Territory, Australia. Indexed with regions as applicable. Added to Thesaurus in 1989.
Melville Peninsula  search
RTAntarctica
 Franklin District Northwest Territories
 South Shetland Islands
 King George Island
SNN projection of Canadian mainland in Franklin District between Committee Bay on the W and Foxe Basin on the E. Also on King George Island, South Shetland Islands, Antarctica. Indexed with King George Island and South Shetland Islands; OR Franklin District
Memel River basin  search
USENeman River basin
Memphis Tennessee  search
BTUnited States
 .Tennessee
 ..Shelby County Tennessee
 ...Memphis Tennessee
SNCity in SW Tennessee.
menaccanite  search
USEilmenite
Menard County Illinois  search
BTUnited States
 .Illinois
 ..Menard County Illinois
Menard County Texas  search
BTUnited States
 .Texas
 ..Menard County Texas
mendelevium  search
BTmetals
 .actinides
 ..mendelevium
UFMd
SNChemical element.
Mendeleyev Ridge  search
BTArctic Ocean
 .Mendeleyev Ridge
RTAlpha Cordillera
SNN of Alaska and E of Siberia.
Mendeleyev Volcano  search
BTCommonwealth of Independent States
 .Russian Federation
 ..Russian Pacific region
 ...Kuril Islands
 ....Kunashir Island
 .....Mendeleyev Volcano
UFMendeleyeva Volcano
RTvolcanoes
SNOn Kunashir Island, southernmost of the Kuril Islands. This term has multiple hierarchies.
Mendeleyeva Volcano  search
USEMendeleyev Volcano
Menderes Massif  search
BTAsia
 .Middle East
 ..Turkey
 ...Menderes Massif
RTAnatolia
SNSW Anatolia.
Mendip Hills  search
BTEurope
 .Western Europe
 ..United Kingdom
 ...Great Britain
 ....England
 .....Somerset England
 ......Mendip Hills
SNSW England. Also search Mendip.
Mendocino (Cape)  search
USECape Mendocino
Mendocino County California  search
BTUnited States
 .California
 ..Mendocino County California
NTPoint Arena California
RTEel River
 Point Arena
SNOn the Pacific Ocean in NW California.
Mendocino fracture zone  search
BTPacific Ocean
 .North Pacific
 ..Northeast Pacific
 ...Mendocino fracture zone
UFMendocino triple junction
RTtriple junctions
SNRunning in an E-W direction approximately 1250 miles W of N California. This term has multiple hierarchies.
Mendocino triple junction  search
USEMendocino fracture zone
Mendoza Argentina  search
BTSouth America
 .Argentina
 ..Mendoza Argentina
NTPayun Matru
UFMendoza Province
RTSalado Basin
SNProvince including city in W Argentina.
Mendoza Province  search
USEMendoza Argentina
Menefee Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Upper Cretaceous
 .....Menefee Formation
RTNew Mexico
 Colorado
 Mesaverde Group
SNIn Mesaverde Group. Includes Cleary Coal Member and above that a bed formerly called Allison Barren Member. SW Colorado, and NW New Mexico.
meneghinite  search
BTsulfosalts
 .sulfantimonites
 ..meneghinite
Menifee County Kentucky  search
BTUnited States
 .Kentucky
 ..Menifee County Kentucky
Menominee County Michigan  search
BTUnited States
 .Michigan
 ..Michigan Upper Peninsula
 ...Menominee County Michigan
Menominee County Wisconsin  search
BTUnited States
 .Wisconsin
 ..Menominee County Wisconsin
Menorca  search
USEMinorca
Menorca Rise  search
USEMinorca Rise
Mentor Beds  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Lower Cretaceous
 .....Mentor Beds
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Comanchean
 .....Mentor Beds
RTKansas
SNMentor Sandstone Member (or Belvedere Formation), Lower Cretaceous. In central Kansas. This term has multiple hierarchies.
Menuha Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Upper Cretaceous
 .....Menuha Formation
RTMiddle East
 Israel
 Jordan
 Syria
SNAdded to Thesaurus in 1989.
Meotian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Neogene
 ....Miocene
 .....upper Miocene
 ......Meotian
SNEuropean stage, Black Sea area. Above Sarmatian, below Cimmerian.
Meramecian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Mississippian
 .....Upper Mississippian
 ......Meramecian
NTSaint Louis Limestone
 Sainte Genevieve Limestone
 Salem Limestone
 Spergen Formation
 Warsaw Formation
RTChesterian
 Boone Formation
 Valmeyeran
SNProvincial series, North America. Above Osagian, below Chesterian.
Merano Italy  search
BTEurope
 .Southern Europe
 ..Italy
 ...Trentino-Alto Adige Italy
 ....Bolzano Italy
 .....Merano Italy
SNCity in Bolzano Province in NE Italy.
Merapi  search
BTAsia
 .Far East
 ..Indonesia
 ...Java
 ....Merapi
UFMerapi Volcano
RTvolcanoes
SNVolcano in Java, Indonesia. Added to Thesaurus in 1989.
Merapi Volcano  search
USEMerapi
Mercalli scale, modified  search
USEmodified Mercalli scale
Merced County California  search
BTUnited States
 .California
 ..Merced County California
RTKesterson Reservoir
SNCentral California.
