Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
Ar  | |
|---|---|
| USE | argon |
| ar River basin#Bear River Formation#Bear River Range#Beaver River#Bird Spring Fo |
|---|
| Ar-36 | |
|---|---|
| BT | isotopes |
| .stable isotopes | |
| ..Ar-36 | |
| BT | noble gases |
| .argon | |
| ..Ar-36 | |
| RT | Ar-38/Ar-36 |
| Ar-40/Ar-36 | |
| SN | This term has multiple hierarchies. |
| Ar-36/Ar-38 | |
|---|---|
| USE | Ar-38/Ar-36 |
| Ar-36/Ar-40 | |
|---|---|
| USE | Ar-40/Ar-36 |
| Ar-37 | |
|---|---|
| BT | isotopes |
| .radioactive isotopes | |
| ..Ar-37 | |
| BT | noble gases |
| .argon | |
| ..Ar-37 | |
| SN | Artificial. This term has multiple hierarchies. |
| Ar-38 | |
|---|---|
| BT | isotopes |
| .radioactive isotopes | |
| ..Ar-38 | |
| BT | noble gases |
| .argon | |
| ..Ar-38 | |
| RT | Ar-38/Ar-36 |
| SN | This term has multiple hierarchies. |
| Ar-38/Ar-36 | |
|---|---|
| BT | isotopes |
| .radioactive isotopes | |
| ..Ar-38/Ar-36 | |
| BT | isotopes |
| .stable isotopes | |
| ..Ar-38/Ar-36 | |
| BT | noble gases |
| .argon | |
| ..Ar-38/Ar-36 | |
| UF | Ar-36/Ar-38 |
| RT | isotope ratios |
| Ar-36 | |
| Ar-38 | |
| SN | This term has multiple hierarchies. |
| Ar-39 | |
|---|---|
| BT | isotopes |
| .radioactive isotopes | |
| ..Ar-39 | |
| BT | noble gases |
| .argon | |
| ..Ar-39 | |
| RT | Ar-40/Ar-39 |
| SN | Artificial. This term has multiple hierarchies. |
| Ar-39/Ar-40 | |
|---|---|
| USE | Ar-40/Ar-39 |
| Ar-40 | |
|---|---|
| BT | isotopes |
| .stable isotopes | |
| ..Ar-40 | |
| BT | noble gases |
| .argon | |
| ..Ar-40 | |
| RT | Ar-40/Ar-36 |
| Ar-40/Ar-39 | |
| SN | This term has multiple hierarchies. |
| Ar-40/Ar-36 | |
|---|---|
| BT | isotopes |
| .stable isotopes | |
| ..Ar-40/Ar-36 | |
| BT | noble gases |
| .argon | |
| ..Ar-40/Ar-36 | |
| UF | Ar-36/Ar-40 |
| RT | isotope ratios |
| Ar-36 | |
| Ar-40 | |
| SN | This term has multiple hierarchies. |
| Ar-40/Ar-39 | |
|---|---|
| BT | isotopes |
| .radioactive isotopes | |
| ..Ar-40/Ar-39 | |
| BT | isotopes |
| .stable isotopes | |
| ..Ar-40/Ar-39 | |
| BT | noble gases |
| .argon | |
| ..Ar-40/Ar-39 | |
| UF | Ar-39/Ar-40 |
| RT | isotope ratios |
| Ar-39 | |
| Ar-40 | |
| SN | This term has multiple hierarchies. |
| Ar/Ar | |
|---|---|
| UF | argon-argon |
| RT | absolute age |
| isotope ratios | |
| thermochronology | |
| argon | |
| SN | Isotopic ratio used in age determination. |
| Arab Formation | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Mesozoic | |
| ...Jurassic | |
| ....Upper Jurassic | |
| .....Arab Formation | |
| RT | United Arab Emirates |
| Saudi Arabia | |
| SN | Added to Thesaurus in 1989. |
| Arabia | |
|---|---|
| SN | Not a valid term for GeoRef. See Arabian Peninsula, Saudi Arabia, or Arabia Regio for the Martian feature. |
| Arabia Regio | |
|---|---|
| BT | Mars |
| .Arabia Regio | |
| SN | Albedo feature. |
| Arabian Desert | |
|---|---|
| USE | Eastern Desert |
| Arabian Gulf | |
|---|---|
| USE | Persian Gulf |
| Arabian Peninsula | |
|---|---|
| BT | Asia |
| .Arabian Peninsula | |
| NT | Arabian Shield |
| Bahrain | |
| Kuwait | |
| Oman | |
| Qatar | |
| Saudi Arabia | |
| United Arab Emirates | |
| Yemen | |
| RT | Middle East |
| Red Sea Rift | |
| SN | Between 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 | |
|---|---|
| RT | plate tectonics |
| plates | |
| Saudi Arabia | |
| SN | Indexed with geographic area and/or age as applicable. |
| Arabian Ridge | |
|---|---|
| USE | Carlsberg Ridge |
| Arabian Sea | |
|---|---|
| BT | Indian Ocean |
| .Arabian Sea | |
| NT | Gulf of Aden |
| Gulf of Cambay | |
| Gulf of Oman | |
| Indus Fan | |
| Persian Gulf | |
| RT | DSDP 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 | |
| SN | Between the Arabian Peninsula on the W and Pakistan and India in the E. |
| Arabian Shield | |
|---|---|
| BT | Asia |
| .Arabian Peninsula | |
| ..Arabian Shield | |
| RT | Yemen |
| Saudi Arabia | |
| SN | NE part of the Ethiopian Shield. Indexed with countries as applicable. |
| Arabian-Indian Midoceanic Ridge | |
|---|---|
| USE | Carlsberg Ridge |
| Arabian-Indian Ridge | |
|---|---|
| USE | Carlsberg Ridge |
| Arabian-Nubian Shield | |
|---|---|
| SN | Not a valid term for GeoRef. Use Arabian Shield or Nubian Shield or both as applicable. |
| Arabic | |
|---|---|
| RT | catalogs |
| dictionaries | |
| glossaries | |
| lexicons | |
| SN | Used for studies about the language. |
| Aracaju Brazil | |
|---|---|
| BT | South America |
| .Brazil | |
| ..Sergipe Brazil | |
| ...Aracaju Brazil | |
| SN | City on the Atlantic Ocean in NE Brazil. |
| Aracena Spain | |
|---|---|
| BT | elva Spain |
| .Aracena Spain | |
| SN | Town near the Gulf of Cadiz. |
| Arachnida | |
|---|---|
| BT | Invertebrata |
| .Arthropoda | |
| ..Chelicerata | |
| ...Arachnida | |
| SN | Class. |
| Arad Romania | |
|---|---|
| BT | Europe |
| .Southern Europe | |
| ..Banat | |
| ...Arad Romania | |
| BT | Europe |
| .Southern Europe | |
| ..Romania | |
| ...Arad Romania | |
| SN | City and county near the Hungarian border. This term has multiple hierarchies. |
| Araeoscelidia | |
|---|---|
| BT | Chordata |
| .Vertebrata | |
| ..Tetrapoda | |
| ...Reptilia | |
| ....Diapsida | |
| .....Araeoscelidia | |
| RT | Trilophosauria |
| SN | Order. Before 1993, Trilophosauria was a narrower term. |
| Arafura Sea | |
|---|---|
| BT | Pacific Ocean |
| .South Pacific | |
| ..Southwest Pacific | |
