Ar  search
USEargon
ar River basin#Bear River Formation#Bear River Range#Beaver River#Bird Spring Fo  search
Ar-36  search
BTisotopes
 .stable isotopes
 ..Ar-36
BTnoble gases
 .argon
 ..Ar-36
RTAr-38/Ar-36
 Ar-40/Ar-36
SNThis term has multiple hierarchies.
Ar-36/Ar-38  search
USEAr-38/Ar-36
Ar-36/Ar-40  search
USEAr-40/Ar-36
Ar-37  search
BTisotopes
 .radioactive isotopes
 ..Ar-37
BTnoble gases
 .argon
 ..Ar-37
SNArtificial. This term has multiple hierarchies.
Ar-38  search
BTisotopes
 .radioactive isotopes
 ..Ar-38
BTnoble gases
 .argon
 ..Ar-38
RTAr-38/Ar-36
SNThis term has multiple hierarchies.
Ar-38/Ar-36  search
BTisotopes
 .radioactive isotopes
 ..Ar-38/Ar-36
BTisotopes
 .stable isotopes
 ..Ar-38/Ar-36
BTnoble gases
 .argon
 ..Ar-38/Ar-36
UFAr-36/Ar-38
RTisotope ratios
 Ar-36
 Ar-38
SNThis term has multiple hierarchies.
Ar-39  search
BTisotopes
 .radioactive isotopes
 ..Ar-39
BTnoble gases
 .argon
 ..Ar-39
RTAr-40/Ar-39
SNArtificial. This term has multiple hierarchies.
Ar-39/Ar-40  search
USEAr-40/Ar-39
Ar-40  search
BTisotopes
 .stable isotopes
 ..Ar-40
BTnoble gases
 .argon
 ..Ar-40
RTAr-40/Ar-36
 Ar-40/Ar-39
SNThis term has multiple hierarchies.
Ar-40/Ar-36  search
BTisotopes
 .stable isotopes
 ..Ar-40/Ar-36
BTnoble gases
 .argon
 ..Ar-40/Ar-36
UFAr-36/Ar-40
RTisotope ratios
 Ar-36
 Ar-40
SNThis term has multiple hierarchies.
Ar-40/Ar-39  search
BTisotopes
 .radioactive isotopes
 ..Ar-40/Ar-39
BTisotopes
 .stable isotopes
 ..Ar-40/Ar-39
BTnoble gases
 .argon
 ..Ar-40/Ar-39
UFAr-39/Ar-40
RTisotope ratios
 Ar-39
 Ar-40
SNThis term has multiple hierarchies.
Ar/Ar  search
UFargon-argon
RTabsolute age
 isotope ratios
 thermochronology
 argon
SNIsotopic ratio used in age determination.
Arab Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Jurassic
 ....Upper Jurassic
 .....Arab Formation
RTUnited Arab Emirates
 Saudi Arabia
SNAdded to Thesaurus in 1989.
Arabia  search
SNNot a valid term for GeoRef. See Arabian Peninsula, Saudi Arabia, or Arabia Regio for the Martian feature.
Arabia Regio  search
BTMars
 .Arabia Regio
SNAlbedo feature.
Arabian Desert  search
USEEastern Desert
Arabian Gulf  search
USEPersian Gulf
Arabian Peninsula  search
BTAsia
 .Arabian Peninsula
NTArabian Shield
 Bahrain
 Kuwait
 Oman
 Qatar
 Saudi Arabia
 United Arab Emirates
 Yemen
RTMiddle East
 Red Sea Rift
SNBetween Red Sea on the W; and the Persian Gulf, Gulf of Oman, and Arabian Sea on the E. Indexed with countries as applicable.
Arabian Plate  search
RTplate tectonics
 plates
 Saudi Arabia
SNIndexed with geographic area and/or age as applicable.
Arabian Ridge  search
USECarlsberg Ridge
Arabian Sea  search
BTIndian Ocean
 .Arabian Sea
NTGulf of Aden
 Gulf of Cambay
 Gulf of Oman
 Indus Fan
 Persian Gulf
RTDSDP Site 219
 DSDP Site 220
 DSDP Site 221
 DSDP Site 222
 DSDP Site 223
 DSDP Site 224
 Leg 117
 Leg 23
 ODP Site 720
 ODP Site 721
 ODP Site 722
 ODP Site 723
 ODP Site 724
 ODP Site 725
 ODP Site 726
 ODP Site 727
 ODP Site 728
 ODP Site 729
 ODP Site 730
 ODP Site 731
SNBetween the Arabian Peninsula on the W and Pakistan and India in the E.
Arabian Shield  search
BTAsia
 .Arabian Peninsula
 ..Arabian Shield
RTYemen
 Saudi Arabia
SNNE part of the Ethiopian Shield. Indexed with countries as applicable.
Arabian-Indian Midoceanic Ridge  search
USECarlsberg Ridge
Arabian-Indian Ridge  search
USECarlsberg Ridge
Arabian-Nubian Shield  search
SNNot a valid term for GeoRef. Use Arabian Shield or Nubian Shield or both as applicable.
Arabic  search
RTcatalogs
 dictionaries
 glossaries
 lexicons
SNUsed for studies about the language.
Aracaju Brazil  search
BTSouth America
 .Brazil
 ..Sergipe Brazil
 ...Aracaju Brazil
SNCity on the Atlantic Ocean in NE Brazil.
Aracena Spain  search
BTelva Spain
 .Aracena Spain
SNTown near the Gulf of Cadiz.
Arachnida  search
BTInvertebrata
 .Arthropoda
 ..Chelicerata
 ...Arachnida
SNClass.
Arad Romania  search
BTEurope
 .Southern Europe
 ..Banat
 ...Arad Romania
BTEurope
 .Southern Europe
 ..Romania
 ...Arad Romania
SNCity and county near the Hungarian border. This term has multiple hierarchies.
Araeoscelidia  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Reptilia
 ....Diapsida
 .....Araeoscelidia
RTTrilophosauria
SNOrder. Before 1993, Trilophosauria was a narrower term.
Arafura Sea  search
BTPacific Ocean
 .South Pacific
 ..Southwest Pacific
 ...Arafura Sea
RTAustralia
 Indonesia
 McArthur Basin
 Torres Strait
SNSea between N Australia and Indonesia; 800 miles long by about 350 miles wide. This term has multiple hierarchies.
