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Meade Basin
RT	Alaska
	Kansas
	Meade County Kansas
	Northern Alaska
SN	Located 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
BT	United States
	.Kansas
	..Meade County Kansas
RT	Meade Basin
SN	SW Kansas.

Meade County Kentucky
BT	United States
	.Kentucky
	..Meade County Kentucky
SN	NW Kentucky.

Meade County South Dakota
BT	United States
	.South Dakota
	..Meade County South Dakota
RT	Black Hills
	Whitewood Creek
SN	W central South Dakota.

Meade Peak Member
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Permian
	....Meade Peak Member
RT	Idaho
	Utah
	Wyoming
	Montana
	Phosphoria Formation
SN	Of Phosphoria Formation. E Idaho, SW Montana, E Utah and W Wyoming. Added to Thesaurus in 1989.

Meadow soils
BT	soils
	.Meadow soils
RT	soil group
	Intrazonal soils

Meager, Mount
USE	Mount Meager

Meagher County Montana
BT	United States
	.Montana
	..Meagher County Montana
RT	Big Belt Mountains
	Bridger Range
	Crazy Mountains Basin
SN	Central Montana.

meandering
USE	meanders

meanders
BT	fluvial features
	.meanders
UF	meandering
RT	geomorphology
	floodplains
	avulsion
	oxbow lakes
	rivers
	rivers and streams
	streams
	point bars
	sinuosity

measurement
UF	measurements
RT	accuracy
	precision
	geodesy
	conductivity
	satellite methods
	dosimetry
	heat flow
	geothermal gradient
	thermal conductivity
	measurement-while-drilling
	telemetry

measurement while drilling
USE	measurement-while-drilling

measurement-while-drilling
UF	measurement while drilling
RT	measurement
	well-logging
	methods
	drilling
	boreholes
	downhole methods
	sounding
	techniques
SN	Before 1993, also search MWD. Added to Thesaurus in 1993.

measurements
USE	measurement

Meath Ireland
BT	Europe
	.Western Europe
	..Ireland
	...Meath Ireland
SN	County on the Irish Sea in NE Ireland.

mechanical analysis
SN	Not a valid GeoRef index term after 1970. See mechanism; mechanics.

mechanical controls
RT	controls
	mineral deposits, genesis
SN	As of 1993, restricted to economic studies.

mechanical erosion
USE	abrasion

mechanical properties
RT	anisotropy
	brittleness
	compactness
	creep
	deformation
	ductile deformation
	durability
	elastic limit
	elastic properties
	elasticity
	engineering geology
	friction
	hardness
	hysteresis
	physical properties
	plasticity
	Poisson's ratio
	properties
	rigidity
	shear

mechanical weathering
BT	weathering
	.mechanical weathering
RT	insolation
	physical weathering
SN	Before 1978, also search weathering AND mechanical.

mechanics
RT	computer animation
	decollement
	faults
	flexural-slip
	folds
	land subsidence
	plate tectonics
	rock mechanics
	shear
	soil mechanics
	static corrections
	stick-slip

mechanism
UF	mechanisms
RT	focal mechanism
	flow mechanism

mechanisms
USE	mechanism

Mechelen Belgium
USE	Malines Belgium

Mechlin Belgium
USE	Malines Belgium

Mecklenburg
BT	Europe
	.Central Europe
	..Germany
	...Mecklenburg
RT	Barth Germany
	Mecklenburg-Western Pomerania Germany
SN	Region on the Baltic Sea in Mecklenburg-Western Pomerania, NE Germany. A former German state.

Mecklenburg County North Carolina
BT	United States
	.North Carolina
	..Mecklenburg County North Carolina
NT	Charlotte North Carolina
	Davidson North Carolina
SN	S North Carolina.

Mecklenburg County Virginia
BT	United States
	.Virginia
	..Mecklenburg County Virginia
SN	S Virginia.

Mecklenburg-Vorpommern Germany
USE	Mecklenburg-Western Pomerania Germany

Mecklenburg-Western Pomerania Germany
BT	Europe
	.Central Europe
	..Germany
	...Mecklenburg-Western Pomerania Germany
NT	Barth Germany
	Rugen Island
	Schwerin Germany
UF	Mecklenburg-Vorpommern Germany
RT	Mecklenburg
	North German Plain
	Oder Valley
	Pomerania
SN	State in NE Germany. Before 1993, also search Mecklenburg.

Mecoptera
BT	Invertebrata
	.Arthropoda
	..Mandibulata
	...Insecta
	....Pterygota
	.....Neoptera
	......Endopterygota
	.......Mecoptera
UF	Mecopteroida
SN	Order.

Mecopteroida
USE	Mecoptera

Mecosta County Michigan
BT	United States
	.Michigan
	..Michigan Lower Peninsula
	...Mecosta County Michigan

Mecsek Mountains
BT	ngary
	.Mecsek Mountains
UF	Baranya Mountains
SN	Near Croatian border in S Hungary. In Baranya. Also search Mecsek.

media
USE	materials

median masses
SN	As of 1981, no longer a valid term for GeoRef. See tectonics; orogenic belts.

Median Tectonic Line
BT	Asia
	.Far East
	..Japan
	...Median Tectonic Line
RT	tectonics
	plate tectonics
	Honshu
	Kyushu
	Shikoku
SN	Southwest Japan.

median valley
UF	valley, median
RT	rift zones
	rifting
	mid-ocean ridges
	Mid-Atlantic Ridge

medical geology
UF	health
RT	pollution
	environmental geology
	geology
	carcinogens
	human ecology
	forensic geology

medicinal waters
RT	mineral waters
	thermal waters
	water
	water quality
	water resources
SN	Added to Thesaurus in 1981.

Medicine Bow Mountains
BT	United States
	.U. S. Rocky Mountains
	..Medicine Bow Mountains
RT	Wyoming
	Colorado
	Front Range
	Mullen Creek-Nash Fork shear zone
SN	Range of the Rocky Mountains. This term has multiple hierarchies. Indexed with states as applicable.

Medicine Hat Alberta
BT	Canada
	.Western Canada
	..Alberta
	...Medicine Hat Alberta
SN	City in SE Alberta.