Mercenaria  search
BTInvertebrata
 .Mollusca
 ..Bivalvia
 ...Mercenaria
SNGenus.
Mercer County Illinois  search
BTUnited States
 .Illinois
 ..Mercer County Illinois
SNNW Illinois.
Mercer County Kentucky  search
BTUnited States
 .Kentucky
 ..Mercer County Kentucky
SNCentral Kentucky.
Mercer County Missouri  search
BTUnited States
 .Missouri
 ..Mercer County Missouri
SNN Missouri.
Mercer County New Jersey  search
BTUnited States
 .New Jersey
 ..Mercer County New Jersey
NTPrinceton New Jersey
 Trenton New Jersey
SNW New Jersey.
Mercer County North Dakota  search
BTUnited States
 .North Dakota
 ..Mercer County North Dakota
SNCentral North Dakota.
Mercer County Ohio  search
BTUnited States
 .Ohio
 ..Mercer County Ohio
SNW Ohio.
Mercer County Pennsylvania  search
BTUnited States
 .Pennsylvania
 ..Mercer County Pennsylvania
SNNW Pennsylvania.
Mercer County West Virginia  search
BTUnited States
 .West Virginia
 ..Mercer County West Virginia
SNS West Virginia.
Mercia Mudstone  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Triassic
 ....Upper Triassic
 .....Mercia Mudstone
RTEngland
 Scotland
SNAdded to Thesaurus in 1989.
mercury  search
BTmetals
 .mercury
UFHg
 quicksilver
RTnative elements
 mercury ores
 Mercury Planet
 cinnabar
 methylmercury
SNChemical element. Use mercury ores for mercury as a commodity. Use Mercury Planet for the planet.
mercury injection  search
UFmercury injection method
RTpetroleum engineering
 tertiary recovery
 injection
 enhanced recovery
SNAdded to Thesaurus in 1985.
mercury injection method  search
USEmercury injection
mercury ores  search
BTmetal ores
 .mercury ores
RTnative elements
 Borkut Deposit
 Mercury Planet
 cinnabar
 mercury
SNCommodity. See List C.
Mercury Planet  search
NTCaloris Basin
RTplanetology
 planets
 solar system
 mercury ores
 mercury
 Mariner 10
 Mariner Program
 terrestrial planets
SNBefore 1972, also search Mercury in combination with the category (extraterrestrial geology (See list A).
Merensky Reef  search
BTAfrica
 .Southern Africa
 ..South Africa
 ...Merensky Reef
RTMpumalanga South Africa
 Transvaal region
 Bushveld Complex
 Guateng South Africa
 Northern Province South Africa
SNOre body, NE South Africa. Indexed with provinces. Added to Thesaurus in 1985.
Meric River  search
USEMaritsa River
Merida Mexico  search
BTMexico
 .Yucatan Mexico
 ..Merida Mexico
SNCity in Yucatan.
Merida Venezuela  search
BTSouth America
 .Venezuela
 ..Merida Venezuela
RTMaracaibo Basin
SNState in W Venezuela.
Merionethshire Wales  search
BTEurope
 .Western Europe
 ..United Kingdom
 ...Great Britain
 ....Wales
 .....Merionethshire Wales
NTArenig
 Harlech Wales
RTBala
 Tremadoc Bay
 Cardigan Bay
SNFormer county in W Wales. As of April 1974, part of Gwynedd. Before 1993, also search Merioneth.
Meriwether County Georgia  search
BTUnited States
 .Georgia
 ..Meriwether County Georgia
meromictic lakes  search
BTlakes
 .meromictic lakes
RTgeomorphology
 lacustrine environment
 lacustrine features
SNAlso index lacustrine features as applicable. Added to Thesaurus in 1989.
Merostomata  search
BTInvertebrata
 .Arthropoda
 ..Chelicerata
 ...Merostomata
NTEurypterida
 Xiphosura
Merrick County Nebraska  search
BTUnited States
 .Nebraska
 ..Merrick County Nebraska
merrillite  search
USEwhitlockite
Merrimack County New Hampshire  search
BTw Hampshire
 .Merrimack County New Hampshire
Merrimack Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Merrimack Group
RTOrdovician
 Silurian
 Massachusetts
 New Hampshire
 Maine
 Berwick Formation
 Kittery Formation
SNSW Maine, NE Massachusetts and SE New Hampshire. Includes Berwick Formation, Kittery Formation. Indexed with ages as applicable. Added to Thesaurus in 1989.
Merrimack River valley  search
BTUnited States
 .Merrimack River valley
RTMassachusetts
 New Hampshire
 Essex County Massachusetts
 Middlesex County Massachusetts
 Hillsborough County New Hampshire
SNIndexed with states and counties as applicable.
Merrimack Synclin  search
Merrimack Synclinorium  search
BTUnited States
 .Merrimack Synclinorium
RTMassachusetts
 New Hampshire
 Maine
SNIndexed with states as applicable.
Merseburg Germany  search
BTEurope
 .Central Europe
 ..Germany
 ...Saxony-Anhalt Germany
 ....Merseburg Germany
SNCity in E central Germany.
Mersey River  search
RTEngland
 Tasmania Australia
 Cheshire England
 Mersey Valley
SNName of rivers in N Tasmania and in NW England. Indexed with England or Tasmania Australia as applicable.