Aragats  search
RTArmenia
 Lesser Caucasus
SNA mountain in NW Armenia. Indexed with regions and mountains as applicable.
Aragon Spain  search
BTEurope
 .Southern Europe
 ..Iberian Peninsula
 ...Spain
 ....Aragon Spain
NTHuesca Spain
 Saragossa Spain
 Teruel Spain
SNRegion and ancient kingdom in NE Spain.
aragonite  search
BTcarbonates
 .aragonite
RTalabaster
 calcite
 calcium carbonate
 pearls
 witherite
Aragua Venezuela  search
BTSouth America
 .Venezuela
 ..Aragua Venezuela
SNState in N Venezuela.
Aragva River  search
USEAragvi River
Aragvi River  search
BTEurope
 .Georgian Republic
 ..Aragvi River
UFAragva River
SNN central Georgian Republic.
Aral region  search
BTCommonwealth of Independent States
 .Aral region
BTAsia
 .Central Asia
 ..Aral region
UFAral Sea region
RTKazakhstan
 Uzbekistan
 Turkmenia
SNBefore 1978, also search Aral. This term has multiple hierarchies. Indexed with former Soviet republics as applicable.
Aral Sea  search
BTCommonwealth of Independent States
 .Aral Sea
BTAsia
 .Central Asia
 ..Aral Sea
RTBarsakelmes
SNBetween Kazakhstan and Uzbekistan. Also search Aral. This term has multiple hierarchies.
Aral Sea region  search
USEAral region
Aransas County Texas  search
BTUnited States
 .Texas
 ..Aransas County Texas
Arapahoe County Colorado  search
BTUnited States
 .Colorado
 ..Arapahoe County Colorado
SNS and SE of Denver in N central Colorado.
Arapien Shale  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Jurassic
 ....Arapien Shale
RTUtah
SNCentral Utah. Added to Thesaurus in 1985.
Ararat  search
RTTurkey
SNMountain in Turkey at N39#DG44' E044#DG15' near Iranian and Armenian borders. Also used in Armenia as well as other locations. Search with country name. Indexed with Turkey or location as applicable.
Araripe Basin  search
BTSouth America
 .Brazil
 ..Araripe Basin
RTCeara Brazil
 Pernambuco Brazil
SNNE Brazil. Indexed with states as applicable.
Arauco Chile  search
BTSouth America
 .Chile
 ..Arauco Chile
SNFormer province in S central Chile.
Arava rift valley  search
USEArava Valley
Arava Valley  search
BTAsia
 .Middle East
 ..Arava Valley
UFArava rift valley
RTRed Sea Rift
 Israel
 Jordan
SNPart of Red Sea Rift valley extending along the Arava Fault between the Red Sea and the Dead Sea. Also search Arava. Indexed with country as applicable. Index Red Sea Rift if applicable.
Aravalli Group  search
USEAravalli System
Aravalli Range  search
BTAsia
 .Indian Peninsula
 ..India
 ...Rajasthan India
 ....Aravalli Range
RTKhetri copper belt
SNCentral and S Rajasthan, NW India.
Aravalli Supergroup  search
USEAravalli System
Aravalli System  search
BTChronostratigraphic Units
 .Precambrian
 ..Archean
 ...Aravalli System
UFAravalli Group
 Aravalli Supergroup
RTIndia
 Rajasthan India
 Gujarat India
 Andhra Pradesh India
 Mattoon Formation
SNIncludes Dabari, Matoon, and Udaipur formations.
Araxa Brazil  search
BTSouth America
 .Brazil
 ..Minas Gerais Brazil
 ...Araxa Brazil
SNTown in W Minas Gerais.
Araya Peninsula  search
BTSouth America
 .Venezuela
 ..Sucre Venezuela
 ...Araya Peninsula
SNW Sucre.
Arbarastakh  search
BTCommonwealth of Independent States
 .Russian Federation
 ..Yakutia Russian Federation
 ...Arbarastakh
SNCarbonatite complex in Yakutia. This term has multiple hierarchies.
Arbuckle Anticline  search
BTUnited States
 .Oklahoma
 ..Arbuckle Anticline
RTAnadarko Basin
 Arbuckle Mountains
SNAnadarko Basin, S Oklahoma. Added to Thesaurus in 1989.
Arbuckle Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Arbuckle Group
RTLower Ordovician
 Oklahoma
 Kindblade Formation
 Upper Cambrian
SNUpper Cambrian and Lower Ordovician. Subdivided into Fort Sill Limestone, Royer Marble, Signal Mountain Limestone, Chapman Ranch Dolomite, Wolf Creek Dolomite, Cool Creek Limestone, Alden Limestone, and West Spring Creek Formation. S Oklahoma. Indexed wit
Arbuckle Mountains  search
BTUnited States
 .Oklahoma
 ..Arbuckle Mountains
RTArbuckle Anticline
 Carter County Oklahoma
 Murray County Oklahoma
 Wichita Uplift
SNCarter and Murray counties, S central Oklahoma.
ARC/INFO  search
RTcartography
 computer programs
 data processing
 geographic information systems
 information systems
 mapping
 models
SNData model system for processing geographic information.
Arcachon Basin  search
BTEurope
 .Western Europe
 ..France
 ...Gironde France
 ....Arcachon Basin
RTBay of Biscay
SNInlet of Bay of Biscay in SW France.
arch dams  search
BTdams
 .arch dams
UFarchdams
Archaean  search
USEArchean
Archaediscidae  search
BTmicrofossils
 .Fusulinina
 ..Archaediscidae
SNFamily. This term has multiple hierarchies.
Archaeoceti  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Mammalia
 ....Theria
 .....Eutheria
 ......Cetacea
 .......Archaeoceti
SNSuborder.
Archaeocopida  search
USEArcheocopida
Archaeocyatha  search
BTInvertebrata
 .Archaeocyatha
Archaeogastropoda  search
BTInvertebrata
 .Mollusca
 ..Gastropoda
 ...Archaeogastropoda
NTBellerophontina
Archaeolithothamnium  search
BTPlantae
 .algae
 ..Rhodophyta
 ...Corallinaceae
 ....Archaeolithothamnium
RTmicrofossils
SNIndexed with microfossils if applicable.
archaeological sites  search
UFsites, archaeological
RTarchaeology
 fossil man
 artifacts
 geologic sites
 middens
archaeology  search
UFarcheology
 geoarchaeology
RTAcheulian
 Paleolithic
 paleoecology
 fossil man
 archaeological sites
 artifacts
 middens
 art
 Aurignacian
 Bronze Age
 Chalcolithic
 Clovis
 Iron Age
 Levalloisian
 Lubbock Lake
 Magdalenian
 Mesolithic
 Mousterian
 Neolithic
 ocher
 paleopathology
 paleoseismicity
 petrogl
Archaeomonadaceae  search
BTInvertebrata
 .Protista
 ..ebridians
 ...Archaeomonadaceae
RTmicrofossils
SNIndexed with microfossils if applicable.