Medicine Lake
UF	Medicine Lake Volcano
RT	Montana
	California
	volcanoes
	South Dakota
	Siskiyou County California
	Medicine Lake Highland
	Sheridan County Montana
SN	Lake 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
BT	United States
	.California
	..Siskiyou County California
	...Medicine Lake Highland
RT	Medicine Lake
SN	Plateau surrounding Medicine Lake, N California. Added to Thesaurus in 1985.

Medicine Lake Volcano
USE	Medicine Lake

Medina County Ohio
BT	United States
	.Ohio
	..Medina County Ohio
SN	N Ohio.

Medina County Texas
BT	United States
	.Texas
	..Medina County Texas
RT	Edwards Aquifer
SN	SW Texas.

Medina Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Silurian
	....Lower Silurian
	.....Medina Formation
RT	Ontario
	Pennsylvania
	New York
	Michigan
	Grimsby Sandstone

Mediterranean (region)
USE	Mediterranean region

Mediterranean region
NT	Aegean Islands
	Balearic Islands
	Calabrian Arc
	El Alboran Island
	Ionian Islands
UF	Mediterranean (region)
RT	Italy
	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
SN	The 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
BT	Mediterranean Sea
	.Mediterranean Ridge
RT	East Mediterranean
	Leg 42A
	DSDP Site 377
	Leg 160
	ODP Site 969
	ODP Site 970
	ODP Site 971
	ODP Site 972
	ODP Site 973
SN	Extends S of Crete and N of the coasts of E Libya and W Egypt.

Mediterranean Sea
NT	East Mediterranean
	Gulf of Pozzuoli
	Hellenic Trench
	Mediterranean Ridge
	Pelagian Sea
	Strait of Sicily
	West Mediterranean
RT	Balearic Islands
	Corsica
	Crete
	Cyprus
	El Alboran Island
	Greek Aegean Islands
	Greek Ionian Islands
	Haifa Bay
	Hellenic Arc
	Leg 13
	Leg 42A
	Malta
	Mediterranean region
	Sardinia Italy
	Sicily Italy
	Strait of Gibraltar
SN	Enclosed 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
BT	soils
	.Mediterranean soils
RT	soil group

Medo
SN	Not a valid term for GeoRef. See Tokyo Japan.

Medoc
BT	Europe
	.Western Europe
	..France
	...Gironde France
	....Medoc
SN	District between the Gironde River and the Bay of Biscay in NW Gironde, SW France.

Meeker County Minnesota
BT	United States
	.Minnesota
	..Meeker County Minnesota

Meerfeld crater lake
BT	Europe
	.Central Europe
	..Germany
	...Rhineland-Palatinate Germany
	....Meerfeld crater lake
SN	W Germany. Added to Thesaurus in 1989.

Meers Fault
BT	United States
	.Oklahoma
	..Meers Fault
RT	Caddo County Oklahoma
	Comanche County Oklahoma
	Kiowa County Oklahoma
SN	SW Oklahoma. Indexed with counties as applicable. Added to Thesaurus in 1989.

meerschaum
USE	sepiolite

Meerut India
BT	Asia
	.Indian Peninsula
	..India
	...Uttar Pradesh India
	....Meerut India
SN	City, district, and division in N India.

meetings
USE	symposia

megabreccia
BT	sedimentary rocks
	.clastic rocks
	..megabreccia
RT	breccia
	microbreccia
	volcanic breccia
	gravity sliding
	tectonic breccia
SN	Added to Thesaurus in 1995.

megacrysts
RT	igneous rocks
	matrix
	metamorphic rocks
	textures

megacyclothems
BT	sedimentary structures
	.planar bedding structures
	..cyclothems
	...megacyclothems

megafossils
USE	fossils

Megalopolis Basin
BT	Europe
	.Southern Europe
	..Greece
	...Peloponnesus Greece
	....Megalopolis Basin
SN	In Arcadia Department in central Peloponnesus. Also search Megalopolis.

Megantic County Quebec
BT	Canada
	.Eastern Canada
	..Quebec
	...Megantic County Quebec

megaripples
BT	sedimentary structures
	.bedding plane irregularities
	..megaripples
RT	sand waves
	sand ridges

megaspores
BT	palynomorphs
	.megaspores
RT	microfossils
	biostratigraphy
	miospores
	spores

Meghalaya India
BT	Asia
	.Indian Peninsula
	..India
	...Northeastern India
	....Meghalaya India
NT	Garo Hills
	Shillong India
RT	Assam India
	Shillong Plateau
SN	State in NE India. Became a state in 1972. Formerly in Assam.

Megion Field
BT	Commonwealth of Independent States
	.Russian Federation
	..Megion Field
BT	Asia
	.Megion Field
RT	oil and gas fields
	Siberian Lowland
SN	Oil field in SE Khanty-Mansi National Okrug in Siberian Lowland. Also search Megion. This term has multiple hierarchies.

Megri Armenia
BT	Europe
	.Armenia
	..Megri Armenia
SN	Town in S Armenia near Iranian border. This term has multiple hierarchies.

Megrinskiy Pluton
BT	Europe
	.Armenia
	..Megrinskiy Pluton
SN	In Megrinskiy Mountains in S Armenia. This term has multiple hierarchies.

Meguma Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Ordovician
	....Meguma Group
RT	Canada
	Nova Scotia
	Goldenville Formation
	Halifax Formation
SN	Composed of Goldenville and Halifax formations. In Nova Scotia.

Meguma Te

Meguma Terrane
BT	Canada
	.Eastern Canada
	..Meguma Terrane
RT	Appalachians
	New Brunswick
	Nova Scotia
	Newfoundland
	Northern Appalachians
SN	N Appalachians, E Maritime Provinces, Canada. Added to Thesaurus in 1995.

Mehadia Romania
BT	Europe
	.Southern Europe
	..Banat
	...Mehadia Romania
BT	Europe
	.Southern Europe
	..Romania
	...Mehadia Romania
SN	Village at W edge of the Transylvanian Alps. This term has multiple hierarchies.

Mehedinti Plateau
BT	Europe
	.Southern Europe
	..Romania
	...Mehedinti Plateau
RT	Banat
	Walachia
SN	SW Romania. Indexed with regions as applicable.