Mersey Valley  search
RTEngland
 Australia
 Tasmania Australia
 Cheshire England
 Mersey River
SNRiver valley in NW England and in Tasmania. Indexed with regions as applicable.
merwinite  search
BTsilicates
 .orthosilicates
 ..nesosilicates
 ...merwinite
merzlota  search
USEfrozen ground
Mesa County Colorado  search
BTUnited States
 .Colorado
 ..Mesa County Colorado
NTGrand Junction Colorado
RTBook Cliffs
SNW central Colorado.
Mesa Rica Sandstone  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Lower Cretaceous
 .....Mesa Rica Sandstone
RTNew Mexico
 Texas
 Dakota Formation
SNLower Cretaceous. May be in Purgatoire Formation or Dakota Formation. NE New Mexico and Texas. Added to Thesaurus in 1993.
Mesabi Range  search
BTUnited States
 .Minnesota
 ..Mesabi Range
RTBiwabik Iron Formation
 Saint Louis County Minnesota
 Itasca County Minnesota
SNIron-ore bearing range of low hills in NE Minnesota.
mesas  search
BTerosion features
 .mesas
RTgeomorphology
 mountains
 benches
 highlands
 plateaus
 uplands
 hills
SNAdded to Thesaurus in 1993.
Mesaverde Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Upper Cretaceous
 .....Mesaverde Group
RTNew Mexico
 Montana
 Colorado
 Almond Formation
 Arizona
 Blackhawk Formation
 Blair Formation
 Castlegate Sandstone
 Price River Formation
 Crevasse Canyon Formation
 ro
 Gallup Sandstone
 Hilliard Shale
 La Ventana Sandstone
 Menefee Formation
 Point Lookout Sandstone
SNThroughout San Juan Basin of SW Colorado and NW New Mexico, composed of Menefee Formation, Point Lookout Sandstone, Cliff House Sandstone, Gallup Sandstone, and Crevasse Canyon Formation. Arizona, W Colorado, S central Montana, W New Mexico, E Utah, and W
Meseta  search
RTSpain
 Morocco
SNGeographic term for tableland. Used in several locations. One is the entire interior of Spain covering almost 3/4 of country and consisting of an immense plateau with Madrid at its center. Also search Iberian Meseta if applicable. For Morocco, also search
Mesoarchean  search
BTChronostratigraphic Units
 .Precambrian
 ..Archean
 ...Mesoarchean
Mesogaea  search
RTMediterranean region
 Tethys
 paleogeography
 continental drift
Mesogastropoda  search
BTInvertebrata
 .Mollusca
 ..Gastropoda
 ...Mesogastropoda
NTCerithiidae
mesolite  search
BTsilicates
 .framework silicates
 ..zeolite group
 ...mesolite
Mesolithic  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Quarternary
 ....Holocene
 .....Mesolithic
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Stone Age
 ....Mesolithic
UFMiddle Stone Age
RTarchaeology
SNArchaeological classification. This term has multiple hierarchies.
Mesopotamia  search
BTAsia
 .Middle East
 ..Mesopotamia
RTIraq
 Syria
SNRegion in SW Asia between Tigris River and Euphrates River. Primarily in Iraq but partly in NE Syria. Indexed with countries as applicable.
Mesoproterozoic  search
BTChronostratigraphic Units
 .Precambrian
 ..Proterozoic
 ...Mesoproterozoic
NTCalymmian
 Ectasian
 Stenian
 Aldridge Formation
 Altyn Limestone
 Apache Group
 Belt Supergroup
 Bonner Formation
 Fordham Gneiss
 Freda Sandstone
 Helena Formation
 Helikian
 Laxfordian
 Missoula Group
 Mount Shields Formation
 Newland Limestone
 Ravalli Group
 Revett Quartzite
 Saint Regis Formation
 Shepard Formation
 Snowslip Formation
 Spokane Formation
 Wallace Formation
UFmiddle Proterozoic
RTAdelaidean
 Empire Formation
 Penokean Orogeny
SNEra. Ages range from 1600 Ma to 1000 Ma. This term was ratified by IUGS in 1990. It is used here synonymously with middle Proterozoic which ranges from 1600 Ma to 900 Ma.
Mesosauria  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Reptilia
 ....Anapsida
 .....Mesosauria
SNOrder.
mesosiderite  search
BTmeteorites
 .stony irons
 ..mesosiderite
NTVaca Muerta Meteorite
RTDalgaranga
SNUse grahamite for the bitumen. Added to Thesaurus in 1984.
mesostasis  search
RTmeteorites
 igneous rocks
 textures
 matrix
SNBefore 1998, also search matrix AND igneous rocks.
mesothermal processes  search
RTprocesses
 mineral deposits, genesis
SNAlso search mesothermal. Added to Thesaurus in 1981.