| ...Arafura Sea | |
| RT | Australia |
| Indonesia | |
| McArthur Basin | |
| Torres Strait | |
| SN | Sea between N Australia and Indonesia; 800 miles long by about 350 miles wide. This term has multiple hierarchies. |
| Aragats | |
|---|---|
| RT | Armenia |
| Lesser Caucasus | |
| SN | A mountain in NW Armenia. Indexed with regions and mountains as applicable. |
| Aragon Spain | |
|---|---|
| BT | Europe |
| .Southern Europe | |
| ..Iberian Peninsula | |
| ...Spain | |
| ....Aragon Spain | |
| NT | Huesca Spain |
| Saragossa Spain | |
| Teruel Spain | |
| SN | Region and ancient kingdom in NE Spain. |
| aragonite | |
|---|---|
| BT | carbonates |
| .aragonite | |
| RT | alabaster |
| calcite | |
| calcium carbonate | |
| pearls | |
| witherite | |
| Aragua Venezuela | |
|---|---|
| BT | South America |
| .Venezuela | |
| ..Aragua Venezuela | |
| SN | State in N Venezuela. |
| Aragva River | |
|---|---|
| USE | Aragvi River |
| Aragvi River | |
|---|---|
| BT | Europe |
| .Georgian Republic | |
| ..Aragvi River | |
| UF | Aragva River |
| SN | N central Georgian Republic. |
| Aral region | |
|---|---|
| BT | Commonwealth of Independent States |
| .Aral region | |
| BT | Asia |
| .Central Asia | |
| ..Aral region | |
| UF | Aral Sea region |
| RT | Kazakhstan |
| Uzbekistan | |
| Turkmenia | |
| SN | Before 1978, also search Aral. This term has multiple hierarchies. Indexed with former Soviet republics as applicable. |
| Aral Sea | |
|---|---|
| BT | Commonwealth of Independent States |
| .Aral Sea | |
| BT | Asia |
| .Central Asia | |
| ..Aral Sea | |
| RT | Barsakelmes |
| SN | Between Kazakhstan and Uzbekistan. Also search Aral. This term has multiple hierarchies. |
| Aral Sea region | |
|---|---|
| USE | Aral region |
| Aransas County Texas | |
|---|---|
| BT | United States |
| .Texas | |
| ..Aransas County Texas | |
| Arapahoe County Colorado | |
|---|---|
| BT | United States |
| .Colorado | |
| ..Arapahoe County Colorado | |
| SN | S and SE of Denver in N central Colorado. |
| Arapien Shale | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Mesozoic | |
| ...Jurassic | |
| ....Arapien Shale | |
| RT | Utah |
| SN | Central Utah. Added to Thesaurus in 1985. |
| Ararat | |
|---|---|
| RT | Turkey |
| SN | Mountain 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 | |
|---|---|
| BT | South America |
| .Brazil | |
| ..Araripe Basin | |
| RT | Ceara Brazil |
| Pernambuco Brazil | |
| SN | NE Brazil. Indexed with states as applicable. |
| Arauco Chile | |
|---|---|
| BT | South America |
| .Chile | |
| ..Arauco Chile | |
| SN | Former province in S central Chile. |
| Arava rift valley | |
|---|---|
| USE | Arava Valley |
| Arava Valley | |
|---|---|
| BT | Asia |
| .Middle East | |
| ..Arava Valley | |
| UF | Arava rift valley |
| RT | Red Sea Rift |
| Israel | |
| Jordan | |
| SN | Part 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 | |
|---|---|
| USE | Aravalli System |
| Aravalli Range | |
|---|---|
| BT | Asia |
| .Indian Peninsula | |
| ..India | |
| ...Rajasthan India | |
| ....Aravalli Range | |
| RT | Khetri copper belt |
| SN | Central and S Rajasthan, NW India. |
| Aravalli Supergroup | |
|---|---|
| USE | Aravalli System |
| Aravalli System | |
|---|---|
| BT | Chronostratigraphic Units |
| .Precambrian | |
| ..Archean | |
| ...Aravalli System | |
| UF | Aravalli Group |
| Aravalli Supergroup | |
| RT | India |
| Rajasthan India | |
| Gujarat India | |
| Andhra Pradesh India | |
| Mattoon Formation | |
| SN | Includes Dabari, Matoon, and Udaipur formations. |
| Araxa Brazil | |
|---|---|
| BT | South America |
| .Brazil | |
| ..Minas Gerais Brazil | |
| ...Araxa Brazil | |
| SN | Town in W Minas Gerais. |
| Araya Peninsula | |
|---|---|
| BT | South America |
| .Venezuela | |
| ..Sucre Venezuela | |
| ...Araya Peninsula | |
| SN | W Sucre. |
| Arbarastakh | |
|---|---|
| BT | Commonwealth of Independent States |
| .Russian Federation | |
| ..Yakutia Russian Federation | |
| ...Arbarastakh | |
| SN | Carbonatite complex in Yakutia. This term has multiple hierarchies. |
| Arbuckle Anticline | |
|---|---|
| BT | United States |
| .Oklahoma | |
| ..Arbuckle Anticline | |
| RT | Anadarko Basin |
| Arbuckle Mountains | |
| SN | Anadarko Basin, S Oklahoma. Added to Thesaurus in 1989. |
| Arbuckle Group | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Arbuckle Group | |
| RT | Lower Ordovician |
| Oklahoma | |
| Kindblade Formation | |
| Upper Cambrian | |
| SN | Upper 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 | |
|---|---|
| BT | United States |
| .Oklahoma | |
| ..Arbuckle Mountains | |
| RT | Arbuckle Anticline |
| Carter County Oklahoma | |
| Murray County Oklahoma | |
| Wichita Uplift | |
| SN | Carter and Murray counties, S central Oklahoma. |
| ARC/INFO | |
|---|---|
| RT | cartography |
| computer programs | |
| data processing | |
| geographic information systems | |
| information systems | |
| mapping | |
| models | |
| SN | Data model system for processing geographic information. |
| Arcachon Basin | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..France | |
| ...Gironde France | |
| ....Arcachon Basin | |
| RT | Bay of Biscay |
| SN | Inlet of Bay of Biscay in SW France. |
| arch dams | |
|---|---|
| BT | dams |
| .arch dams | |
| UF | archdams |
| Archaean | |
|---|---|
| USE | Archean |
| Archaediscidae | |
|---|---|
| BT | microfossils |