Meighen Island
BT	Canada
	.Northwest Territories
	..Franklin District Northwest Territories
	...Queen Elizabeth Islands
	....Meighen Island
SN	Sverdrup Islands, W of Axel Heiberg Island in Franklin District.

Meigs County Ohio
BT	United States
	.Ohio
	..Meigs County Ohio

Meigs County Tennessee
BT	United States
	.Tennessee
	..Meigs County Tennessee

meimechite
BT	igneous rocks
	.plutonic rocks
	..ultramafics
	...meimechite
UF	meymechite

meionite
BT	carbonates
	.meionite
BT	silicates
	.framework silicates
	..scapolite group
	...meionite
SN	This term has multiple hierarchies.

Mekong Delta
BT	Asia
	.Far East
	..Vietnam
	...Mekong Delta
SN	On the South China Sea S of Saigon.

Melanesia
BT	Oceania
	.Melanesia
NT	Fiji
	New Caledonia
	Solomon Islands
	Vanuatu
RT	East Pacific Ocean Islands
	Pacific Ocean
	West Pacific Ocean Islands
	Bismarck Archipelago
SN	Collective name for islands NE of Australia. Indexed with island groups as applicable.

melange
UF	block clay
RT	plate tectonics
	structural analysis
	deformation
	boudinage
	tectonostratigraphic units

melanite
BT	silicates
	.orthosilicates
	..nesosilicates
	...garnet group
	....melanite

melanocerite
BT	silicates
	.orthosilicates
	..nesosilicates
	...melanocerite

melanophlogite
BT	silicates
	.framework silicates
	..silica minerals
	...melanophlogite

melanterite
BT	sulfates
	.melanterite

melaphyre
BT	igneous rocks
	.volcanic rocks
	..basalts
	...melaphyre
RT	porphyry

Melbourne Australia
BT	Australasia
	.Australia
	..Victoria Australia
	...Melbourne Australia
RT	Port Phillip Bay
SN	City on N Port Phillip Bay, SE Australia at mouth of Yarra River. Before 1993, also search Melbourne region AND Australia.

Melbourne region
SN	No longer a valid term for GeoRef. See Melbourne Australia.

Melbourne, Mount
USE	Mount Melbourne

Meldon Aplite
BT	Europe
	.Western Europe
	..United Kingdom
	...Great Britain
	....England
	.....Northumberland England
	......Meldon Aplite
SN	Northumberland in extreme NE England.

melilite
BT	silicates
	.orthosilicates
	..sorosilicates
	...melilite group
	....melilite
UF	mellilite

melilite group
BT	silicates
	.orthosilicates
	..sorosilicates
	...melilite group
NT	akermanite
	gehlenite
	melilite

melilitite
BT	igneous rocks
	.volcanic rocks
	..melilitite
RT	alkali basalts
	ultramafics

Melilla
BT	Africa
	.North Africa
	..Melilla
RT	Spain
	Morocco
	Ceuta
SN	Spanish presidio on north coast of Morocco. Added to Thesaurus in 1981.

Mellette County South Dakota
BT	United States
	.South Dakota
	..Mellette County South Dakota

mellilite
USE	melilite

melnikovite
USE	greigite

Melones Fault
BT	United States
	.California
	..Melones Fault
RT	Sierra Nevada
SN	Major structural feature in the Sierra Nevada of California. Added to Thesaurus in 1981.

Melos
SN	Use Milos for the Greek island.

Melosira
BT	Plantae
	.algae
	..diatoms
	...Melosira
RT	microfossils
SN	Indexed with microfossils if applicable.

melt water
USE	meltwater

melteigite
BT	igneous rocks
	.plutonic rocks
	..gabbros
	...alkali gabbros
	....melteigite
RT	ijolite
	urtite

melting
RT	fusion
	magma transport
	partial melting
	phase equilibria

melting relations
SN	A valid term through mid-1978. Use melting or phase equilibria.

melts
NT	silicate melts
RT	liquid phase
	magmas
	magmatic differentiation
	partial melting
	petrology
	phase equilibria
	vitrification

meltwater
UF	melt water
RT	glacial geology
	glaciers
	rain
	water
	hydrology
	snow
	jokulhlaups
	ice

Melville Island
RT	Australia
	Canada
	Franklin District Northwest Territories
	Northern Territory Australia
	Northwest Territories
	Queen Elizabeth Islands
SN	One 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
RT	Antarctica
	Franklin District Northwest Territories
	King George Island
	South Shetland Islands
SN	N 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
USE	Neman River basin

Memphis Tennessee
BT	United States
	.Tennessee
	..Shelby County Tennessee
	...Memphis Tennessee
SN	City in SW Tennessee.

menaccanite
USE	ilmenite

Menard County Illinois
BT	United States
	.Illinois
	..Menard County Illinois

Menard County Texas
BT	United States
	.Texas
	..Menard County Texas

mendelevium
BT	metals
	.actinides
	..mendelevium
UF	Md
SN	Chemical element.

Mendeleyev Ridge
BT	Arctic Ocean
	.Mendeleyev Ridge
RT	Alpha Cordillera
SN	N of Alaska and E of Siberia.

Mendeleyev Volcano
BT	Commonwealth of Independent States
	.Russian Federation
	..Russian Pacific region
	...Kuril Islands
	....Kunashir Island
	.....Mendeleyev Volcano
UF	Mendeleyeva Volcano
RT	volcanoes
SN	On Kunashir Island, southernmost of the Kuril Islands. This term has multiple hierarchies.

Mendeleyeva Volcano
USE	Mendeleyev Volcano

Menderes Massif
BT	Asia
	.Middle East
	..Turkey
	...Menderes Massif
RT	Anatolia
SN	SW Anatolia.

Mendip Hills
BT	Europe
	.Western Europe
	..United Kingdom
	...Great Britain
	....England
	.....Somerset England
	......Mendip Hills
SN	SW England. Also search Mendip.

Mendocino (Cape)
USE	Cape Mendocino

Mendocino County California
BT	United States
	.California
	..Mendocino County California
NT	Point Arena California
RT	Eel River
	Point Arena
SN	On the Pacific Ocean in NW California.