Mesozoic  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
NTTriassic
 Jurassic
 Cretaceous
 Antalya Complex
 Brunswick Formation
 Caracas Group
 Cimmerian Orogeny
 Condrey Mountain Schist
 Franciscan Complex
 Glen Canyon Group
 Great Valley Sequence
 Indosinian Orogeny
 Khorat Group
 Kunga Group
 lower Mesozoic
 Maiolica Limestone
 McHugh Complex
 middle Mesozoic
 Mist Mountain Formation
 Moenave Formation
 Navajo Sandstone
 Nevadan Orogeny
 Newark Supergroup
 Nicoya Complex
 Orocopia Schist
 Passaic Formation
 Pictou Group
 Pucara Group
 Serra Geral Formation
 Shimanto Group
 Statfjord Formation
 upper Mesozoic
 Yanshanian
RTPhanerozoic
 Nubian Sandstone
 Ionian Zone
 Alpine Orogeny
 Brianconnais Zone
 upper Gondwana System
 lower Gondwana System
 Catalina Schist
 Himalayan Orogeny
 Voltri Group
 New England Orogeny
 Riggins Group
SNFrom the end of the Paleozoic to the beginning of the Cenozoic.
mesozonal metamorphism  search
BTmetamorphism
 .mesozonal metamorphism
RThigh-grade metamorphism
SNAdded to Thesaurus in 1982.
Messel Germany  search
BTsse Germany
 .Messel Germany
SNFossil locality and village near Darmstadt.
Messina Italy  search
BTEurope
 .Southern Europe
 ..Italy
 ...Sicily Italy
 ....Messina Italy
SNCity and province in NE Sicily.
Messina Strait  search
USEStrait of Messina
Messinian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Neogene
 ....Miocene
 .....Messinian
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Neogene
 ....Miocene
 .....upper Miocene
 ......Messinian
meta-andesite  search
BTmetamorphic rocks
 .metaigneous rocks
 ..meta-andesite
UFmetaandesite
meta-anorthosite  search
BTmetamorphic rocks
 .metaigneous rocks
 ..meta-anorthosite
UFmetaanorthosite
RTanorthosite
SNAdded to Thesaurus in 1989.
meta-arkose  search
BTmetamorphic rocks
 .metasedimentary rocks
 ..meta-arkose
UFmetaarkose
RTarkose
meta-limestone  search
USEmetalimestone
meta-ophiolite  search
USEophiolite
meta-turbidite  search
USEturbidite
metaandesite  search
USEmeta-andesite
metaanorthosite  search
USEmeta-anorthosite
metaarkose  search
USEmeta-arkose
metabasalt  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metabasalt
UFmetabasalts
RTbasalts
metabasalts  search
USEmetabasalt
metabasite  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metabasite
metabentonite  search
RTminerals
 metamorphic rocks
 clay minerals
 bentonite
 K-bentonite
 metasedimentary rocks
SNMay be used as a rock and a mineral. Also index bentonite AND metasedimentary rocks; OR clay minerals as applicable.
metabolism  search
RTbiochemistry
 alteration
 bioaccumulation
 biodegradation
 bioavailability
 nutrition
 diet
 biogenic processes
 metabolites
 transformations
metabolites  search
RTpollution
 materials
 environmental geology
 pollutants
 metabolism
 biodegradation
 biogenic processes
 dechlorination
SNProducts of metabolism.
metachert  search
BTmetamorphic rocks
 .metasedimentary rocks
 ..metachert
RTchert
SNAdded to Thesaurus in 1985.
metacinnabar  search
BTsulfides
 .metacinnabar
UFmetacinnabarite
RTonofrite
metacinnabarite  search
USEmetacinnabar
metaconglomerate  search
BTmetamorphic rocks
 .metasedimentary rocks
 ..metaconglomerate
RTconglomerate
metadacite  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metadacite
RTdacites
 metavolcanic rocks
SNAdded to Thesaurus in 1985.
metadiabase  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metadiabase
UFmetadolerite
RTdiabase
metadiorite  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metadiorite
RTdiorites
metadolerite  search
USEmetadiabase
metagabbro  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metagabbro
RTgabbros
metagranite  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metagranite
RTgranites
metagraywacke  search
BTmetamorphic rocks
 .metasedimentary rocks
 ..metagraywacke
UFmetagreywacke
RTgraywacke
metagreywacke  search
USEmetagraywacke
metahalloysite  search
BTsilicates
 .sheet silicates
 ..clay minerals
 ...metahalloysite
RThalloysite
SNBefore 1982, also search halloysite.
metaigneous  search
SNA valid index term through 1977. After 1977, use metaigneous rocks.
metaigneous rocks  search
BTmetamorphic rocks
 .metaigneous rocks
NTmeta-andesite
 meta-anorthosite
 metabasalt
 metabasite
 metadacite
 metadiabase
 metadiorite
 metagabbro
 metagranite
 metakomatiite
 metaperidotite
 metapyroxenite
 metarhyolite
 metatuff
 serpentinite
RTigneous rocks
 rocks
SNBefore 1978, also search metaigneous.
metakaolin  search
UFmetakaolinite
RTclay minerals
 kaolin
metakaolinite  search
USEmetakaolin
metakomatiite  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metakomatiite
RTkomatiite
SNAdded to Thesaurus in 1993.
metal  search
SNNot a valid GeoRef index term after 1969. Used in subfiles E and B. Now use metals or metal ores as applicable.