| .Fusulinina | |
| ..Archaediscidae | |
| SN | Family. This term has multiple hierarchies. |
| Archaeoceti | |
|---|---|
| BT | Chordata |
| .Vertebrata | |
| ..Tetrapoda | |
| ...Mammalia | |
| ....Theria | |
| .....Eutheria | |
| ......Cetacea | |
| .......Archaeoceti | |
| SN | Suborder. |
| Archaeocopida | |
|---|---|
| USE | Archeocopida |
| Archaeocyatha | |
|---|---|
| BT | Invertebrata |
| .Archaeocyatha | |
| Archaeogastropoda | |
|---|---|
| BT | Invertebrata |
| .Mollusca | |
| ..Gastropoda | |
| ...Archaeogastropoda | |
| NT | Bellerophontina |
| Archaeolithothamnium | |
|---|---|
| BT | Plantae |
| .algae | |
| ..Rhodophyta | |
| ...Corallinaceae | |
| ....Archaeolithothamnium | |
| RT | microfossils |
| SN | Indexed with microfossils if applicable. |
| archaeological sites | |
|---|---|
| UF | sites, archaeological |
| RT | archaeology |
| fossil man | |
| artifacts | |
| geologic sites | |
| middens | |
| Archaeomonadaceae | |
|---|---|
| BT | Invertebrata |
| .Protista | |
| ..ebridians | |
| ...Archaeomonadaceae | |
| RT | microfossils |
| SN | Indexed with microfossils if applicable. |
| Archaeopteris | |
|---|---|
| BT | Plantae |
| .Pteridophyta | |
| ..Filicopsida | |
| ...Archaeopteris | |
| SN | Genus. |
| Archaeopteryx | |
|---|---|
| BT | Chordata |
| .Vertebrata | |
| ..Tetrapoda | |
| ...Aves | |
| ....Archaeornithes | |
| .....Archaeopteryx | |
| SN | Genus. |
| Archaeornithes | |
|---|---|
| BT | Chordata |
| .Vertebrata | |
| ..Tetrapoda | |
| ...Aves | |
| ....Archaeornithes | |
| NT | Archaeopteryx |
| RT | Neornithes |
| SN | Subclass. |
| Archaeozoic | |
|---|---|
| USE | Archean |
| Archangel Russian Federation | |
|---|---|
| USE | Arkhangelsk Russian Federation |
| archdams | |
|---|---|
| USE | arch dams |
| Archeocopida | |
|---|---|
| BT | microfossils |
| .Archeocopida | |
| BT | Invertebrata |
| .Arthropoda | |
| ..Mandibulata | |
| ...Crustacea | |
| ....Ostracoda | |
| .....Archeocopida | |
| UF | Archaeocopida |
| SN | Order. This term has multiple hierarchies. |
| archeology | |
|---|---|
| USE | archaeology |
| Archeozoic | |
|---|---|
| USE | Archean |
| Archer County Texas | |
|---|---|
| BT | United States |
| .Texas | |
| ..Archer County Texas | |
| arches | |
|---|---|
| RT | abutments |
| anticlines | |
| arcuate structures | |
| domes | |
| folds | |
| swells | |
| tectonics | |
| Arches National Park | |
|---|---|
| BT | United States |
| .Utah | |
| ..Arches National Park | |
| RT | national parks |
| SN | In SE Utah. Before 1981, also search Arches and Utah. Added to Thesaurus in 1981. |
| Archie equation | |
|---|---|
| USE | Archie's law |
| Archie's law | |
|---|---|
| UF | Archie equation |
| RT | petroleum engineering |
| well-logging | |
| equations | |
| mathematical methods | |
| resistivity | |
| formation evaluation | |
| porosity | |
| reservoirs | |
| SN | Equation 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 | |
|---|---|
| BT | Chordata |
| .Vertebrata | |
| ..Tetrapoda | |
| ...Reptilia | |
| ....Diapsida | |
| .....Archosauria | |
| NT | Crocodilia |
| Ornithischia | |
| Pterosauria | |
| Saurischia | |
| Thecodontia | |
| SN | Subclass. Archosauromorpha is considered a broader term. |
| Archostemata | |
|---|---|
| BT | Invertebrata |
| .Arthropoda | |
| ..Mandibulata | |
| ...Insecta | |
| ....Pterygota | |
| .....Neoptera | |
| ......Endopterygota | |
| .......Coleoptera | |
| ........Archostemata | |
| SN | Suborder. |
| Archuleta County Colorado | |
|---|---|
| BT | United States |
| .Colorado | |
| ..Archuleta County Colorado | |
| SN | On New Mexico border in SW Colorado. |
| Arcina | |
|---|---|
| BT | Invertebrata |
| .Mollusca | |
| ..Bivalvia | |
| ...Arcina | |
| RT | Cyrtodontida |
| arcs | |
|---|---|
| SN | As of 1993, no longer a valid term for GeoRef. Usually out-of-scope. Used with electrical field. See arcuate structures. |
| arcs, island | |
|---|---|
| USE | island arcs |
| Arctic | |
|---|---|
| SN | Not a valid GeoRef index term after 1969. |
| Arctic America | |
|---|---|
| SN | Now use Alaska, Yukon Territory or Northwest Territories as applicable. See also Arctic Archipelago. |
| Arctic Archipelago | |
|---|---|
| BT | Canada |
| .Northwest Territories | |
| ..Franklin District Northwest Territories | |
| ...Arctic Archipelago | |
| UF | Arctic Islands |
| RT | Arctic Coastal Plain |
| Arctic region | |
| Queen Elizabeth Islands | |
| Baffin Island | |
| Banks Island | |
| Bathurst Island | |
| Ellesmere Island | |
| Victoria Island | |
| SN | Large group of islands in the Arctic Ocean nearly coextensive with Franklin District, Northwest Territories, Canada. |
| Arctic Coastal Plain | |
|---|---|
| BT | Arctic region |
| .Arctic Coastal Plain | |
| RT | Russian Federation |
| Greenland | |
| Alaska | |
| Arctic Archipelago | |
| Arctic National Wildlife Refuge | |
| Jan Mayen | |
| North Slope | |
| Northern Alaska | |
| Northwest Territories | |
| Svalbard | |
| SN | Indexed with countries or regions as applicable. |
| arctic environment | |
|---|---|
| RT | climate |
| depositional environment | |
| ecology | |
| marine environment | |
| paleoclimatology | |
| paleoecology | |
| terrestrial environment | |
| SN | Before 1978, also search arctic. |
| Arctic Islands | |
|---|---|
| USE | Arctic Archipelago |
| Arctic National Wildlife Refuge | |
|---|---|
| BT | United States |
| .Alaska | |
| ..Northern Alaska | |