Mendocino fracture zone
BT	Pacific Ocean
	.North Pacific
	..Northeast Pacific
	...Mendocino fracture zone
UF	Mendocino triple junction
RT	triple junctions
SN	Running in an E-W direction approximately 1250 miles W of N California. This term has multiple hierarchies.

Mendocino triple junction
USE	Mendocino fracture zone

Mendoza Argentina
BT	South America
	.Argentina
	..Mendoza Argentina
NT	Payun Matru
UF	Mendoza Province
RT	Salado Basin
SN	Province including city in W Argentina.

Mendoza Province
USE	Mendoza Argentina

Menefee Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Menefee Formation
RT	New Mexico
	Colorado
	Mesaverde Group
SN	In Mesaverde Group. Includes Cleary Coal Member and above that a bed formerly called Allison Barren Member. SW Colorado, and NW New Mexico.

meneghinite
BT	sulfosalts
	.sulfantimonites
	..meneghinite

Menifee County Kentucky
BT	United States
	.Kentucky
	..Menifee County Kentucky

Menominee County Michigan
BT	United States
	.Michigan
	..Michigan Upper Peninsula
	...Menominee County Michigan

Menominee County Wisconsin
BT	United States
	.Wisconsin
	..Menominee County Wisconsin

Menorca
USE	Minorca

Menorca Rise
USE	Minorca Rise

Mentor Beds
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Lower Cretaceous
	.....Mentor Beds
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Comanchean
	.....Mentor Beds
RT	Kansas
SN	Mentor Sandstone Member (or Belvedere Formation), Lower Cretaceous. In central Kansas. This term has multiple hierarchies.

Menuha Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Menuha Formation
RT	Middle East
	Israel
	Jordan
	Syria
SN	Added to Thesaurus in 1989.

Meotian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Neogene
	....Miocene
	.....upper Miocene
	......Meotian
SN	European stage, Black Sea area. Above Sarmatian, below Cimmerian.

Meramecian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Carboniferous
	....Mississippian
	.....Upper Mississippian
	......Meramecian
NT	Saint Louis Limestone
	Sainte Genevieve Limestone
	Salem Limestone
	Spergen Formation
	Warsaw Formation
RT	Chesterian
	Boone Formation
	Valmeyeran
SN	Provincial series, North America. Above Osagian, below Chesterian.

Merano Italy
BT	Europe
	.Southern Europe
	..Italy
	...Trentino-Alto Adige Italy
	....Bolzano Italy
	.....Merano Italy
SN	City in Bolzano Province in NE Italy.

Merapi
BT	Asia
	.Far East
	..Indonesia
	...Java
	....Merapi
UF	Merapi Volcano
RT	volcanoes
SN	Volcano in Java, Indonesia. Added to Thesaurus in 1989.

Merapi Volcano
USE	Merapi

Mercalli scale, modified
USE	modified Mercalli scale

Merced County California
BT	United States
	.California
	..Merced County California
RT	Kesterson Reservoir
SN	Central California.

Mercenaria
BT	Invertebrata
	.Mollusca
	..Bivalvia
	...Mercenaria
SN	Genus.

Mercer County Illinois
BT	United States
	.Illinois
	..Mercer County Illinois
SN	NW Illinois.

Mercer County Kentucky
BT	United States
	.Kentucky
	..Mercer County Kentucky
SN	Central Kentucky.

Mercer County Missouri
BT	United States
	.Missouri
	..Mercer County Missouri
SN	N Missouri.

Mercer County New Jersey
BT	United States
	.New Jersey
	..Mercer County New Jersey
NT	Princeton New Jersey
	Trenton New Jersey
SN	W New Jersey.

Mercer County North Dakota
BT	United States
	.North Dakota
	..Mercer County North Dakota
SN	Central North Dakota.

Mercer County Ohio
BT	United States
	.Ohio
	..Mercer County Ohio
SN	W Ohio.

Mercer County Pennsylvania
BT	United States
	.Pennsylvania
	..Mercer County Pennsylvania
SN	NW Pennsylvania.

Mercer County West Virginia
BT	United States
	.West Virginia
	..Mercer County West Virginia
SN	S West Virginia.

Mercia Mudstone
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Triassic
	....Upper Triassic
	.....Mercia Mudstone
RT	England
	Scotland
SN	Added to Thesaurus in 1989.

mercury
BT	metals
	.mercury
UF	Hg
	quicksilver
RT	native elements
	mercury ores
	Mercury Planet
	cinnabar
	methylmercury
SN	Chemical element. Use mercury ores for mercury as a commodity. Use Mercury Planet for the planet.

mercury injection
UF	mercury injection method
RT	petroleum engineering
	tertiary recovery
	injection
	enhanced recovery
SN	Added to Thesaurus in 1985.

mercury injection method
USE	mercury injection

mercury ores
BT	metal ores
	.mercury ores
RT	native elements
	Borkut Deposit
	Mercury Planet
	cinnabar
	mercury
SN	Commodity. See List C.

Mercury Planet
NT	Caloris Basin
RT	Mariner 10
	Mariner Program
	mercury
	mercury ores
	planetology
	planets
	solar system
	terrestrial planets
SN	Before 1972, also search Mercury in combination with the category (extraterrestrial geology (See list A).

Merensky Reef
BT	Africa
	.Southern Africa
	..South Africa
	...Merensky Reef
RT	Mpumalanga South Africa
	Transvaal region
	Bushveld Complex
	Guateng South Africa
	Northern Province South Africa
SN	Ore body, NE South Africa. Indexed with provinces. Added to Thesaurus in 1985.

Meric River
USE	Maritsa River

Merida Mexico
BT	Mexico
	.Yucatan Mexico
	..Merida Mexico
SN	City in Yucatan.

Merida Venezuela
BT	South America
	.Venezuela
	..Merida Venezuela
RT	Maracaibo Basin
SN	State in W Venezuela.

Merionethshire Wales
BT	Europe
	.Western Europe
	..United Kingdom
	...Great Britain
	....Wales
	.....Merionethshire Wales
NT	Arenig
	Harlech Wales
RT	Bala
	Tremadoc Bay
	Cardigan Bay
SN	Former county in W Wales. As of April 1974, part of Gwynedd. Before 1993, also search Merioneth.