Archaeopteris  search
BTPlantae
 .Pteridophyta
 ..Filicopsida
 ...Archaeopteris
SNGenus.
Archaeopteryx  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Aves
 ....Archaeornithes
 .....Archaeopteryx
SNGenus.
Archaeornithes  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Aves
 ....Archaeornithes
NTArchaeopteryx
RTNeornithes
SNSubclass.
Archaeozoic  search
USEArchean
Archangel Russian Federation  search
USEArkhangelsk Russian Federation
archdams  search
USEarch dams
Archean  search
BTChronostratigraphic Units
 .Precambrian
 ..Archean
NTEoarchean
 Paleoarchean
 Mesoarchean
 Neoarchean
 Amisk Group
 Aravalli System
 Arunta Complex
 Blake River Group
 Blondeau Formation
 Bulawayan Group
 Gangpur Series
 Gilman Formation
 Hayes River Group
 Iron Ore Group
 J-M Reef
 Krivoy Rog Series
 lower Archean
 middle Archean
 Napier Complex
 Nuk Gneiss
 Opemisca Group
 Peninsular Gneiss
 Rice Lake Group
 Roy Group
 Sausar Series
 Singhbhum Granite
 Taihua Group
 Timiskaming Group
 upper Archean
 Vermilion granitic complex
 Warrawoona Group
 Yellowknife Group
UFArchaean
 Archaeozoic
 Archeozoic
 lower Precambrian
RTCheshire Formation
 Closepet Granite
 Kaapvaal Craton
 Lewisian Complex
 Limpopo Orogeny
 Moldanubian
Archeocopida  search
BTmicrofossils
 .Archeocopida
BTInvertebrata
 .Arthropoda
 ..Mandibulata
 ...Crustacea
 ....Ostracoda
 .....Archeocopida
UFArchaeocopida
SNOrder. This term has multiple hierarchies.
archeology  search
USEarchaeology
Archeozoic  search
USEArchean
Archer County Texas  search
BTUnited States
 .Texas
 ..Archer County Texas
arches  search
RTabutments
 anticlines
 arcuate structures
 domes
 folds
 swells
 tectonics
Arches National Park  search
BTUnited States
 .Utah
 ..Arches National Park
RTnational parks
SNIn SE Utah. Before 1981, also search Arches and Utah. Added to Thesaurus in 1981.
Archie equation  search
USEArchie's law
Archie's law  search
UFArchie equation
RTpetroleum engineering
 well-logging
 equations
 mathematical methods
 resistivity
 formation evaluation
 porosity
 reservoirs
SNEquation expressing the relationship between resistivity of the geologic formation, resistivity of water contained within the pores of the rock, porosity of the rock, and amount of pore space occupied by water. Added to Thesaurus in 1989.
Archosauria  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Reptilia
 ....Diapsida
 .....Archosauria
NTCrocodilia
 Ornithischia
 Pterosauria
 Saurischia
 Thecodontia
SNSubclass. Archosauromorpha is considered a broader term.
Archostemata  search
BTInvertebrata
 .Arthropoda
 ..Mandibulata
 ...Insecta
 ....Pterygota
 .....Neoptera
 ......Endopterygota
 .......Coleoptera
 ........Archostemata
SNSuborder.
Archuleta County Colorado  search
BTUnited States
 .Colorado
 ..Archuleta County Colorado
SNOn New Mexico border in SW Colorado.
Arcina  search
BTInvertebrata
 .Mollusca
 ..Bivalvia
 ...Arcina
RTCyrtodontida
arcs  search
SNAs of 1993, no longer a valid term for GeoRef. Usually out-of-scope. Used with electrical field. See arcuate structures.
arcs, island  search
USEisland arcs
Arctic  search
SNNot a valid GeoRef index term after 1969.
Arctic America  search
SNNow use Alaska, Yukon Territory or Northwest Territories as applicable. See also Arctic Archipelago.
Arctic Archipelago  search
BTCanada
 .Northwest Territories
 ..Franklin District Northwest Territories
 ...Arctic Archipelago
UFArctic Islands
RTArctic Coastal Plain
 Arctic region
 Queen Elizabeth Islands
 Baffin Island
 Banks Island
 Bathurst Island
 Ellesmere Island
 Victoria Island
SNLarge group of islands in the Arctic Ocean nearly coextensive with Franklin District, Northwest Territories, Canada.
Arctic Coastal Plain  search
BTArctic region
 .Arctic Coastal Plain
RTRussian Federation
 Greenland
 Alaska
 Arctic Archipelago
 Arctic National Wildlife Refuge
 Jan Mayen
 North Slope
 Northern Alaska
 Northwest Territories
 Svalbard
SNIndexed with countries or regions as applicable.
arctic environment  search
RTclimate
 depositional environment
 ecology
 marine environment
 paleoclimatology
 paleoecology
 terrestrial environment
SNBefore 1978, also search arctic.
Arctic Islands  search
USEArctic Archipelago
Arctic National Wildlife Refuge  search
BTUnited States
 .Alaska
 ..Northern Alaska
 ...Arctic National Wildlife Refuge
UFANWR
RTArctic Coastal Plain
 Arctic region
 Sadlerochit Mountains
SNArctic Coastal Plain of NE Alaska. Added to Thesaurus in 1989.