| ...Arctic National Wildlife Refuge | |
| UF | ANWR |
| RT | Arctic Coastal Plain |
| Arctic region | |
| Sadlerochit Mountains | |
| SN | Arctic Coastal Plain of NE Alaska. Added to Thesaurus in 1989. |
| Arctic Ocean | |
|---|---|
| NT | Alpha 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 | |
| UF | Arctic Sea |
| North Polar Sea | |
| RT | Arctic 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 | |
| SN | Extends 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 | |
|---|---|
| NT | Arctic Coastal Plain |
| Greenland | |
| Jan Mayen | |
| North Pole | |
| Russian Arctic | |
| Svalbard | |
| RT | Alaska |
| 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 | |
| SN | The 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 | |
|---|---|
| USE | Arctic Ocean |
| Arctocyonia | |
|---|---|
| BT | Chordata |
| .Vertebrata | |
| ..Tetrapoda | |
| ...Mammalia | |
| ....Theria | |
| .....Eutheria | |
| ......Condylarthra | |
| .......Arctocyonia | |
| arcuate faults | |
|---|---|
| BT | faults |
| .arcuate faults | |
| RT | arcuate structures |
| boundary faults | |
| peripheral faults | |
| SN | Before 1978, also search arcuate AND faults. |
| arcuate structures | |
|---|---|
| RT | arches |
| arcuate faults | |
| coronae | |
| fold and thrust belts | |
| greenstone belts | |
| island arcs | |
| ring structures | |
| SN | General. Use more specific term if applicable. Added to Thesaurus in 1993. |
| Ardara Pluton | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..Ireland | |
| ...Donegal Ireland | |
| ....Ardara Pluton | |
| SN | An igneous intrusion in NW Ireland. |
| Ardeche France | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..France | |
| ...Ardeche France | |
| NT | Largentiere France |
| Privas France | |
| RT | Cevennes |
| Juvinas Meteorite | |
| Vivarais | |
| SN | Department in S France. |
| Ardennes | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..Ardennes | |
| UF | Forest of Ardennes |
| RT | Ardennes France |
| Givet France | |
| Hohe Venn | |
| Luxembourg | |
| Luxembourg Belgium | |
| Rhenish Schiefergebirge | |
| Rocroi France | |
| Sedan France | |
| Stavelot Belgium | |
| SN | Wooded plateau region. Indexed with countries as applicable. |
| Ardennes Department France | |
|---|---|
| USE | Ardennes France |
| Ardennes France | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..France | |
| ...Ardennes France | |
| NT | Givet France |
| Rocroi France | |
| Sedan France | |
| UF | Ardennes Department France |
| RT | Ardennes |
| SN | Department in NE France. Before 1981, also search Ardennes. |
| Ardmore Basin | |
|---|---|
| BT | United States |
| .Ardmore Basin | |
| RT | Oklahoma |
| Texas | |
| SN | S Oklahoma and N Texas. Indexed with states as applicable. Added to Thesaurus in 1985. |
| Ardnamurchan | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..United Kingdom | |
| ...Great Britain | |
| ....Scotland | |
| .....Argyllshire Scotland | |
| ......Ardnamurchan | |
| BT | Europe |
| .Western Europe | |
| ..United Kingdom | |
| ...Great Britain | |
| ....Scotland | |
| .....Highland region Scotland | |
| ......Ardnamurchan | |
| SN | Peninsula and parish in Argyll County, N of Mull Island in W Scotland. This term has multiple hierarchies. |
| arduinite | |
|---|---|
| USE | mordenite |
| Areado Formation | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Mesozoic | |
| ...Cretaceous | |
| ....Lower Cretaceous | |
| .....Areado Formation | |
| RT | Aptian |
| Brazil | |
| Minas Gerais Brazil | |
| areal geology | |
|---|---|
| RT | bibliography |
| expeditions | |
| explanatory text | |
| geology | |
| guidebook | |
| maps | |
| regional | |
| SN | Used 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) | |
|---|---|
| SN | Areal 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 | |
|---|---|
| SN | No longer a valid term for GeoRef. Before 1998, used with clay mineralogy. Used before 1973 as a general term. |
| areas described | |
|---|---|
| SN | Used in subfiles E and N. See areal geology; areal studies. |
| Arecibo Puerto Rico | |
|---|---|
| BT | Caribbean region |
| .West Indies | |
| ..Antilles | |
| ...Greater Antilles | |
| ....Puerto Rico | |
| .....Arecibo Puerto Rico | |
| SN | City in S Puerto Rico on Caribbean Sea. |
| Arecidae | |
|---|---|
| BT | Plantae |
| .Spermatophyta | |
| ..Angiospermae | |
| ...Monocotyledoneae | |
| ....Arecidae | |
| Arenac County Michigan | |
|---|---|
| BT | United States |
| .Michigan | |
| ..Michigan Lower Peninsula | |
| ...Arenac County Michigan | |
| arenaceous texture | |
|---|---|
| BT | textures |
| .arenaceous texture | |
| UF | arenarious texture |
| psammitic texture | |
| sabulous texture | |
| sandy texture | |
| RT | sedimentary rocks |
| sand | |
| sediments | |
| sandstone | |
| SN | Before 1978, also search arenaceous AND specific sediment type or sedimentary rock. |
| Arenal | |
|---|---|
| BT | Central America |
| .Costa Rica | |
| ..Arenal | |
| RT | volcanoes |
| SN | Volcano in NW Costa Rica. |
| arenarious texture | |
|---|---|
| USE | arenaceous texture |
| Arendal Norway | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..Scandinavia | |
| ...Norway | |
| ....Arendal Norway | |
| SN | A city on the Skagerrak. |
| arendalite | |
|---|---|
| USE | epidote |
| arenes | |
|---|---|
| USE | aromatic hydrocarbons |
| Arenicolites | |
|---|---|
| BT | ichnofossils |