Meriwether County Georgia
BT	United States
	.Georgia
	..Meriwether County Georgia

meromictic lakes
BT	lakes
	.meromictic lakes
RT	geomorphology
	lacustrine environment
	lacustrine features
SN	Also index lacustrine features as applicable. Added to Thesaurus in 1989.

Merostomata
BT	Invertebrata
	.Arthropoda
	..Chelicerata
	...Merostomata
NT	Eurypterida
	Xiphosura

Merrick County Nebraska
BT	United States
	.Nebraska
	..Merrick County Nebraska

merrillite
USE	whitlockite

Merrimack County New Hampshire
BT	w Hampshire
	.Merrimack County New Hampshire

Merrimack Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Merrimack Group
RT	Ordovician
	Silurian
	Massachusetts
	New Hampshire
	Maine
	Berwick Formation
	Kittery Formation
SN	SW 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
BT	United States
	.Merrimack River valley
RT	Massachusetts
	New Hampshire
	Essex County Massachusetts
	Middlesex County Massachusetts
	Hillsborough County New Hampshire
SN	Indexed with states and counties as applicable.

Merrimack Synclin

Merrimack Synclinorium
BT	United States
	.Merrimack Synclinorium
RT	Massachusetts
	New Hampshire
	Maine
SN	Indexed with states as applicable.

Merseburg Germany
BT	Europe
	.Central Europe
	..Germany
	...Saxony-Anhalt Germany
	....Merseburg Germany
SN	City in E central Germany.

Mersey River
RT	Cheshire England
	England
	Mersey Valley
	Tasmania Australia
SN	Name of rivers in N Tasmania and in NW England. Indexed with England or Tasmania Australia as applicable.

Mersey Valley
RT	Australia
	Cheshire England
	England
	Mersey River
	Tasmania Australia
SN	River valley in NW England and in Tasmania. Indexed with regions as applicable.

merwinite
BT	silicates
	.orthosilicates
	..nesosilicates
	...merwinite

merzlota
USE	frozen ground

Mesa County Colorado
BT	United States
	.Colorado
	..Mesa County Colorado
NT	Grand Junction Colorado
RT	Book Cliffs
SN	W central Colorado.

Mesa Rica Sandstone
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Lower Cretaceous
	.....Mesa Rica Sandstone
RT	New Mexico
	Texas
	Dakota Formation
SN	Lower Cretaceous. May be in Purgatoire Formation or Dakota Formation. NE New Mexico and Texas. Added to Thesaurus in 1993.

Mesabi Range
BT	United States
	.Minnesota
	..Mesabi Range
RT	Biwabik Iron Formation
	Saint Louis County Minnesota
	Itasca County Minnesota
SN	Iron-ore bearing range of low hills in NE Minnesota.

mesas
BT	erosion features
	.mesas
RT	geomorphology
	mountains
	benches
	highlands
	plateaus
	uplands
	hills
SN	Added to Thesaurus in 1993.

Mesaverde Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Mesaverde Group
RT	New 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
SN	Throughout 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
RT	Morocco
	Spain
SN	Geographic 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
BT	Chronostratigraphic Units
	.Precambrian
	..Archean
	...Mesoarchean

Mesogaea
RT	continental drift
	Mediterranean region
	paleogeography
	Tethys

Mesogastropoda
BT	Invertebrata
	.Mollusca
	..Gastropoda
	...Mesogastropoda
NT	Cerithiidae

mesolite
BT	silicates
	.framework silicates
	..zeolite group
	...mesolite

Mesolithic
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Quarternary
	....Holocene
	.....Mesolithic
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Stone Age
	....Mesolithic
UF	Middle Stone Age
RT	archaeology
SN	Archaeological classification. This term has multiple hierarchies.

Mesopotamia
BT	Asia
	.Middle East
	..Mesopotamia
RT	Iraq
	Syria
SN	Region in SW Asia between Tigris River and Euphrates River. Primarily in Iraq but partly in NE Syria. Indexed with countries as applicable.

Mesoproterozoic
BT	Chronostratigraphic Units
	.Precambrian
	..Proterozoic
	...Mesoproterozoic
NT	Calymmian
	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
UF	middle Proterozoic
RT	Adelaidean
	Empire Formation
	Penokean Orogeny
SN	Era. 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
BT	Chordata
	.Vertebrata
	..Tetrapoda
	...Reptilia
	....Anapsida
	.....Mesosauria
SN	Order.

mesosiderite
BT	meteorites
	.stony irons
	..mesosiderite
NT	Vaca Muerta Meteorite
RT	Dalgaranga
SN	Use grahamite for the bitumen. Added to Thesaurus in 1984.

mesostasis
RT	igneous rocks
	matrix
	meteorites
	textures
SN	Before 1998, also search matrix AND igneous rocks.

mesothermal processes
RT	mineral deposits, genesis
	processes
SN	Also search mesothermal. Added to Thesaurus in 1981.

Mesozoic
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
NT	Triassic
	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
RT	Phanerozoic
	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
SN	From the end of the Paleozoic to the beginning of the Cenozoic.

mesozonal metamorphism
BT	metamorphism
	.mesozonal metamorphism
RT	high-grade metamorphism
SN	Added to Thesaurus in 1982.

Messel Germany
BT	sse Germany
	.Messel Germany
SN	Fossil locality and village near Darmstadt.

Messina Italy
BT	Europe
	.Southern Europe
	..Italy
	...Sicily Italy
	....Messina Italy
SN	City and province in NE Sicily.