Arctic Ocean  search
NTAlpha Cordillera
 Amerasia Basin
 Barents Sea
 Beaufort Sea
 Canada Basin
 Chukchi Sea
 East Siberian Sea
 Eurasia Basin
 Fram Strait
 Kara Sea
 Laptev Sea
 Lomonosov Ridge
 Makarov Basin
 Mendeleyev Ridge
 Mid-Arctic Ocean Ridge
 Nares Strait
 Norwegian Sea
 Yermak Plateau
UFArctic Sea
 North Polar Sea
RTArctic region
 CESAR
 Jan Mayen
 Baffin Bay
 Barrow Alaska
 Bear Island
 Beerenberg
 Davis Strait
 DSDP Site 268
 DSDP Site 336
 Leg 105
 Leg 151
 North Atlantic Deep Water
 ODP Site 645
 ODP Site 646
 ODP Site 647
 ODP Site 909
 ODP Site 910
 ODP Site 911
 ODP Site 912
 Rus
SNExtends from North Pole southward to approximately 70#DG N and is bounded by Alaska, Canada, Greenland, Norway, and the Russian Federation. Before 1981, Jan Mayen, Svalbard, and Bear Island were included as narrower terms. Before 1970, also search Arctic.
Arctic region  search
NTArctic Coastal Plain
 Greenland
 Jan Mayen
 North Pole
 Russian Arctic
 Svalbard
RTAlaska
 Arctic Archipelago
 Arctic National Wildlife Refuge
 Arctic Ocean
 Bear Island
 Canada
 Finland
 Hecla Hoek Formation
 Iceland
 Norway
 Novaya Zemlya
 polar regions
 Queen Elizabeth Islands
 Richards Island
 subarctic regions
 Sweden
 Vesteralen
SNThe Arctic Ocean and islands in it and adjacent to it plus mainland surfaces N of the Arctic circle. Before 1970, also search Arctic. Indexed with Alaska, Arctic Archipelago, Arctic Ocean, Greenland, and countries as applicable.
Arctic Sea  search
USEArctic Ocean
Arctocyonia  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Mammalia
 ....Theria
 .....Eutheria
 ......Condylarthra
 .......Arctocyonia
arcuate faults  search
BTfaults
 .arcuate faults
RTarcuate structures
 boundary faults
 peripheral faults
SNBefore 1978, also search arcuate AND faults.
arcuate structures  search
RTarches
 arcuate faults
 coronae
 fold and thrust belts
 greenstone belts
 island arcs
 ring structures
SNGeneral. Use more specific term if applicable. Added to Thesaurus in 1993.
Ardara Pluton  search
BTEurope
 .Western Europe
 ..Ireland
 ...Donegal Ireland
 ....Ardara Pluton
SNAn igneous intrusion in NW Ireland.
Ardeche France  search
BTEurope
 .Western Europe
 ..France
 ...Ardeche France
NTLargentiere France
 Privas France
RTCevennes
 Juvinas Meteorite
 Vivarais
SNDepartment in S France.
Ardennes  search
BTEurope
 .Western Europe
 ..Ardennes
UFForest of Ardennes
RTArdennes France
 Givet France
 Hohe Venn
 Luxembourg
 Luxembourg Belgium
 Rhenish Schiefergebirge
 Rocroi France
 Sedan France
 Stavelot Belgium
SNWooded plateau region. Indexed with countries as applicable.
Ardennes Department France  search
USEArdennes France
Ardennes France  search
BTEurope
 .Western Europe
 ..France
 ...Ardennes France
NTGivet France
 Rocroi France
 Sedan France
UFArdennes Department France
RTArdennes
SNDepartment in NE France. Before 1981, also search Ardennes.
Ardmore Basin  search
BTUnited States
 .Ardmore Basin
RTOklahoma
 Texas
SNS Oklahoma and N Texas. Indexed with states as applicable. Added to Thesaurus in 1985.
Ardnamurchan  search
BTEurope
 .Western Europe
 ..United Kingdom
 ...Great Britain
 ....Scotland
 .....Argyllshire Scotland
 ......Ardnamurchan
BTEurope
 .Western Europe
 ..United Kingdom
 ...Great Britain
 ....Scotland
 .....Highland region Scotland
 ......Ardnamurchan
SNPeninsula and parish in Argyll County, N of Mull Island in W Scotland. This term has multiple hierarchies.
arduinite  search
USEmordenite
Areado Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Lower Cretaceous
 .....Areado Formation
RTAptian
 Brazil
 Minas Gerais Brazil
areal geology  search
RTbibliography
 expeditions
 explanatory text
 geology
 guidebook
 maps
 regional
SNUsed for entries that might properly be placed under three or more of the major discipline headings such as geomorphology, stratigraphy, structural geology.
Areal Geology (category)  search
SNAreal geology, GeoRef category code 13, 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 (See List A.).
areal studies  search
SNNo longer a valid term for GeoRef. Before 1998, used with clay mineralogy. Used before 1973 as a general term.
areas described  search
SNUsed in subfiles E and N. See areal geology; areal studies.
Arecibo Puerto Rico  search
BTCaribbean region
 .West Indies
 ..Antilles
 ...Greater Antilles
 ....Puerto Rico
 .....Arecibo Puerto Rico
SNCity in S Puerto Rico on Caribbean Sea.
Arecidae  search
BTPlantae
 .Spermatophyta
 ..Angiospermae
 ...Monocotyledoneae
 ....Arecidae
Arenac County Michigan  search
BTUnited States
 .Michigan
 ..Michigan Lower Peninsula
 ...Arenac County Michigan
arenaceous texture  search
BTtextures
 .arenaceous texture
UFarenarious texture
 psammitic texture
 sabulous texture
 sandy texture
RTsedimentary rocks
 sand
 sediments
 sandstone
SNBefore 1978, also search arenaceous AND specific sediment type or sedimentary rock.
Arenal  search
BTCentral America
 .Costa Rica
 ..Arenal
RTvolcanoes
SNVolcano in NW Costa Rica.
arenarious texture  search
USEarenaceous texture
Arendal Norway  search
BTEurope
 .Western Europe
 ..Scandinavia
 ...Norway
 ....Arendal Norway
SNA city on the Skagerrak.
arendalite  search
USEepidote
arenes  search
USEaromatic hydrocarbons
Arenicolites  search
BTichnofossils
 .Arenicolites
RTVermes
 burrows
Arenig  search
BTEurope
 .Western Europe
 ..United Kingdom
 ...Great Britain
 ....Wales
 .....Merionethshire Wales
 ......Arenig
RTArenigian
SNTwo mountains in N Merionethshire (Gwynedd) in N Wales. One is called Arenig Fach and the other Arenig Fawr. For the age term, see Arenigian.