| .Arenicolites | |
| RT | Vermes |
| burrows | |
| Arenig | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..United Kingdom | |
| ...Great Britain | |
| ....Wales | |
| .....Merionethshire Wales | |
| ......Arenig | |
| RT | Arenigian |
| SN | Two 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 | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Ordovician | |
| ....Lower Ordovician | |
| .....Arenigian | |
| NT | Ballantrae Complex |
| RT | Arenig |
| Buchans Group | |
| San Juan Formation | |
| SN | Europe. Above Tremadocian, below Llanvirnian. Before 1978, also search Arenig. |
| arenite | |
|---|---|
| BT | sedimentary rocks |
| .clastic rocks | |
| ..arenite | |
| NT | litharenite |
| quartz arenite | |
| sublitharenite | |
| RT | terrigenous materials |
| Arequipa Peru | |
|---|---|
| BT | South America |
| .Peru | |
| ..Arequipa Peru | |
| SN | Department in S Peru. Also a city. |
| Ares Vallis | |
|---|---|
| BT | Mars |
| .Ares Vallis | |
| RT | Mars Pathfinder Program |
| arfvedsonite | |
|---|---|
| BT | silicates |
| .chain silicates | |
| ..amphibole group | |
| ...clinoamphibole | |
| ....arfvedsonite | |
| Argentera Italy | |
|---|---|
| BT | Europe |
| .Southern Europe | |
| ..Italy | |
| ...Piemonte Italy | |
| ....Argentera Italy | |
| SN | Village in NW Italy. |
| Argentera Massif | |
|---|---|
| BT | Europe |
| .Southern Europe | |
| ..Italy | |
| ...Piemonte Italy | |
| ....Argentera Massif | |
| SN | S Piemonte. |
| Argenteuil County Quebec | |
|---|---|
| BT | Canada |
| .Eastern Canada | |
| ..Quebec | |
| ...Argenteuil County Quebec | |
| Argentiere Glacier | |
|---|---|
| BT | ute-Savoie France |
| .Argentiere Glacier | |
| RT | Mont Blanc |
| Pennine Alps | |
| SN | In the Mont Blanc Massif of the Pennine Alps. |
| Argentine Andes | |
|---|---|
| BT | South America |
| .Andes | |
| ..Argentine Andes | |
| BT | South America |
| .Argentina | |
| ..Argentine Andes | |
| SN | Region in Argentina. This term has multiple hierarchies. Added to Thesaurus in 1981. |
| Argentine Basin | |
|---|---|
| BT | Atlantic Ocean |
| .South Atlantic | |
| ..Argentine Basin | |
| RT | Vema Channel |
| DSDP Site 331 | |
| DSDP Site 358 | |
| Leg 39 | |
| SN | E of Argentina in SW Atlantic. |
| argentite | |
|---|---|
| BT | sulfides |
| .argentite | |
| UF | argyrite |
| RT | acanthite |
| silver ores | |
| silver | |
| Arges River | |
|---|---|
| BT | Europe |
| .Southern Europe | |
| ..Romania | |
| ...Arges River | |
| SN | In S Romania. |
| argillaceous rocks | |
|---|---|
| USE | argillaceous texture |
| argillaceous texture | |
|---|---|
| BT | textures |
| .argillaceous texture | |
| UF | argillaceous rocks |
| RT | clay mineralogy |
| sedimentary rocks | |
| clay minerals | |
| clay | |
| sediments | |
| argillite | |
| marl | |
| shale | |
| SN | Before 1978, also search argillaceous AND specific sediment type or sedimentary rock. |
| argillite | |
|---|---|
| BT | sedimentary rocks |
| .clastic rocks | |
| ..argillite | |
| UF | dropstone |
| RT | argillization |
| terrigenous materials | |
| argillaceous texture | |
| argillization | |
|---|---|
| BT | metasomatism |
| .argillization | |
| RT | processes |
| feldspar group | |
| clay minerals | |
| alteration | |
| argillite | |
| SN | Added to Thesaurus in 1989. |
| Argo abyssal plain | |
|---|---|
| BT | Indian Ocean |
| .Argo abyssal plain | |
| RT | DSDP Site 261 |
| Leg 123 | |
| ODP Site 765 | |
| SN | Eastern Indian Ocean. |
| Argolis Greece | |
|---|---|
| BT | Europe |
| .Southern Europe | |
| ..Greece | |
| ...Peloponnesus Greece | |
| ....Argolis Greece | |
| SN | Department in E Peloponnesus. |
| argon | |
|---|---|
| BT | noble gases |
| .argon | |
| NT | Ar-36 |
| Ar-37 | |
| Ar-38 | |
| Ar-38/Ar-36 | |
| Ar-39 | |
| Ar-40 | |
| Ar-40/Ar-36 | |
| Ar-40/Ar-39 | |
| UF | Ar |
| RT | Ar/Ar |
| isotopes | |
| K/Ar | |
| argon-argon | |
|---|---|
| USE | Ar/Ar |
| Argovian | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Mesozoic | |
| ...Jurassic | |
| ....Upper Jurassic | |
| .....Argovian | |
| SN | Europe. Substage in Great Britain: Upper Jurassic (lower Lusitanian; above Oxfordian Stage, below Rauracian Substage). |
| Argun Ri |
|---|
| Argun River | |
|---|---|
| RT | Amur River |
| Asia | |
| Europe | |
| Georgian Republic | |
| Greater Caucasus | |
| Russian Far East | |
| Russian Federation | |
| Shilka Valley | |
| Transbaikalia | |
| SN | Rises 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 | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..United Kingdom | |
| ...Great Britain | |
| ....Scotland | |
| .....Argyllshire Scotland | |
| NT | Ardnamurchan |
| Islay | |
| Kintyre | |
| Mull Island | |
| RT | Highland region Scotland |
| Ballachulish Complex | |
| Firth of Clyde | |
| Glen Coe | |
| Strathclyde region Scotland | |
| SN | Former 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 | |
|---|---|
| USE | argentite |
| Ariake Bay | |
|---|---|
| BT | Asia |
| .Far East | |
| ..Japan | |
| ...Kyushu | |
| ....Ariake Bay | |
| SN | On East China Sea on W coast of Kyushu. Also search Ariake Sea. |
| arid environment | |
|---|---|
| BT | terrestrial environment |
| .arid environment | |
| UF | arid regions |
| RT | ecology |
| geomorphology | |
| depositional environment | |
| land use | |
| climate | |
| subaerial environment | |
| paleoclimatology | |
| barchans | |
| deserts | |