metal ores  search
NTaluminum ores
 antimony ores
 arsenic ores
 base metals
 beryllium ores
 bismuth ores
 cadmium ores
 chromite ores
 cobalt ores
 copper ores
 gold ores
 iridium ores
 iron ores
 lead ores
 lead-zinc deposits
 lithium ores
 magnesium ores
 manganese ores
 mercury ores
 molybdenum ores
 nickel ores
 niobium ores
 osmium ores
 palladium ores
 platinum ores
 polymetallic ores
 pyrite ores
 rare earth deposits
 rhodium ores
 ruthenium ores
 silver ores
 strontium ores
 tantalum ores
 thorium ores
 tin ores
 titanium ores
 tungsten ores
 uranium ores
 vanadium ores
 zinc ores
UFmetallic minerals
RTannealing
 Alma mining district
 alpine-type deposits
 economic geology
 graphitization
 Clara Mine
 Fukazawa Mine
 Broken Hill Mine
 Bathurst mining district
 Bergslagen
 Boquira Mine
 Broken Hill
 Chichibu Mine
 diwa-type deposits
 gossan
 Fairbanks mining district
 Ha
SNCommodity. See List C.
metal oxides  search
SNAs of 1993, for mineralogical discussions use oxides AND metals. See also heavy metals and heavy minerals.
metalimestone  search
BTmetamorphic rocks
 .metasedimentary rocks
 ..metalimestone
UFmeta-limestone
RTlimestone
Metaline Falls Washington  search
BTUnited States
 .Washington
 ..Pend Oreille County Washington
 ...Metaline Falls Washington
SNTown in NE Washington.
Metaline Limestone  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Cambrian
 ....Middle Cambrian
 .....Metaline Limestone
RTWashington
SNNE Washington. Added to Thesaurus in 1985.
metallic meteorites  search
USEiron meteorites
metallic minerals  search
USEmetal ores
metallogenesis  search
USEmetallogeny
metallogenic epochs  search
RTmineral deposits, genesis
 metal ores
 economic geology
 mineralization
 metallogenic provinces
 metallogeny
SNAdded to Thesaurus in 1982.
metallogenic maps  search
BTmaps
 .metallogenic maps
RTmineral deposits, genesis
 metal ores
 economic geology maps
 metallogenic provinces
 metallogeny
SNAdded to Thesaurus in 1993.
metallogenic provinces  search
UFprovinces, metallogenic
RTmineral deposits, genesis
 metal ores
 economic geology
 Iberian pyrite belt
 mineralization
 metallogenic epochs
 metallogenic maps
 Quadrilatero Ferrifero
 Thompson nickel belt
 Viburnum Trend
SNSome specific mines and mining districts may be found as See Also references in mines.
metallogeny  search
UFmetallogenesis
RTgeosynclines
 mineral deposits, genesis
 metal ores
 economic geology
 mineralization
 metallotects
 metallogenic epochs
 metallogenic maps
metallography  search
SNNot a valid index term for GeoRef. See mineralogy and petrology.
metallotects  search
RTmineral deposits, genesis
 controls
 metallogeny
SNAny geologic feature which has influenced concentration of elements, resulting in formation of mineral deposits. Added to Thesaurus in 1989.
metallurgy  search
RTmetals
 alloys
 annealing
 metal ores
 hydrometallurgy
 smelters
metals  search
NTactinides
 alkali metals
 alkaline earth metals
 aluminum
 antimony
 arsenic
 bismuth
 cadmium
 chromium
 cobalt
 copper
 gallium
 germanium
 gold
 hafnium
 indium
 iron
 lead
 manganese
 mercury
 molybdenum
 nickel
 niobium
 platinum group
 polonium
 precious metals
 rare earths
 rhenium
 silver
 tantalum
 technetium
 thallium
 tin
 titanium
 tungsten
 vanadium
 zinc
 zirconium
RTpollution
 geochemistry
 isotopes
 critical load
 base metals
 alloys
 metallurgy
 native elements
 metal ores
 chelation
 ligands
 chemical elements
 geochemical cycle
 complexing
 nonmetals
 ore minerals
 trace metals
SNUse metal ores for metals as a commodity.
metaluminous composition  search
RTigneous rocks
 composition
 peralkalic composition
 peraluminous composition
SNAdded to Thesaurus in 1995.
metamict  search
SNNo longer a valid term for GeoRef as of 1981. Use metamict minerals.
metamict minerals  search
RTminerals
 crystal structure
 radiation damage
 metamictization
SNBefore 1981, search metamict. Added to Thesaurus in 1981.
metamictization  search
RTminerals
 crystal structure
 radiation damage
 metamict minerals
metamorphic aureoles  search
USEaureoles
metamorphic belts  search
NTgreenstone belts
 schist belts
UFbelts, metamorphic
RTplate tectonics
 terranes
 Barrovian-type deposits
 metamorphic core complexes
metamorphic core complexes  search
UFcore complexes
RTtectonics
 plate tectonics
 terranes
 metamorphic rocks
 metamorphic belts
 shear zones
 complexes
SNAdded to Thesaurus in 1985.
metamorphic differentiation  search
SNNot a valid index term for GeoRef. See migration of elements or zoning.
metamorphic grade  search
USEgrade
metamorphic petrology  search
SNNot a valid GeoRef index term after 1970. Used in subfile N. Now use petrology or metamorphic rocks as applicable.