Arenigian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Ordovician
 ....Lower Ordovician
 .....Arenigian
NTBallantrae Complex
RTArenig
 Buchans Group
 San Juan Formation
SNEurope. Above Tremadocian, below Llanvirnian. Before 1978, also search Arenig.
arenite  search
BTsedimentary rocks
 .clastic rocks
 ..arenite
NTlitharenite
 quartz arenite
 sublitharenite
RTterrigenous materials
Arequipa Peru  search
BTSouth America
 .Peru
 ..Arequipa Peru
SNDepartment in S Peru. Also a city.
Ares Vallis  search
BTMars
 .Ares Vallis
RTMars Pathfinder Program
arfvedsonite  search
BTsilicates
 .chain silicates
 ..amphibole group
 ...clinoamphibole
 ....arfvedsonite
Argentera Italy  search
BTEurope
 .Southern Europe
 ..Italy
 ...Piemonte Italy
 ....Argentera Italy
SNVillage in NW Italy.
Argentera Massif  search
BTEurope
 .Southern Europe
 ..Italy
 ...Piemonte Italy
 ....Argentera Massif
SNS Piemonte.
Argenteuil County Quebec  search
BTCanada
 .Eastern Canada
 ..Quebec
 ...Argenteuil County Quebec
Argentiere Glacier  search
BTute-Savoie France
 .Argentiere Glacier
RTMont Blanc
 Pennine Alps
SNIn the Mont Blanc Massif of the Pennine Alps.
Argentina  search
BTSouth America
 .Argentina
NTArgentine Andes
 Buenos Aires Argentina
 Catamarca Argentina
 Chaco Argentina
 Chubut Argentina
 Cordoba Argentina
 Corrientes Argentina
 Jujuy Argentina
 La Pampa Argentina
 La Rioja Argentina
 Mendoza Argentina
 Neuquen Argentina
 Neuquen Basin
 Paganzo Basin
 Pampas
 Pampean Mountains
 Rio Negro Argentina
 Salado Basin
 Salta Argentina
 San Juan Argentina
 San Luis Argentina
 Santa Cruz Argentina
 Santa Fe Argentina
 Santiago del Estero Argentina
 Tucuman Argentina
RTAltiplano
 Andes
 Martin Formation
 Baquero Formation
 Campo del Cielo Meteorite
 Chaco
 Chanares Formation
 Colorado River
 Famatina System
 Guandacol Formation
 Paganzo Group
 Parana Basin
 Parana River
 Patagonia
 Patagonian Andes
 Patagonian Batholith
 Precordillera
Argentine Andes  search
BTSouth America
 .Andes
 ..Argentine Andes
BTSouth America
 .Argentina
 ..Argentine Andes
SNRegion in Argentina. This term has multiple hierarchies. Added to Thesaurus in 1981.
Argentine Basin  search
BTAtlantic Ocean
 .South Atlantic
 ..Argentine Basin
RTVema Channel
 DSDP Site 331
 DSDP Site 358
 Leg 39
SNE of Argentina in SW Atlantic.
argentite  search
BTsulfides
 .argentite
UFargyrite
RTacanthite
 silver ores
 silver
Arges River  search
BTEurope
 .Southern Europe
 ..Romania
 ...Arges River
SNIn S Romania.
argillaceous rocks  search
USEargillaceous texture
argillaceous texture  search
BTtextures
 .argillaceous texture
UFargillaceous rocks
RTclay mineralogy
 sedimentary rocks
 clay minerals
 clay
 sediments
 argillite
 marl
 shale
SNBefore 1978, also search argillaceous AND specific sediment type or sedimentary rock.
argillite  search
BTsedimentary rocks
 .clastic rocks
 ..argillite
UFdropstone
RTargillization
 terrigenous materials
 argillaceous texture
argillization  search
BTmetasomatism
 .argillization
RTprocesses
 feldspar group
 clay minerals
 alteration
 argillite
SNAdded to Thesaurus in 1989.
Argo abyssal plain  search
BTIndian Ocean
 .Argo abyssal plain
RTDSDP Site 261
 Leg 123
 ODP Site 765
SNEastern Indian Ocean.
Argolis Greece  search
BTEurope
 .Southern Europe
 ..Greece
 ...Peloponnesus Greece
 ....Argolis Greece
SNDepartment in E Peloponnesus.
argon  search
BTnoble gases
 .argon
NTAr-36
 Ar-37
 Ar-38
 Ar-38/Ar-36
 Ar-39
 Ar-40
 Ar-40/Ar-36
 Ar-40/Ar-39
UFAr
RTAr/Ar
 isotopes
 K/Ar
argon-argon  search
USEAr/Ar
Argovian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Jurassic
 ....Upper Jurassic
 .....Argovian
SNEurope. Substage in Great Britain: Upper Jurassic (lower Lusitanian; above Oxfordian Stage, below Rauracian Substage).
Argun Ri  search
Argun River  search
RTAmur River
 Asia
 Europe
 Georgian Republic
 Greater Caucasus
 Russian Far East
 Russian Federation
 Shilka Valley
 Transbaikalia
SNRises in NE China and serves as part of boundary between NE China and Russian Federation. Joins with Shilka River to form the Amur River. Also a river in the Greater Caucasus, in Georgian Republic and Russian Federation. Indexed with Europe or Asia and Ch
Argyllshire Scotland  search
BTEurope
 .Western Europe
 ..United Kingdom
 ...Great Britain
 ....Scotland
 .....Argyllshire Scotland
NTArdnamurchan
 Islay
 Kintyre
 Mull Island
RTHighland region Scotland
 Ballachulish Complex
 Firth of Clyde
 Glen Coe
 Strathclyde region Scotland
SNFormer county in NW Scotland which in 1975 was split between Highland and Strathclyde regions. The latter has the major part. Before 1993, also search Argyll and Scotland. Indexed with region as applicable.
argyrite  search
USEargentite
Ariake Bay  search
BTAsia
 .Far East
 ..Japan
 ...Kyushu
 ....Ariake Bay
SNOn East China Sea on W coast of Kyushu. Also search Ariake Sea.
arid environment  search
BTterrestrial environment
 .arid environment
UFarid regions
RTecology
 geomorphology
 depositional environment
 land use
 climate
 subaerial environment
 paleoclimatology
 barchans
 deserts
 rock varnish
 sebkha environment
 semi-arid environment
 wadis
 yardangs
SNBefore 1978, also search arid.
arid regions  search
USEarid environment
Arida-gawa  search
BTnshu
 .Wakayama Japan
 ..Arida-gawa
UFArita River
 Aritagawa
SNW Kii Peninsula S of Osaka, S Honshu. Added to Thesaurus in 1993.