Messina Strait
USE	Strait of Messina

Messinian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Neogene
	....Miocene
	.....Messinian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Neogene
	....Miocene
	.....upper Miocene
	......Messinian

meta-andesite
BT	metamorphic rocks
	.metaigneous rocks
	..meta-andesite
UF	metaandesite

meta-anorthosite
BT	metamorphic rocks
	.metaigneous rocks
	..meta-anorthosite
UF	metaanorthosite
RT	anorthosite
SN	Added to Thesaurus in 1989.

meta-arkose
BT	metamorphic rocks
	.metasedimentary rocks
	..meta-arkose
UF	metaarkose
RT	arkose

meta-limestone
USE	metalimestone

meta-ophiolite
USE	ophiolite

meta-turbidite
USE	turbidite

metaandesite
USE	meta-andesite

metaanorthosite
USE	meta-anorthosite

metaarkose
USE	meta-arkose

metabasalt
BT	metamorphic rocks
	.metaigneous rocks
	..metabasalt
UF	metabasalts
RT	basalts

metabasalts
USE	metabasalt

metabasite
BT	metamorphic rocks
	.metaigneous rocks
	..metabasite

metabentonite
RT	bentonite
	clay minerals
	K-bentonite
	metamorphic rocks
	metasedimentary rocks
	minerals
SN	May be used as a rock and a mineral. Also index bentonite AND metasedimentary rocks; OR clay minerals as applicable.

metabolism
RT	alteration
	bioaccumulation
	bioavailability
	biochemistry
	biodegradation
	biogenic processes
	diet
	metabolites
	nutrition
	transformations

metabolites
RT	biodegradation
	biogenic processes
	dechlorination
	environmental geology
	materials
	metabolism
	pollutants
	pollution
SN	Products of metabolism.

metachert
BT	metamorphic rocks
	.metasedimentary rocks
	..metachert
RT	chert
SN	Added to Thesaurus in 1985.

metacinnabar
BT	sulfides
	.metacinnabar
UF	metacinnabarite
RT	onofrite

metacinnabarite
USE	metacinnabar

metaconglomerate
BT	metamorphic rocks
	.metasedimentary rocks
	..metaconglomerate
RT	conglomerate

metadacite
BT	metamorphic rocks
	.metaigneous rocks
	..metadacite
RT	dacites
	metavolcanic rocks
SN	Added to Thesaurus in 1985.

metadiabase
BT	metamorphic rocks
	.metaigneous rocks
	..metadiabase
UF	metadolerite
RT	diabase

metadiorite
BT	metamorphic rocks
	.metaigneous rocks
	..metadiorite
RT	diorites

metadolerite
USE	metadiabase

metagabbro
BT	metamorphic rocks
	.metaigneous rocks
	..metagabbro
RT	gabbros

metagranite
BT	metamorphic rocks
	.metaigneous rocks
	..metagranite
RT	granites

metagraywacke
BT	metamorphic rocks
	.metasedimentary rocks
	..metagraywacke
UF	metagreywacke
RT	graywacke

metagreywacke
USE	metagraywacke

metahalloysite
BT	silicates
	.sheet silicates
	..clay minerals
	...metahalloysite
RT	halloysite
SN	Before 1982, also search halloysite.

metaigneous
SN	A valid index term through 1977. After 1977, use metaigneous rocks.

metaigneous rocks
BT	metamorphic rocks
	.metaigneous rocks
NT	meta-andesite
	meta-anorthosite
	metabasalt
	metabasite
	metadacite
	metadiabase
	metadiorite
	metagabbro
	metagranite
	metakomatiite
	metaperidotite
	metapyroxenite
	metarhyolite
	metatuff
	serpentinite
RT	igneous rocks
	rocks
SN	Before 1978, also search metaigneous.

metakaolin
UF	metakaolinite
RT	clay minerals
	kaolin

metakaolinite
USE	metakaolin

metakomatiite
BT	metamorphic rocks
	.metaigneous rocks
	..metakomatiite
RT	komatiite
SN	Added to Thesaurus in 1993.

metal
SN	Not a valid GeoRef index term after 1969. Used in subfiles E and B. Now use metals or metal ores as applicable.

metal ores
NT	aluminum 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
UF	metallic minerals
RT	annealing
	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
SN	Commodity. See List C.

metal oxides
SN	As of 1993, for mineralogical discussions use oxides AND metals. See also heavy metals and heavy minerals.

metalimestone
BT	metamorphic rocks
	.metasedimentary rocks
	..metalimestone
UF	meta-limestone
RT	limestone

Metaline Falls Washington
BT	United States
	.Washington
	..Pend Oreille County Washington
	...Metaline Falls Washington
SN	Town in NE Washington.

Metaline Limestone
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Cambrian
	....Middle Cambrian
	.....Metaline Limestone
RT	Washington
SN	NE Washington. Added to Thesaurus in 1985.

metallic meteorites
USE	iron meteorites

metallic minerals
USE	metal ores

metallogenesis
USE	metallogeny

metallogenic epochs
RT	economic geology
	metal ores
	metallogenic provinces
	metallogeny
	mineral deposits, genesis
	mineralization
SN	Added to Thesaurus in 1982.

metallogenic maps
BT	maps
	.metallogenic maps
RT	mineral deposits, genesis
	metal ores
	economic geology maps
	metallogenic provinces
	metallogeny
SN	Added to Thesaurus in 1993.

metallogenic provinces
UF	provinces, metallogenic
RT	mineral deposits, genesis
	metal ores
	economic geology
	Iberian pyrite belt
	mineralization
	metallogenic epochs
	metallogenic maps
	Quadrilatero Ferrifero
	Thompson nickel belt
	Viburnum Trend
SN	Some specific mines and mining districts may be found as See Also references in mines.

metallogeny
UF	metallogenesis
RT	geosynclines
	mineral deposits, genesis
	metal ores
	economic geology
	mineralization
	metallotects
	metallogenic epochs
	metallogenic maps

metallography
SN	Not a valid index term for GeoRef. See mineralogy and petrology.

metallotects
RT	controls
	metallogeny
	mineral deposits, genesis
SN	Any geologic feature which has influenced concentration of elements, resulting in formation of mineral deposits. Added to Thesaurus in 1989.

metallurgy
RT	alloys
	annealing
	hydrometallurgy
	metal ores
	metals
	smelters

metals
NT	actinides
	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
RT	alloys
	base metals
	chelation
	chemical elements
	complexing
	critical load
	geochemical cycle
	geochemistry
	isotopes
	ligands
	metal ores
	metallurgy
	native elements
	nonmetals
	ore minerals
	pollution
	trace metals
SN	Use metal ores for metals as a commodity.

metaluminous composition
RT	composition
	igneous rocks
	peralkalic composition
	peraluminous composition
SN	Added to Thesaurus in 1995.

metamict
SN	No longer a valid term for GeoRef as of 1981. Use metamict minerals.