| rock varnish | |
| sebkha environment | |
| semi-arid environment | |
| wadis | |
| yardangs | |
| SN | Before 1978, also search arid. |
| arid regions | |
|---|---|
| USE | arid environment |
| Arida-gawa | |
|---|---|
| BT | nshu |
| .Wakayama Japan | |
| ..Arida-gawa | |
| UF | Arita River |
| Aritagawa | |
| SN | W Kii Peninsula S of Osaka, S Honshu. Added to Thesaurus in 1993. |
| Aridisols | |
|---|---|
| BT | soils |
| .Aridisols | |
| RT | soil group |
| Ariege France | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..France | |
| ...Ariege France | |
| NT | Castillon Massif |
| Querigut Massif | |
| Saint-Girons France | |
| RT | Lherz |
| Salat Valley | |
| SN | Department in S France. |
| ariegite | |
|---|---|
| BT | igneous rocks |
| .plutonic rocks | |
| ..ultramafics | |
| ...ariegite | |
| RT | websterite |
| Ariel Satellite | |
|---|---|
| RT | icy satellites |
| satellites | |
| Uranus | |
| Voyager Program | |
| SN | One of the satellites of Uranus. Before 1989, also search Ariel AND Uranus. Added to Thesaurus in 1989. |
| Aries Valley | |
|---|---|
| BT | Europe |
| .Southern Europe | |
| ..Romania | |
| ...Transylvania | |
| ....Aries Valley | |
| SN | River valley in W central Transylvania. Also search Aries. |
| Arikaree Group | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Cenozoic | |
| ...Tertiary | |
| ....Arikaree Group | |
| RT | Wyoming |
| Montana | |
| Colorado | |
| lower Miocene | |
| upper Oligocene | |
| South Dakota | |
| White River Group | |
| SN | Upper 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 | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Cenozoic | |
| ...Tertiary | |
| ....Arikareean | |
| RT | lower Miocene |
| upper Oligocene | |
| Kirkwood Formation | |
| SN | Provincial series, North America. Indexed with ages as applicable. |
| Aristarchus | |
|---|---|
| BT | Moon |
| .Aristarchus | |
| UF | Aristarchus Plateau |
| RT | Apollo 17 |
| Ocean of Storms | |
| Sea of Rains | |
| SN | Lunar crater near Vallis Schroteri in region between Ocean of Storms and Sea of Rains. Added to Thesaurus in 1989. |
| Aristarchus Plateau | |
|---|---|
| USE | Aristarchus |
| Arita River | |
|---|---|
| USE | Arida-gawa |
| Aritagawa | |
|---|---|
| USE | Arida-gawa |
| Ariyalur India | |
|---|---|
| BT | Asia |
| .Indian Peninsula | |
| ..India | |
| ...Tamil Nadu India | |
| ....Ariyalur India | |
| SN | Town in S Tamil Nadu, S India. |
| Ariyalur Stage | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Mesozoic | |
| ...Cretaceous | |
| ....Upper Cretaceous | |
| .....Ariyalur Stage | |
| RT | India |
| SN | S India. |
| Arize Massif | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..France | |
| ...Arize Massif | |
| SN | N of the central Pyrenees. |
| Arkansas City Kansas | |
|---|---|
| BT | United States |
| .Kansas | |
| ..Cowley County Kansas | |
| ...Arkansas City Kansas | |
| SN | City in S Kansas. |
| Arkansas County Arkansas | |
|---|---|
| BT | United States |
| .Arkansas | |
| ..Arkansas County Arkansas | |
| Arkansas Novaculite | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...upper Paleozoic | |
| ....Arkansas Novaculite | |
| RT | Devonian |
| Mississippian | |
| Oklahoma | |
| Arkansas | |
| SN | Devonian and Mississippian. SW Arkansas and SE Oklahoma. Indexed with ages as applicable. Added to Thesaurus in 1985. |
| Arkansas River | |
|---|---|
| BT | United States |
| .Arkansas River | |
| RT | Oklahoma |
| Colorado | |
| Mississippi | |
| Kansas | |
| Arkansas | |
| SN | S 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 | |
|---|---|
| BT | United States |
| .Arkansas River valley | |
| RT | Oklahoma |
| Colorado | |
| Kansas | |
| Arkansas | |
| SN | Indexed with states as applicable. |
| Arkansas River#Arkansas River valley#Bald Mountain#Battle Mountain#Benton Format |
|---|
| Arkhangelsk Russian Federation | |
|---|---|
| BT | Commonwealth of Independent States |
| .Russian Federation | |
| ..Arkhangelsk Russian Federation | |
| BT | Europe |
| .Arkhangelsk Russian Federation | |
| NT | Belozero Russian Federation |
| Franz Josef Land | |
| Mezen Russian Federation | |
| Nenets Russian Federation | |
| Novaya Zemlya | |
| Onega Russian Federation | |
| Vetrenyy Ridge | |
| UF | Archangel Russian Federation |
| RT | Belaya Gora Russian Federation |
| Mezen River basin | |
| Northern Dvina River | |
| SN | City 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 | |
|---|---|
| BT | United States |
| .Arkoma Basin | |
| RT | Oklahoma |
| Arkansas | |
| Spiro Sandstone | |
| SN | Indexed with states as applicable. |
| arkose | |
|---|---|
| BT | sedimentary rocks |
| .clastic rocks | |
| ..arkose | |
| RT | sandstone |
| terrigenous materials | |
| arkosic composition | |
| meta-arkose | |
| subarkose | |
| arkosic composition | |
|---|---|
| RT | arkose |
| sedimentary rocks | |
| sediments | |
| composition | |
| SN | Before 1978, also search arkosic AND specific sediment type or sedimentary rock. |
| Arlan | |
|---|---|
| RT | Bashkortostan Russian Federation |
| SN | Oil bearing region in Bashkortostan in S Urals. Indexed with region as applicable. |
| Arlington County Virginia | |
|---|---|
| BT | United States |
| .Virginia | |
| ..Arlington County Virginia | |
| SN | N Virginia. Along Potomac River opposite Washington, D.C. Also search Alexandria Virginia if applicable. |
| armalcolite | |
|---|---|