Aridisols  search
BTsoils
 .Aridisols
RTsoil group
Ariege France  search
BTEurope
 .Western Europe
 ..France
 ...Ariege France
NTCastillon Massif
 Querigut Massif
 Saint-Girons France
RTLherz
 Salat Valley
SNDepartment in S France.
ariegite  search
BTigneous rocks
 .plutonic rocks
 ..ultramafics
 ...ariegite
RTwebsterite
Ariel Satellite  search
RTicy satellites
 satellites
 Uranus
 Voyager Program
SNOne of the satellites of Uranus. Before 1989, also search Ariel AND Uranus. Added to Thesaurus in 1989.
Aries Valley  search
BTEurope
 .Southern Europe
 ..Romania
 ...Transylvania
 ....Aries Valley
SNRiver valley in W central Transylvania. Also search Aries.
Arikaree Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Tertiary
 ....Arikaree Group
RTWyoming
 Montana
 Colorado
 lower Miocene
 upper Oligocene
 South Dakota
 White River Group
SNUpper Oligocene to lower Miocene. Previously considered Miocene. The Arikaree Formation has been considered Miocene. Comprises Sharps, Monroe Creek, and Harrison Formations. Colorado, S South Dakota, SE Montana, and SE Wyoming. Indexed with upper Oligocen
Arikareean  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Tertiary
 ....Arikareean
RTlower Miocene
 upper Oligocene
 Kirkwood Formation
SNProvincial series, North America. Indexed with ages as applicable.
Aristarchus  search
BTMoon
 .Aristarchus
UFAristarchus Plateau
RTApollo 17
 Ocean of Storms
 Sea of Rains
SNLunar crater near Vallis Schroteri in region between Ocean of Storms and Sea of Rains. Added to Thesaurus in 1989.
Aristarchus Plateau  search
USEAristarchus
Arita River  search
USEArida-gawa
Aritagawa  search
USEArida-gawa
Ariyalur India  search
BTAsia
 .Indian Peninsula
 ..India
 ...Tamil Nadu India
 ....Ariyalur India
SNTown in S Tamil Nadu, S India.
Ariyalur Stage  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Upper Cretaceous
 .....Ariyalur Stage
RTIndia
SNS India.
Arize Massif  search
BTEurope
 .Western Europe
 ..France
 ...Arize Massif
SNN of the central Pyrenees.
Arizona  search
BTUnited States
 .Arizona
NTApache County Arizona
 Cochise County Arizona
 Coconino County Arizona
 Date Creek basin
 Gila County Arizona
 Graham County Arizona
 Greenlee County Arizona
 La Paz County Arizona
 Maricopa County Arizona
 Mogollon Plateau
 Mogollon Rim
 Mohave County Arizona
 Naha test well
 Navajo County Arizona
 Petrified Forest National Park
 Pima County Arizona
 Pinal County Arizona
 Rincon Mountains
 San Carlos Indian Reservation
 San Francisco Peaks
 Santa Cruz County Arizona
 Santa Rita Mountains
 Stanton's Cave
 Tucson Basin
 Yavapai County Arizona
 Yuma County Arizona
RTBlack Mesa
 Apache Group
 Apache Leap Tuff
 Basin and Range Province
 Bidahochi Formation
 Bisbee Group
 Black Mesa Basin
 Black Mountain
 Black Mountains
 Bright Angel Shale
 Brushy Basin Shale Member
 Burro Canyon Formation
 Canyon Diablo Meteorite
 Carmel Formation
Arkansas  search
BTUnited States
 .Arkansas
NTArkansas County Arkansas
 Ashley County Arkansas
 Baxter County Arkansas
 Benton County Arkansas
 Boone County Arkansas
 Bradley County Arkansas
 Calhoun County Arkansas
 Carroll County Arkansas
 Chicot County Arkansas
 Clark County Arkansas
 Clay County Arkansas
 Cleburne County Arkansas
 Cleveland County Arkansas
 Columbia County Arkansas
 Conway County Arkansas
 Craighead County Arkansas
 Crawford County Arkansas
 Crittenden County Arkansas
 Cross County Arkansas
 Dallas County Arkansas
 Desha County Arkansas
 Drew County Arkansas
 Faulkner County Arkansas
 Franklin County Arkansas
 Fulton County Arkansas
 Garland County Arkansas
 Grant County Arkansas
 Greene County Arkansas
 Hempstead County Arkansas
 Hot Spring County Arkansas
 Howard County Arkansas
 Independence County Arkansas
 Izard County Arkansas
 Jackson County Arkansas
 Jefferson County Arkansas
 Johnson County Arkansas
 Lafayette County Arkansas
 Lawrence County Arkansas
 Lee County Arkansas
 Lincoln County Arkansas
 Little River County Arkansas
 Logan County Arkansas
 Lonoke County Arkansas
 Madison County Arkansas
 Marion County Arkansas
 Miller County Arkansas
 Mississippi County Arkansas
 Monroe County Arkansas
 Montgomery County Arkansas
 Nevada County Arkansas
 Newton County Arkansas
 Ouachita County Arkansas
 Perry County Arkansas
 Phillips County Arkansas
 Pike County Arkansas
 Poinsett County Arkansas
 Polk County Arkansas
 Pope County Arkansas
 Prairie County Arkansas
 Pulaski County Arkansas
 Randolph County Arkansas
 Saint Francis County Arkansas
 Saline County Arkansas
 Scott County Arkansas
 Searcy County Arkansas
 Sebastian County Arkansas
 Sevier County Arkansas
 Sharp County Arkansas
 Stone County Arkansas
 Union County Arkansas
 Van Buren County Arkansas
 Washington County Arkansas
 White County Arkansas
 Woodruff County Arkansas
 Yell County Arkansas
RTArkansas Novaculite
 Arkansas River
 Arkansas River valley
 Arkoma Basin
 Atoka Formation
 Bent
Arkansas City Kansas  search
BTUnited States
 .Kansas
 ..Cowley County Kansas
 ...Arkansas City Kansas
SNCity in S Kansas.
Arkansas County Arkansas  search
BTUnited States
 .Arkansas
 ..Arkansas County Arkansas
Arkansas Novaculite  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...upper Paleozoic
 ....Arkansas Novaculite
RTDevonian
 Mississippian
 Oklahoma
 Arkansas
SNDevonian and Mississippian. SW Arkansas and SE Oklahoma. Indexed with ages as applicable. Added to Thesaurus in 1985.