Metamorphic Petrology (category)  search
SNIgneous and metamorphic petrology, GeoRef category code 05, is one of thirty categories used to classify documents in GeoRef. Each reference in GeoRef is assigned one or more categories. Categories can be used, in addition to Terms, to refine searches (Se
metamorphic processes  search
USEmetamorphism
metamorphic rocks  search
NTamphibolites
 cataclasites
 eclogite
 fulgurite
 garnetite
 gneisses
 gondite
 granulites
 hornfels
 itabirite
 marbles
 metaigneous rocks
 metaplutonic rocks
 metasedimentary rocks
 metasomatic rocks
 metavolcanic rocks
 migmatites
 mylonites
 phyllites
 phyllonites
 quartzites
 schists
 slates
 supracrustals
RTactinolite facies
 facies
 amphibolite facies
 epidote-amphibolite facies
 deformation
 banded structures
 basement
 basement tectonics
 blueschist facies
 calc-silicate composition
 chemical properties
 complexes
 crystalline rocks
 eclogite facies
 fabric
 fine-graine
metamorphic zone  search
USEaureoles
metamorphism  search
NTanchimetamorphism
 autometamorphism
 burial metamorphism
 catazonal metamorphism
 contact metamorphism
 dynamic metamorphism
 epizonal metamorphism
 glauconitization
 granitization
 high-grade metamorphism
 low-grade metamorphism
 mesozonal metamorphism
 migmatization
 phyllonitization
 polymetamorphism
 prograde metamorphism
 regional metamorphism
 retrograde metamorphism
 shock metamorphism
 thermal metamorphism
 ultrametamorphism
UFmetamorphic processes
RTgeochemistry
 geochronology
 diagenesis
 anatexis
 deformation
 folds
 aureoles
 Barrovian-type deposits
 foliation
 boudinage
 cataclasis
 complexes
 feldspathization
 gra
SNIndexed with with specific type of metamorphism [e.g. anchimetamorphism, autometamorphism, burial metamorphism, contact metamorphism, dynamic metamorphism, grade, polymetamorphism, prograde metamorphism, regional metamorphism, retrograde metamorphism, rhe
metapelite  search
BTmetamorphic rocks
 .metasedimentary rocks
 ..metapelite
metaperidotite  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metaperidotite
RTperidotites
metaplutonic rocks  search
BTmetamorphic rocks
 .metaplutonic rocks
RTrocks
 metamorphism
 plutonic rocks
SNBefore 1978, also search metamorphic rocks AND metaplutonic.
metapyroxenite  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metapyroxenite
RTpyroxenite
metarhyolite  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metarhyolite
RTrhyolites
metasandstone  search
BTmetamorphic rocks
 .metasedimentary rocks
 ..metasandstone
RTsandstone
metasedimentary  search
SNA valid index term through 1977. After 1977, use metasedimentary rocks.
metasedimentary rocks  search
BTmetamorphic rocks
 .metasedimentary rocks
NTkhondalite
 meta-arkose
 metachert
 metaconglomerate
 metagraywacke
 metalimestone
 metapelite
 metasandstone
 metasiltstone
 paragneiss
 shungite
RTsedimentary rocks
 rocks
 supracrustals
 K-bentonite
 metabentonite
 turbidite
SNBefore 1978, also search metasedimentary; metasediments.
metasediments  search
SNA valid term through 1974. Use metasedimentary rocks.
metasiltstone  search
BTmetamorphic rocks
 .metasedimentary rocks
 ..metasiltstone
RTsiltstone
metasomatic rocks  search
BTmetamorphic rocks
 .metasomatic rocks
NTfenite
 greisen
 propylite
 serpentinite
 skarn
 steatite
 tactite
 talc rock
UFmetasomatites
RTpetrology
 rocks
 metasomatism
 alteration
 restites
SNAs of 1978, term is used for any rock produced by replacement processes at constant volume with little disturbance of textural or structural features.
metasomatism  search
NTalbitization
 alunitization
 amphibolitization
 argillization
 chloritization
 feldspathization
 fenitization
 greisenization
 hydrothermal alteration
 kaolinization
 microclinization
 muscovitization
 palagonitization
 propylitization
 pyritization
 pyrometasomatism
 scapolitization
 sericitization
 serpentinization
 spilitization
 tourmalinization
 uralitization
 wall-rock alteration
 zeolitization
RTgeochemistry
 igneous rocks
 metamorphic rocks
 alteration
 carbonatization
 diagenesis
 metasomatic rocks
 metamorphism
 intrusions
 magma transport
 hydrothermal conditions
 dolomitization
 localization
 granitization
 lithogeochemistry
 enrichment
 fenite
 mineral depo
SNFor documents before 1976, also search replacement. Indexed with material and specific process where available.
metasomatites  search
USEmetasomatic rocks
metastibnite  search
BTsulfides
 .metastibnite
RTstibnite
Metatheria  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Mammalia
 ....Theria
 .....Metatheria
NTMarsupialia
metatuff  search
BTmetamorphic rocks
 .metaigneous rocks
 ..metatuff
RTtuff
metaturbidite  search
USEturbidite
metavolcanic  search
SNA valid term through 1977.
metavolcanic rocks  search
BTmetamorphic rocks
 .metavolcanic rocks
RTrocks
 volcanic rocks
 supracrustals
 metadacite
SNBefore 1978, also search metamorphic rocks AND metavolcanic.
Metazoa  search
RTmicrofossils
 Invertebrata
 Protista
SNUsed as a general fossil term. Also search individual phyla and groups. Indexed with microfossils if applicable.