| BT | oxides |
| .armalcolite | |
| RT | titanium oxides |
| pseudobrookite | |
| Armenia | |
|---|---|
| BT | Europe |
| .Armenia | |
| BT | Commonwealth of Independent States |
| .Armenia | |
| NT | Agarak |
| 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 | |
| RT | Aragats |
| Lesser Caucasus | |
| Caucasus | |
| Oktemberyan Series | |
| Shakhdag Range | |
| Spitak earthquake 1988 | |
| Transcaucasia | |
| Zangezur | |
| SN | Formerly the Armenian Soviet Socialist Republic. This term has multiple hierarchies. |
| Armenia earthquake 1988 | |
|---|---|
| USE | Spitak earthquake 1988 |
| Armidale Australia | |
|---|---|
| BT | Australasia |
| .Australia | |
| ..New South Wales Australia | |
| ...Armidale Australia | |
| SN | Town in NE New South Wales. |
| armored mud balls | |
|---|---|
| BT | sedimentary structures |
| .secondary structures | |
| ..armored mud balls | |
| UF | mud balls, armored |
| RT | clay |
| Armorica | |
|---|---|
| USE | Armorican Massif |
| Armorican Massif | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..France | |
| ...Armorican Massif | |
| UF | Armorica |
| RT | Cadomian Orogeny |
| SN | NW France. |
| Armstrong County Pennsylvania | |
|---|---|
| BT | United States |
| .Pennsylvania | |
| ..Armstrong County Pennsylvania | |
| SN | W Pennsylvania. |
| Armstrong County Texas | |
|---|---|
| BT | United States |
| .Texas | |
| ..Armstrong County Texas | |
| SN | Extreme N Texas. |
| Arno River basin | |
|---|---|
| BT | Europe |
| .Southern Europe | |
| ..Italy | |
| ...Tuscany Italy | |
| ....Arno River basin | |
| SN | N central Tuscany. |
| aromatic hydrocarbons | |
|---|---|
| BT | organic compounds |
| .hydrocarbons | |
| ..aromatic hydrocarbons | |
| NT | benzene |
| BTEX | |
| ethylbenzene | |
| hopanoids | |
| oleananes | |
| polycyclic aromatic hydrocarbons | |
| toluene | |
| xylene | |
| UF | arenes |
| RT | chlorobenzene |
| hexachlorobenzene | |
| aliphatic hydrocarbons | |
| biomarkers | |
| aromatization | |
| soil vapor extraction | |
| soil venting | |
| SN | Before 1978, search (aromatic or aromatics) AND hydrocarbons. |
| aromatization | |
|---|---|
| RT | aromatic hydrocarbons |
| hydrocarbons | |
| petroleum | |
| processes | |
| production | |
| SN | Added to Thesaurus in 1989. |
| Aroostook County Maine | |
|---|---|
| BT | United States |
| .Maine | |
| ..Aroostook County Maine | |
| NT | Presque Isle Maine |
| RT | Saint John River |
| SN | N Maine. |
| Arosa Bay | |
|---|---|
| BT | Europe |
| .Southern Europe | |
| ..Iberian Peninsula | |
| ...Spain | |
| ....Galicia Spain | |
| .....Arosa Bay | |
| RT | La Coruna Spain |
| Pontevedra Spain | |
| SN | On the Atlantic Ocean in W between provinces of La Coruna and Pontevedra. Indexed with provinces. |
| Arran | |
|---|---|
| RT | Firth of Clyde |
| Strathclyde region Scotland | |
| SN | Island in Firth of Clyde in SW Scotland. Before 1975, it was included in Buteshire. Indexed with Strathclyde region Scotland if applicable. |
| arrays | |
|---|---|
| RT | computer networks |
| electrical methods | |
| geophysical methods | |
| geophysical surveys | |
| LASA | |
| networks | |
| NORESS | |
| NORSAR | |
| PANDA | |
| PASSCAL | |
| portable arrays | |
| Schlumberger methods | |
| seismic networks | |
| SMART2 | |
| TERRAscope | |
| arrival time | |
|---|---|
| RT | dip moveout |
| earthquakes | |
| elastic waves | |
| moveout | |
| normal moveout | |
| ray tracing | |
| raypaths | |
| seismic migration | |
| seismology | |
| Arrow Canyon Range | |
|---|---|
| BT | United States |
| .Nevada | |
| ..Arrow Canyon Range | |
| Arroyo El Mimbral | |
|---|---|
| BT | Mexico |
| .Tamaulipas Mexico | |
| ..Arroyo El Mimbral | |
| UF | El Mimbral, Arroyo |
| Mimbral, Arroyo El | |
| RT | K-T boundary |
| SN | Stream 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 | |
|---|---|
| BT | fluvial features |
| .arroyos | |
| BT | erosion features |
| .arroyos | |
| RT | geomorphology |
| wadis | |
| ephemeral streams | |
| gullies | |
| SN | This term has multiple hierarchies. |
| arsenates | |
|---|---|
| NT | adamite |
| austinite | |
| beudantite | |
| conichalcite | |
| haidingerite | |
| legrandite | |
| mimetite | |
| pharmacolite | |
| pharmacosiderite | |
| scorodite | |
| RT | minerals |
| arsenic | |
|---|---|
| BT | metals |
| .arsenic | |
| UF | As |
| RT | native elements |
| arsenic ores | |
| arsenopyrite | |
| chalcophile elements | |
| SN | Chemical element. Use arsenic ores for arsenic as a commodity. |
| arsenic ores | |
|---|---|
| BT | metal ores |
| .arsenic ores | |
| RT | native elements |
| arsenic | |
| arsenopyrite | |
| SN | Commodity. See List C. |
| arsenical pyrites | |
|---|---|
| USE | arsenopyrite |
| arsenides | |
|---|---|
| NT | arsenopyrite |
| cobaltite | |
| gersdorffite | |
| lollingite | |
| maucherite | |
| niccolite | |
| pararammelsbergite | |
| rammelsbergite | |
| safflorite | |
| skutterudite | |
| sperrylite | |
| RT | minerals |
| arsenites | |
|---|---|
| NT | mixite |
| RT | minerals |
| arsenopyrite | |
|---|---|
| BT | sulfides |
| .arsenopyrite | |
| BT | arsenides |
| .arsenopyrite | |
| UF | arsenical pyrites |
| white pyrites | |
| RT | arsenic |
| arsenic ores | |
| lollingite | |
| SN | This term has multiple hierarchies. |
| arsenosulfides | |
|---|---|
| BT | sulfides |
| .arsenosulfides | |
| Arsia Mons | |
|---|---|
| BT | Mars |
| .Arsia Mons | |