Arkansas River  search
BTUnited States
 .Arkansas River
RTOklahoma
 Colorado
 Mississippi
 Kansas
 Arkansas
SNS central U.S., flows 1, 450 mi. generally ESE from the Rocky Mountains of central Colorado, through Kansas, Oklahoma, and Arkansas, to Mississippi River N of Greenville, Mississippi. Also search Arkansas River valley. Indexed with states as applicable.
Arkansas River valley  search
BTUnited States
 .Arkansas River valley
RTOklahoma
 Colorado
 Kansas
 Arkansas
SNIndexed with states as applicable.
Arkansas River#Arkansas River valley#Bald Mountain#Battle Mountain#Benton Format  search
Arkhangelsk Russian Federation  search
BTCommonwealth of Independent States
 .Russian Federation
 ..Arkhangelsk Russian Federation
BTEurope
 .Arkhangelsk Russian Federation
NTBelozero Russian Federation
 Franz Josef Land
 Mezen Russian Federation
 Nenets Russian Federation
 Novaya Zemlya
 Onega Russian Federation
 Vetrenyy Ridge
UFArchangel Russian Federation
RTBelaya Gora Russian Federation
 Mezen River basin
 Northern Dvina River
SNCity and oblast on the White Sea in NW Russian Federation. Before 1993, Arkhangelsk Russian Republic was also used. This term has multiple hierarchies.
Arkoma Basin  search
BTUnited States
 .Arkoma Basin
RTOklahoma
 Arkansas
 Spiro Sandstone
SNIndexed with states as applicable.
arkose  search
BTsedimentary rocks
 .clastic rocks
 ..arkose
RTsandstone
 terrigenous materials
 arkosic composition
 meta-arkose
 subarkose
arkosic composition  search
RTarkose
 sedimentary rocks
 sediments
 composition
SNBefore 1978, also search arkosic AND specific sediment type or sedimentary rock.
Arlan  search
RTBashkortostan Russian Federation
SNOil bearing region in Bashkortostan in S Urals. Indexed with region as applicable.
Arlington County Virginia  search
BTUnited States
 .Virginia
 ..Arlington County Virginia
SNN Virginia. Along Potomac River opposite Washington, D.C. Also search Alexandria Virginia if applicable.
armalcolite  search
BToxides
 .armalcolite
RTtitanium oxides
 pseudobrookite
Armenia  search
BTEurope
 .Armenia
BTCommonwealth of Independent States
 .Armenia
NTAgarak
 Akhtala Armenia
 Alaverdi Armenia
 Arteni
 Dastakert Armenia
 Kadzharan Armenia
 Kafan Armenia
 Lake Sevan
 Megri Armenia
 Megrinskiy Pluton
 Pambak Armenia
 Razdan River
 Sevan Armenia
 Shamlug Armenia
 Sisian Armenia
 Yerevan Armenia
 Zod Armenia
RTAragats
 Lesser Caucasus
 Caucasus
 Oktemberyan Series
 Shakhdag Range
 Spitak earthquake 1988
 Transcaucasia
 Zangezur
SNFormerly the Armenian Soviet Socialist Republic. This term has multiple hierarchies.
Armenia earthquake 1988  search
USESpitak earthquake 1988
Armidale Australia  search
BTAustralasia
 .Australia
 ..New South Wales Australia
 ...Armidale Australia
SNTown in NE New South Wales.
armored mud balls  search
BTsedimentary structures
 .secondary structures
 ..armored mud balls
UFmud balls, armored
RTclay
Armorica  search
USEArmorican Massif
Armorican Massif  search
BTEurope
 .Western Europe
 ..France
 ...Armorican Massif
UFArmorica
RTCadomian Orogeny
SNNW France.
Armstrong County Pennsylvania  search
BTUnited States
 .Pennsylvania
 ..Armstrong County Pennsylvania
SNW Pennsylvania.
Armstrong County Texas  search
BTUnited States
 .Texas
 ..Armstrong County Texas
SNExtreme N Texas.
Arno River basin  search
BTEurope
 .Southern Europe
 ..Italy
 ...Tuscany Italy
 ....Arno River basin
SNN central Tuscany.
aromatic hydrocarbons  search
BTorganic compounds
 .hydrocarbons
 ..aromatic hydrocarbons
NTbenzene
 BTEX
 ethylbenzene
 hopanoids
 oleananes
 polycyclic aromatic hydrocarbons
 toluene
 xylene
UFarenes
RTchlorobenzene
 hexachlorobenzene
 aliphatic hydrocarbons
 biomarkers
 aromatization
 soil vapor extraction
 soil venting
SNBefore 1978, search (aromatic or aromatics) AND hydrocarbons.
aromatization  search
RTaromatic hydrocarbons
 hydrocarbons
 petroleum
 processes
 production
SNAdded to Thesaurus in 1989.
Aroostook County Maine  search
BTUnited States
 .Maine
 ..Aroostook County Maine
NTPresque Isle Maine
RTSaint John River
SNN Maine.
Arosa Bay  search
BTEurope
 .Southern Europe
 ..Iberian Peninsula
 ...Spain
 ....Galicia Spain
 .....Arosa Bay
RTLa Coruna Spain
 Pontevedra Spain
SNOn the Atlantic Ocean in W between provinces of La Coruna and Pontevedra. Indexed with provinces.
Arran  search
RTFirth of Clyde
 Strathclyde region Scotland
SNIsland in Firth of Clyde in SW Scotland. Before 1975, it was included in Buteshire. Indexed with Strathclyde region Scotland if applicable.
arrays  search
RTcomputer networks
 electrical methods
 geophysical methods
 geophysical surveys
 LASA
 networks
 NORESS
 NORSAR
 PANDA
 PASSCAL
 portable arrays
 Schlumberger methods
 seismic networks
 SMART2
 TERRAscope
arrival time  search
RTdip moveout
 earthquakes
 elastic waves
 moveout
 normal moveout
 ray tracing
 raypaths
 seismic migration
 seismology
Arrow Canyon Range  search
BTUnited States
 .Nevada
 ..Arrow Canyon Range
Arroyo El Mimbral  search
BTMexico
 .Tamaulipas Mexico
 ..Arroyo El Mimbral
UFEl Mimbral, Arroyo
 Mimbral, Arroyo El
RTK-T boundary
SNStream which drains the southwest flank of the Sierra de Tamaulipas, NE Mexico. It is the site of a well-studied K-T boundary outcrop.