Metcalfe County Kentucky  search
BTUnited States
 .Kentucky
 ..Metcalfe County Kentucky
meteor crate  search
Meteor Crater  search
BTUnited States
 .Arizona
 ..Coconino County Arizona
 ...Meteor Crater
UFBarringer Crater
 Canyon Diablo Crater
 Coon Butte
 Crater Mound
RTimpact features
 Canyon Diablo Meteorite
SNIn Canyon Diablo area of Coconino County, N central Arizona. Search in combination with Arizona. Added to Thesaurus in 1995.
meteor craters  search
BTimpact features
 .impact craters
 ..meteor craters
UFmeteorite crater
RTgeochronology
 tectonics
 meteorites
 geomorphology
 relative age
 breccia
 metamorphism
 deformation
 astroblemes
 craters
 bolides
 crater lakes
 cryptoexplosion features
 shatter cones
 resurfacing
 impacts
 shock metamorphism
SNUsed for impact craters formed by the falling of a large meteorite onto a surface.
meteoric iron  search
USEiron meteorites
meteoric water  search
RTground water
 water
 reservoir rocks
 connate waters
 pore water
 oil-water interface
SNAdded to Thesaurus in 1989.
meteorite crater  search
USEmeteor craters
meteorite flux  search
RTmeteorites
SNBefore 1981, search meteorites AND flux. Added to Thesaurus in 1981.
meteorites  search
NTAcfer Meteorites
 Allan Hills Meteorites
 Asuka Meteorites
 Belgica Meteorites
 Coldwater Meteorites
 Elephant Moraine Meteorites
 iron meteorites
 Lewis Cliff Meteorites
 MacAlpine Hills Meteorites
 micrometeorites
 Odessa Meteorite
 Queen Alexandra Range Meteorites
 stony irons
 stony meteorites
 Yamato Meteorites
UFcosmolites
 skystones
RTisotopes
 impact features
 extraterrestrial geology
 asteroids
 australite
 bolides
 fireballs
 calcium-aluminum inclusions
 chaoite
 lonsdaleite
 chondrules
 cohenite
 comets
 interplanetary dust
 impacts
 impactite
 maskelynite
 kamacite
 majorite
 mesostasis
 meteor crate
SNUsed for any meteoroid that has fallen to the Earth's surface in one piece or in fragments without being completely vaporized. Indexed with specific meteorite or group of meteorites if applicable.
meteoroids  search
RTmeteorites
 interplanetary space
 asteroids
 cosmic dust
 parent bodies
 planets
 meteors
meteorology  search
RTdiffusion
 particles
 geophysics
 convection
 aerosols
 air-sea interface
 atmosphere
 boundary interactions
 climate
 ions
 circulation
 atmospheric precipitation
 hydrologic cycle
 hydrology
 electromagnetic waves
 clouds
 droplets
 lightning
 hurricanes
 humidity
 raindro
SNPrimarily used for special indexes.
meteors  search
NTbolides
UFshooting star
RTplanetology
 meteorites
 interplanetary space
 meteoroids
 fireballs
 comets
methane  search
BTorganic compounds
 .hydrocarbons
 ..aliphatic hydrocarbons
 ...alkanes
 ....methane
RTmethanol
 coalbed methane
 natural gas
methanethiomethane  search
USEdimethyl sulfide
methanol  search
BTorganic compounds
 .alcohols
 ..methanol
UFmethyl alcohol
RTpollution
 pollutants
 biodegradation
 volatiles
 methane
 petroleum products
SNFor pollution studies, also index pollutants or water quality as applicable. Added to Thesaurus in 1995.
methodology  search
USEmethods
methods  search
UFmethodology
RTfission-track dating
 anvil cells
 applications
 geochemical methods
 beneficiation
 biogeochemical methods
 geobotanical methods
 downhole methods
 centrifuge methods
 citrate-bicarbonate-dithionite method
 educational resources
 geological methods
 geomorphological
SNThis term applies to theoretical and experimental studies, while the term techniques is used for discussion of samples.
methods#mathematical geology#mathematical methods#methods#numerical analysis#out  search
Methow Basin  search
BTNorth America
 .Methow Basin
RTWashington
 British Columbia
 Methow River valley
SNSedimentary basin extending from N Washington to SW British Columbia. Indexed with Washington and/or British Columbia as applicable. Added to Thesaurus in 1989.
Methow River valley  search
BTUnited States
 .Washington
 ..Okanogan County Washington
 ...Methow River valley
RTMethow Basin
SNOkanogan County on British Columbia border. Also search Methow River.
methoxychlor  search
USEDDT
methyl alcohol  search
USEmethanol
methyl mercury  search
USEmethylmercury
methyl sulfide  search
USEdimethyl sulfide
methylation  search
RTgeochemistry
 processes
 chemical reactions
methylmercury  search
UFmethyl mercury
RTfungicides
 pesticides
 pollutants
 toxic materials
 mercury
 organo-metallics
SNCHmethylmercury compounds. Fungicides, disinfectants.