metamict minerals
RT	crystal structure
	metamictization
	minerals
	radiation damage
SN	Before 1981, search metamict. Added to Thesaurus in 1981.

metamictization
RT	crystal structure
	metamict minerals
	minerals
	radiation damage

metamorphic aureoles
USE	aureoles

metamorphic belts
NT	greenstone belts
	schist belts
UF	belts, metamorphic
RT	plate tectonics
	terranes
	Barrovian-type deposits
	metamorphic core complexes

metamorphic core complexes
UF	core complexes
RT	tectonics
	plate tectonics
	terranes
	metamorphic rocks
	metamorphic belts
	shear zones
	complexes
SN	Added to Thesaurus in 1985.

metamorphic differentiation
SN	Not a valid index term for GeoRef. See migration of elements or zoning.

metamorphic grade
USE	grade

metamorphic petrology
SN	Not a valid GeoRef index term after 1970. Used in subfile N. Now use petrology or metamorphic rocks as applicable.

Metamorphic Petrology (category)
SN	Igneous 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
USE	metamorphism

metamorphic rocks
NT	amphibolites
	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
RT	actinolite facies
	amphibolite facies
	banded structures
	basement
	basement tectonics
	blueschist facies
	calc-silicate composition
	chemical properties
	complexes
	crystalline rocks
	deformation
	eclogite facies
	epidote-amphibolite facies
	fabric
	facies
	fine-graine

metamorphic zone
USE	aureoles

metamorphism
NT	anchimetamorphism
	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
UF	metamorphic processes
RT	geochemistry
	geochronology
	diagenesis
	anatexis
	deformation
	folds
	aureoles
	Barrovian-type deposits
	foliation
	boudinage
	cataclasis
	complexes
	feldspathization
	gra
SN	Indexed 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
BT	metamorphic rocks
	.metasedimentary rocks
	..metapelite

metaperidotite
BT	metamorphic rocks
	.metaigneous rocks
	..metaperidotite
RT	peridotites

metaplutonic rocks
BT	metamorphic rocks
	.metaplutonic rocks
RT	rocks
	metamorphism
	plutonic rocks
SN	Before 1978, also search metamorphic rocks AND metaplutonic.

metapyroxenite
BT	metamorphic rocks
	.metaigneous rocks
	..metapyroxenite
RT	pyroxenite

metarhyolite
BT	metamorphic rocks
	.metaigneous rocks
	..metarhyolite
RT	rhyolites

metasandstone
BT	metamorphic rocks
	.metasedimentary rocks
	..metasandstone
RT	sandstone

metasedimentary
SN	A valid index term through 1977. After 1977, use metasedimentary rocks.

metasedimentary rocks
BT	metamorphic rocks
	.metasedimentary rocks
NT	khondalite
	meta-arkose
	metachert
	metaconglomerate
	metagraywacke
	metalimestone
	metapelite
	metasandstone
	metasiltstone
	paragneiss
	shungite
RT	sedimentary rocks
	rocks
	supracrustals
	K-bentonite
	metabentonite
	turbidite
SN	Before 1978, also search metasedimentary; metasediments.

metasediments
SN	A valid term through 1974. Use metasedimentary rocks.

metasiltstone
BT	metamorphic rocks
	.metasedimentary rocks
	..metasiltstone
RT	siltstone

metasomatic rocks
BT	metamorphic rocks
	.metasomatic rocks
NT	fenite
	greisen
	propylite
	serpentinite
	skarn
	steatite
	tactite
	talc rock
UF	metasomatites
RT	petrology
	rocks
	metasomatism
	alteration
	restites
SN	As of 1978, term is used for any rock produced by replacement processes at constant volume with little disturbance of textural or structural features.

metasomatism
NT	albitization
	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
RT	alteration
	carbonatization
	diagenesis
	dolomitization
	enrichment
	fenite
	geochemistry
	granitization
	hydrothermal conditions
	igneous rocks
	intrusions
	lithogeochemistry
	localization
	magma transport
	metamorphic rocks
	metamorphism
	metasomatic rocks
	mineral depo
SN	For documents before 1976, also search replacement. Indexed with material and specific process where available.

metasomatites
USE	metasomatic rocks

metastibnite
BT	sulfides
	.metastibnite
RT	stibnite

Metatheria
BT	Chordata
	.Vertebrata
	..Tetrapoda
	...Mammalia
	....Theria
	.....Metatheria
NT	Marsupialia

metatuff
BT	metamorphic rocks
	.metaigneous rocks
	..metatuff
RT	tuff

metaturbidite
USE	turbidite

metavolcanic
SN	A valid term through 1977.

metavolcanic rocks
BT	metamorphic rocks
	.metavolcanic rocks
RT	rocks
	volcanic rocks
	supracrustals
	metadacite
SN	Before 1978, also search metamorphic rocks AND metavolcanic.

Metazoa
RT	Invertebrata
	microfossils
	Protista
SN	Used as a general fossil term. Also search individual phyla and groups. Indexed with microfossils if applicable.

Metcalfe County Kentucky
BT	United States
	.Kentucky
	..Metcalfe County Kentucky

meteor crate

Meteor Crater
BT	United States
	.Arizona
	..Coconino County Arizona
	...Meteor Crater
UF	Barringer Crater
	Canyon Diablo Crater
	Coon Butte
	Crater Mound
RT	impact features
	Canyon Diablo Meteorite
SN	In Canyon Diablo area of Coconino County, N central Arizona. Search in combination with Arizona. Added to Thesaurus in 1995.

meteor craters
BT	impact features
	.impact craters
	..meteor craters
UF	meteorite crater
RT	geochronology
	tectonics
	meteorites
	geomorphology
	relative age
	breccia
	metamorphism
	deformation
	astroblemes
	craters
	bolides
	crater lakes
	cryptoexplosion features
	shatter cones
	resurfacing
	impacts
	shock metamorphism
SN	Used for impact craters formed by the falling of a large meteorite onto a surface.

meteoric iron
USE	iron meteorites

meteoric water
RT	connate waters
	ground water
	oil-water interface
	pore water
	reservoir rocks
	water
SN	Added to Thesaurus in 1989.