arroyos  search
BTfluvial features
 .arroyos
BTerosion features
 .arroyos
RTgeomorphology
 wadis
 ephemeral streams
 gullies
SNThis term has multiple hierarchies.
arsenates  search
NTadamite
 austinite
 beudantite
 conichalcite
 haidingerite
 legrandite
 mimetite
 pharmacolite
 pharmacosiderite
 scorodite
RTminerals
arsenic  search
BTmetals
 .arsenic
UFAs
RTnative elements
 arsenic ores
 arsenopyrite
 chalcophile elements
SNChemical element. Use arsenic ores for arsenic as a commodity.
arsenic ores  search
BTmetal ores
 .arsenic ores
RTnative elements
 arsenic
 arsenopyrite
SNCommodity. See List C.
arsenical pyrites  search
USEarsenopyrite
arsenides  search
NTarsenopyrite
 cobaltite
 gersdorffite
 lollingite
 maucherite
 niccolite
 pararammelsbergite
 rammelsbergite
 safflorite
 skutterudite
 sperrylite
RTminerals
arsenites  search
NTmixite
RTminerals
arsenopyrite  search
BTsulfides
 .arsenopyrite
BTarsenides
 .arsenopyrite
UFarsenical pyrites
 white pyrites
RTarsenic
 arsenic ores
 lollingite
SNThis term has multiple hierarchies.
arsenosulfides  search
BTsulfides
 .arsenosulfides
Arsia Mons  search
BTMars
 .Arsia Mons
RTvolcanoes
 Tharsis
 Tharsis Montes
SNVolcano on Mars. Added to Thesaurus in 1985.
art  search
RTarchaeology
 artifacts
 graphic methods
 petroglyphs
SNAlso search specific types such as cave art or parietal art if applicable. Added to Thesaurus in 1995.
Artemisia  search
BTPlantae
 .Spermatophyta
 ..Angiospermae
 ...Dicotyledoneae
 ....Artemisia
RTpalynomorphs
 miospores
SNGenus.
Artemovsk Ukraine  search
BTEurope
 .Ukraine
 ..Artemovsk Ukraine
UFBakhmut Ukraine
SNCity in the Donets Basin. This term has multiple hierarchies.
Arteni  search
BTEurope
 .Armenia
 ..Arteni
SNRegion in Armenia. This term has multiple hierarchies.
artesian waters  search
RTaquifers
 aquitards
 confined aquifers
 ground water
 hydrogeology
 water
 water resources
Arthabaska County Quebec  search
BTCanada
 .Eastern Canada
 ..Quebec
 ...Arthabaska County Quebec
Arthrodira  search
BTChordata
 .Vertebrata
 ..Pisces
 ...Placodermi
 ....Arthrodira
SNOrder.
Arthropoda  search
BTInvertebrata
 .Arthropoda
NTChelicerata
 Mandibulata
 Trilobitomorpha
RTcuticles
 segmentation
 Tardigrada
Arthur County Nebraska  search
BTUnited States
 .Nebraska
 ..Arthur County Nebraska
Arthur Harbor  search
RTAntarctica
 Anvers Island
SNOn Anvers Island. Off NW Antarctic Peninsula. Indexed with regions as applicable.
Articulata  search
BTInvertebrata
 .Brachiopoda
 ..Articulata
NTDictyonellidina
 Orthida
 Pentamerida
 Rhynchonellida
 Spiriferida
 Strophomenida
 Terebratulida
 Thecideidina
RTInarticulata
SNRestricted to use with Brachiopoda. Articulata is not to be used as post-Paleozoic Crinoidea subclass or with other organisms.
Articulatae  search
BTPlantae
 .Pteridophyta
 ..Sphenopsida
 ...Articulatae
RTSphenopteris
artifacts  search
UFpottery
RTarchaeology
 fossil man
 archaeological sites
 art
 Clovis
 petroglyphs
SNBefore 1993, also search tools AND archaeology.
artificial  search
SNA valid term through 1977. After 1977, use artificial recharge, artificial islands, artificial intelligence, or synthetic materials if applicable.
artificial intelligence  search
RTdata processing
 expert systems
 neural networks
 self-organization
SNAdded to Thesaurus in 1989.
artificial islands  search
UFman-made islands
RTreclamation
 sedimentation
 engineering geology
 barrier islands
 marine installations
 shorelines
 stabilization
 submarine installations
SNOften used in sedimentation, shore protection, and reclamation. Added to Thesaurus in 1993.
artificial minerals  search
SNNot a valid index term for GeoRef. Use synthetic materials and specific mineral name.
artificial recharge  search
RTfluid injection
 ground water
 injection
 natural recharge
 recharge
 reinjection wells
SNAlso search artificial AND recharge.
artificial wetlands  search
USEconstructed wetlands
artinite  search
BTcarbonates
 .artinite
Artinskian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Permian
 ....Cisuralian
 .....Artinskian
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Permian
 ....Lower Permian
 .....Artinskian
SNEurope. Above Sakmarian, below Kungurian.
Artiodactyla  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Mammalia
 ....Theria
 .....Eutheria
 ......Artiodactyla
NTHippopotamidae
 Ruminantia
 Suiformes
RTUngulata
SNOrder.
Artois  search
BTEurope
 .Western Europe
 ..France
 ...Artois
SNHistoric region in extreme N France, located to the S and SW of Flanders.
Arunachal Pradesh India  search
BTAsia
 .Indian Peninsula
 ..India
 ...Northeastern India
 ....Arunachal Pradesh India
RTHimalayas
SNState India, NE of Assam.
Arunta Block  search
BTAustralasia
 .Australia
 ..Northern Territory Australia
 ...Arunta Block
RTArunta Complex
SNNorthern Territory, central Australia. Added to Thesaurus in 1989.
Arunta Complex  search
BTChronostratigraphic Units
 .Precambrian
 ..Archean
 ...Arunta Complex
RTAustralia
 Northern Territory Australia
 Arunta Block
Arve Valley  search
BTEurope
 .Arve Valley
RTSwitzerland
 France
SNRiver valley. Indexed with countries as applicable.
Arvicolidae  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Mammalia
 ....Theria
 .....Eutheria
 ......Rodentia
 .......Myomorpha
 ........Arvicolidae
RTMimomys
SNIn some classifications, sometimes includes some genera from the family Cricetidae.