Metohija Yugoslavia  search
BTEurope
 .Southern Europe
 ..Yugoslavia
 ...Serbia
 ....Kosovo-Metohija Yugoslavia
 .....Metohija Yugoslavia
SNDistrict in SW Serbia forming part of autonomous province of Kosovo-Metohija.
metolachlor  search
BTpesticides
 .herbicides
 ..metolachlor
RTagrochemicals
 pollutants
metribuzin  search
BTpesticides
 .herbicides
 ..triazines
 ...metribuzin
RTpollutants
 toxic materials
Meurthe-et-Moselle France  search
BTEurope
 .Western Europe
 ..France
 ...Meurthe-et-Moselle France
RTLorraine
 Laneuveville-devant-Nancy Boring
SNDepartment in NE France.
Meuse France  search
BTEurope
 .Western Europe
 ..France
 ...Meuse France
NTVerdun France
SNDepartment in NE France.
Meuse River  search
BTEurope
 .Western Europe
 ..Meuse River
UFMaas River
RTFrance
 Netherlands
 Belgium
SNRises in NE France, flows N across E Belgium and, as the Maas River, flows through the Netherlands entering the North Sea through its estuary, the Hollandsch Diep. Indexed with countries as applicable.
Meuse Valley  search
BTEurope
 .Western Europe
 ..Meuse Valley
UFMaas Valley
RTFrance
 Netherlands
 Belgium
SNRiver valley. Known as the Maas Valley in the Netherlands. Indexed with countries as applicable.
Mexicali Mexico  search
BTMexico
 .Baja California Norte Mexico
 ..Mexicali Mexico
Mexicali Valley  search
BTNorth America
 .Mexicali Valley
RTMexico
 Baja California
 California
 Imperial County California
 Imperial Valley
SNBaja California, NW Mexico and extends into Imperial Valley irrigation area, SE California. Indexed with regions as applicable. Added to Thesaurus in 1989.
Mexican neovolcanic belt  search
USEMexican volcanic belt
Mexican volcanic belt  search
BTMexico
 .Mexican volcanic belt
UFMexican neovolcanic belt
RTGuerrero Mexico
 Sierra Madre Occidental
 Colima
 Jalisco Mexico
 Colima Mexico
 Sierra Madre del Sur
 Michoacan Mexico
 Nayarit Mexico
 Puebla Mexico
 Oaxaca Mexico
SNSW Mexico. Indexed with states as applicable. Added to Thesaurus in 1989.
Mexico  search
NTBaja California
 Baja California Norte Mexico
 Baja California Sur Mexico
 Campeche Mexico
 Chiapas Mexico
 Chihuahua Mexico
 Coahuila Mexico
 Colima Mexico
 Colorado River delta
 Durango Mexico
 Guanajuato Mexico
 Guerrero Mexico
 Guerrero Terrane
 Hidalgo Mexico
 Jalisco Block
 Jalisco Mexico
 Mexican volcanic belt
 Mexico state
 Michoacan Mexico
 Michoacan-Guanajuato volcanic field
 Nayarit Mexico
 Nuevo Leon Mexico
 Oaxaca Mexico
 Pico de Orizaba
 Popocatepetl
 Puebla Mexico
 Quintana Roo Mexico
 Sabinas Basin
 San Luis Potosi Mexico
 Sierra Madre del Sur
 Sierra Madre Occidental
 Sierra Madre Oriental
 Sinaloa Mexico
 Sonora Mexico
 Tabasco Mexico
 Tamaulipas Mexico
 Valley of Mexico
 Veracruz Mexico
 Yucatan Mexico
 Zacatecas Mexico
 Zaragoza Mexico
RTAcapulco Meteorite
 Agua Blanca Fault
 Aguacate Group
 Alisitos Formation
 Allende Meteorite
 Altiplano
 Cerro Prieto Fault
 Buda Limestone
 California Current
 Chicxulub Crater
 co
Mexico Basin  search
SNNot a valid term for GeoRef. See Sigsbee Deep or Valley of Mexico.
Mexico City earthquake 1985  search
BTearthquakes
 .Mexico City earthquake 1985
UFMichoacan earthquake 1985
RTMexico
 Michoacan Mexico
SNMichoacan, Mexico. Before 1993, also search Mexico earthquake 1985. Added to Thesaurus in 1993.
Mexico City Mexico  search
BTMexico
 .Mexico state
 ..Federal District Mexico
 ...Mexico City Mexico
RTValley of Mexico
SNCentral Mexico. In Federal District Mexico.
Mexico D.F.  search
USEFederal District Mexico
Mexico state  search
BTMexico
 .Mexico state
NTFederal District Mexico
RTGuerrero Terrane
 Valley of Mexico
 Popocatepetl
SNState N, E and W of Federal District.
meymechite  search
USEmeimechite
Mezen River basin  search
BTCommonwealth of Independent States
 .Russian Federation
 ..Mezen River basin
BTEurope
 .Mezen River basin
RTArkhangelsk Russian Federation
 Komi Russian Federation
SNN central Arkhangelsk Oblast in NW European Russian Federation. Also search Mezen River. This term has multiple hierarchies.
Mezen Russian Federation  search
BTCommonwealth of Independent States
 .Russian Federation
 ..Arkhangelsk Russian Federation
 ...Mezen Russian Federation
SNTown on the Mezen River in Arkhangelsk Oblast in NW European Russian Federation. Before 1993, Mezen Russian Republic was also used. This term has multiple hierarchies.
Mezhrechye Belarus  search
BTEurope
 .Belarus
 ..Mezhrechye Belarus
SNVillage in W Belarus. This term has multiple hierarchies.