meteorite crater
USE	meteor craters

meteorite flux
RT	meteorites
SN	Before 1981, search meteorites AND flux. Added to Thesaurus in 1981.

meteorites
NT	Acfer 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
UF	cosmolites
	skystones
RT	isotopes
	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
SN	Used 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
RT	asteroids
	cosmic dust
	interplanetary space
	meteorites
	meteors
	parent bodies
	planets

meteorology
RT	aerosols
	air-sea interface
	atmosphere
	atmospheric precipitation
	boundary interactions
	circulation
	climate
	clouds
	convection
	diffusion
	droplets
	electromagnetic waves
	geophysics
	humidity
	hurricanes
	hydrologic cycle
	hydrology
	ions
	lightning
	particles
	raindro
SN	Primarily used for special indexes.

meteors
NT	bolides
UF	shooting star
RT	planetology
	meteorites
	interplanetary space
	meteoroids
	fireballs
	comets

methane
BT	organic compounds
	.hydrocarbons
	..aliphatic hydrocarbons
	...alkanes
	....methane
RT	methanol
	coalbed methane
	natural gas

methanethiomethane
USE	dimethyl sulfide

methanol
BT	organic compounds
	.alcohols
	..methanol
UF	methyl alcohol
RT	pollution
	pollutants
	biodegradation
	volatiles
	methane
	petroleum products
SN	For pollution studies, also index pollutants or water quality as applicable. Added to Thesaurus in 1995.

methodology
USE	methods

methods
UF	methodology
RT	fission-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
SN	This 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

Methow Basin
BT	North America
	.Methow Basin
RT	Washington
	British Columbia
	Methow River valley
SN	Sedimentary 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
BT	United States
	.Washington
	..Okanogan County Washington
	...Methow River valley
RT	Methow Basin
SN	Okanogan County on British Columbia border. Also search Methow River.

methoxychlor
USE	DDT

methyl alcohol
USE	methanol

methyl mercury
USE	methylmercury

methyl sulfide
USE	dimethyl sulfide

methylation
RT	chemical reactions
	geochemistry
	processes

methylmercury
UF	methyl mercury
RT	fungicides
	pesticides
	pollutants
	toxic materials
	mercury
	organo-metallics
SN	CHmethylmercury compounds. Fungicides, disinfectants.

Metohija Yugoslavia
BT	Europe
	.Southern Europe
	..Yugoslavia
	...Serbia
	....Kosovo-Metohija Yugoslavia
	.....Metohija Yugoslavia
SN	District in SW Serbia forming part of autonomous province of Kosovo-Metohija.

metolachlor
BT	pesticides
	.herbicides
	..metolachlor
RT	agrochemicals
	pollutants

metribuzin
BT	pesticides
	.herbicides
	..triazines
	...metribuzin
RT	pollutants
	toxic materials

Meurthe-et-Moselle France
BT	Europe
	.Western Europe
	..France
	...Meurthe-et-Moselle France
RT	Lorraine
	Laneuveville-devant-Nancy Boring
SN	Department in NE France.

Meuse France
BT	Europe
	.Western Europe
	..France
	...Meuse France
NT	Verdun France
SN	Department in NE France.

Meuse River
BT	Europe
	.Western Europe
	..Meuse River
UF	Maas River
RT	France
	Netherlands
	Belgium
SN	Rises 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
BT	Europe
	.Western Europe
	..Meuse Valley
UF	Maas Valley
RT	France
	Netherlands
	Belgium
SN	River valley. Known as the Maas Valley in the Netherlands. Indexed with countries as applicable.

Mexicali Mexico
BT	Mexico
	.Baja California Norte Mexico
	..Mexicali Mexico

Mexicali Valley
BT	North America
	.Mexicali Valley
RT	Mexico
	Baja California
	California
	Imperial County California
	Imperial Valley
SN	Baja 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
USE	Mexican volcanic belt

Mexican volcanic belt
BT	Mexico
	.Mexican volcanic belt
UF	Mexican neovolcanic belt
RT	Guerrero Mexico
	Sierra Madre Occidental
	Colima
	Jalisco Mexico
	Colima Mexico
	Sierra Madre del Sur
	Michoacan Mexico
	Nayarit Mexico
	Puebla Mexico
	Oaxaca Mexico
SN	SW Mexico. Indexed with states as applicable. Added to Thesaurus in 1989.

Mexico
NT	Baja 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
RT	Acapulco Meteorite
	Agua Blanca Fault
	Aguacate Group
	Alisitos Formation
	Allende Meteorite
	Altiplano
	Buda Limestone
	California Current
	Cerro Prieto Fault
	Chicxulub Crater
	co

Mexico Basin
SN	Not a valid term for GeoRef. See Sigsbee Deep or Valley of Mexico.

Mexico City earthquake 1985
BT	earthquakes
	.Mexico City earthquake 1985
UF	Michoacan earthquake 1985
RT	Mexico
	Michoacan Mexico
SN	Michoacan, Mexico. Before 1993, also search Mexico earthquake 1985. Added to Thesaurus in 1993.

Mexico City Mexico
BT	Mexico
	.Mexico state
	..Federal District Mexico
	...Mexico City Mexico
RT	Valley of Mexico
SN	Central Mexico. In Federal District Mexico.

Mexico D.F.
USE	Federal District Mexico

Mexico state
BT	Mexico
	.Mexico state
NT	Federal District Mexico
RT	Guerrero Terrane
	Valley of Mexico
	Popocatepetl
SN	State N, E and W of Federal District.

meymechite
USE	meimechite

Mezen River basin
BT	Commonwealth of Independent States
	.Russian Federation
	..Mezen River basin
BT	Europe
	.Mezen River basin
RT	Arkhangelsk Russian Federation
	Komi Russian Federation
SN	N central Arkhangelsk Oblast in NW European Russian Federation. Also search Mezen River. This term has multiple hierarchies.

Mezen Russian Federation
BT	Commonwealth of Independent States
	.Russian Federation
	..Arkhangelsk Russian Federation
	...Mezen Russian Federation
SN	Town 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
BT	Europe
	.Belarus
	..Mezhrechye Belarus
SN	Village in W Belarus. This term has multiple hierarchies.

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