| RT | volcanoes |
| Tharsis | |
| Tharsis Montes | |
| SN | Volcano on Mars. Added to Thesaurus in 1985. |
| art | |
|---|---|
| RT | archaeology |
| artifacts | |
| graphic methods | |
| petroglyphs | |
| SN | Also search specific types such as cave art or parietal art if applicable. Added to Thesaurus in 1995. |
| Artemisia | |
|---|---|
| BT | Plantae |
| .Spermatophyta | |
| ..Angiospermae | |
| ...Dicotyledoneae | |
| ....Artemisia | |
| RT | palynomorphs |
| miospores | |
| SN | Genus. |
| Artemovsk Ukraine | |
|---|---|
| BT | Europe |
| .Ukraine | |
| ..Artemovsk Ukraine | |
| UF | Bakhmut Ukraine |
| SN | City in the Donets Basin. This term has multiple hierarchies. |
| Arteni | |
|---|---|
| BT | Europe |
| .Armenia | |
| ..Arteni | |
| SN | Region in Armenia. This term has multiple hierarchies. |
| artesian waters | |
|---|---|
| RT | aquifers |
| aquitards | |
| confined aquifers | |
| ground water | |
| hydrogeology | |
| water | |
| water resources | |
| Arthabaska County Quebec | |
|---|---|
| BT | Canada |
| .Eastern Canada | |
| ..Quebec | |
| ...Arthabaska County Quebec | |
| Arthrodira | |
|---|---|
| BT | Chordata |
| .Vertebrata | |
| ..Pisces | |
| ...Placodermi | |
| ....Arthrodira | |
| SN | Order. |
| Arthropoda | |
|---|---|
| BT | Invertebrata |
| .Arthropoda | |
| NT | Chelicerata |
| Mandibulata | |
| Trilobitomorpha | |
| RT | cuticles |
| segmentation | |
| Tardigrada | |
| Arthur County Nebraska | |
|---|---|
| BT | United States |
| .Nebraska | |
| ..Arthur County Nebraska | |
| Arthur Harbor | |
|---|---|
| RT | Antarctica |
| Anvers Island | |
| SN | On Anvers Island. Off NW Antarctic Peninsula. Indexed with regions as applicable. |
| Articulata | |
|---|---|
| BT | Invertebrata |
| .Brachiopoda | |
| ..Articulata | |
| NT | Dictyonellidina |
| Orthida | |
| Pentamerida | |
| Rhynchonellida | |
| Spiriferida | |
| Strophomenida | |
| Terebratulida | |
| Thecideidina | |
| RT | Inarticulata |
| SN | Restricted to use with Brachiopoda. Articulata is not to be used as post-Paleozoic Crinoidea subclass or with other organisms. |
| Articulatae | |
|---|---|
| BT | Plantae |
| .Pteridophyta | |
| ..Sphenopsida | |
| ...Articulatae | |
| RT | Sphenopteris |
| artifacts | |
|---|---|
| UF | pottery |
| RT | archaeology |
| fossil man | |
| archaeological sites | |
| art | |
| Clovis | |
| petroglyphs | |
| SN | Before 1993, also search tools AND archaeology. |
| artificial | |
|---|---|
| SN | A valid term through 1977. After 1977, use artificial recharge, artificial islands, artificial intelligence, or synthetic materials if applicable. |
| artificial intelligence | |
|---|---|
| RT | data processing |
| expert systems | |
| neural networks | |
| self-organization | |
| SN | Added to Thesaurus in 1989. |
| artificial islands | |
|---|---|
| UF | man-made islands |
| RT | reclamation |
| sedimentation | |
| engineering geology | |
| barrier islands | |
| marine installations | |
| shorelines | |
| stabilization | |
| submarine installations | |
| SN | Often used in sedimentation, shore protection, and reclamation. Added to Thesaurus in 1993. |
| artificial minerals | |
|---|---|
| SN | Not a valid index term for GeoRef. Use synthetic materials and specific mineral name. |
| artificial recharge | |
|---|---|
| RT | fluid injection |
| ground water | |
| injection | |
| natural recharge | |
| recharge | |
| reinjection wells | |
| SN | Also search artificial AND recharge. |
| artificial wetlands | |
|---|---|
| USE | constructed wetlands |
| artinite | |
|---|---|
| BT | carbonates |
| .artinite | |
| Artinskian | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Permian | |
| ....Cisuralian | |
| .....Artinskian | |
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Permian | |
| ....Lower Permian | |
| .....Artinskian | |
| SN | Europe. Above Sakmarian, below Kungurian. |
| Artiodactyla | |
|---|---|
| BT | Chordata |
| .Vertebrata | |
| ..Tetrapoda | |
| ...Mammalia | |
| ....Theria | |
| .....Eutheria | |
| ......Artiodactyla | |
| NT | Hippopotamidae |
| Ruminantia | |
| Suiformes | |
| RT | Ungulata |
| SN | Order. |
| Artois | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..France | |
| ...Artois | |
| SN | Historic region in extreme N France, located to the S and SW of Flanders. |
| Arunachal Pradesh India | |
|---|---|
| BT | Asia |
| .Indian Peninsula | |
| ..India | |
| ...Northeastern India | |
| ....Arunachal Pradesh India | |
| RT | Himalayas |
| SN | State India, NE of Assam. |
| Arunta Block | |
|---|---|
| BT | Australasia |
| .Australia | |
| ..Northern Territory Australia | |
| ...Arunta Block | |
| RT | Arunta Complex |
| SN | Northern Territory, central Australia. Added to Thesaurus in 1989. |
| Arunta Complex | |
|---|---|
| BT | Chronostratigraphic Units |
| .Precambrian | |
| ..Archean | |
| ...Arunta Complex | |
| RT | Australia |
| Northern Territory Australia | |
| Arunta Block | |
| Arve Valley | |
|---|---|
| BT | Europe |
| .Arve Valley | |
| RT | Switzerland |
| France | |
| SN | River valley. Indexed with countries as applicable. |
| Arvicolidae | |
|---|---|
| BT | Chordata |
| .Vertebrata | |
| ..Tetrapoda | |
| ...Mammalia | |
| ....Theria | |
| .....Eutheria | |
| ......Rodentia | |
| .......Myomorpha | |
| ........Arvicolidae | |
| RT | Mimomys |
| SN | In some classifications, sometimes includes some genera from the family Cricetidae. |