Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
un  |
|---|
| Unalaska Island | |
|---|---|
| BT | United States |
| .Alaska | |
| ..Southwestern Alaska | |
| ...Aleutian Islands | |
| ....Unalaska Island | |
| NT | Makushin |
| SN | In Fox Islands, Aleutian Islands, SW Alaska. Added to Thesaurus in 1989. |
| uncertainty | |
|---|---|
| RT | errors |
| geostatistics | |
| probability | |
| reliability | |
| statistical analysis | |
| SN | Also index specific type of analysis if applicable. Added to Thesaurus in 1998. |
| UNCLOS | |
|---|---|
| USE | Law of the Sea |
| Uncompahgre Plateau | |
|---|---|
| USE | Uncompahgre Uplift |
| Uncompahgre Uplift | |
|---|---|
| BT | United States |
| .Uncompahgre Uplift | |
| UF | Uncompahgre Plateau |
| RT | New Mexico |
| Utah | |
| Colorado | |
| Paradox Basin | |
| SN | Indexed with states as applicable. Added to Thesaurus in 1989. |
| unconfined aquifers | |
|---|---|
| BT | aquifers |
| .unconfined aquifers | |
| RT | ground water |
| shallow depth | |
| water table | |
| shallow aquifers | |
| surficial aquifers | |
| unconformities | |
|---|---|
| NT | angular unconformities |
| erosional unconformities | |
| UF | unconformity |
| RT | stratigraphy |
| hardground | |
| exhumation | |
| sequence stratigraphy | |
| lithostratigraphy | |
| stratigraphic gaps | |
| unconformity | |
|---|---|
| USE | unconformities |
| unconformity-type deposits | |
|---|---|
| RT | mineral deposits, genesis |
| uranium ores | |
| unconsolidated materia |
|---|
| unconsolidated materials | |
|---|---|
| RT | coarse-grained materials |
| compactness | |
| consolidation | |
| fines | |
| materials | |
| particulate materials | |
| sediments | |
| soil mechanics | |
| soils | |
| SN | Before 1978, search unconsolidated. |
| UNCTAD | |
|---|---|
| UF | United Nations Conference on Trade and Development |
| RT | associations |
| economics | |
| international cooperation | |
| United Nations | |
| SN | Acronym. Usually out-of-scope for GeoRef. Added to Thesaurus in 1981. |
| und |
|---|
| Unda Russian Federation | |
|---|---|
| BT | Commonwealth of Independent States |
| .Russian Federation | |
| ..Chita Russian Federation | |
| ...Unda Russian Federation | |
| SN | Village in S Chita Oblast in Transbaikalia. Before 1993, Unda Russian Republic was also used. This term has multiple hierarchies. |
| undation | |
|---|---|
| RT | crust |
| crustal thickening | |
| tectonics | |
| underclay | |
|---|---|
| UF | coal clay |
| root clay | |
| seat clay | |
| seat earth | |
| underearth | |
| RT | clay |
| fireclay | |
| coal seams | |
| underearth | |
|---|---|
| USE | underclay |
| underground | |
|---|---|
| SN | A valid term through 1977. After 1977, use underground space. |
| underground cavities | |
|---|---|
| RT | caverns |
| caves | |
| solution cavities | |
| geomorphology | |
| underground space | |
| volcanic features | |
| SN | Use solution cavities if applicable. Also see underground space for engineering geology. Added to Thesaurus in 1993. |
| underground channels | |
|---|---|
| RT | channels |
| drainage | |
| infiltration galleries | |
| irrigation | |
| ground water | |
| underground installations | |
| waterways | |
| SN | Added to Thesaurus in 1981. |
| underground disposal | |
|---|---|
| UF | underground waste disposal |
| RT | waste disposal |
| radioactive waste | |
| waste disposal sites | |
| waste management | |
| underground installations | |
| landfills | |
| far-field | |
| near-field | |
| underground storage | |
| underground storage tanks | |
| SN | Added to Thesaurus in 1985. |
| underground installations | |
|---|---|
| UF | installations, underground |
| RT | mines |
| land subsidence | |
| seismic response | |
| rock mechanics | |
| permafrost | |
| geologic hazards | |
| seepage | |
| design | |
| construction | |
| feasibility studies | |
| foundations | |
| excavations | |
| pipelines | |
| leaking underground storage tanks | |
| far-field | |
| near-field | |
| gas storage | |
| oil storage | |
| site explora | |
| SN | Used for geological studies on underground cavities (natural or otherwise), excluding tunnels. |
| underground mines | |
|---|---|
| USE | underground mining |
| underground mining | |
|---|---|
| BT | mining |
| .underground mining | |
| UF | subsurface mining |
| underground mines | |
| RT | mines |
| mining geology | |
| cut-and-fill mining | |
| longwall mining | |
| underground installations | |
| roof control | |
| SN | Added to Thesaurus in 1982. |
| Underground Research Laboratory | |
|---|---|
| RT | Lac du Bonnet Batholith |
| Pinawa Manitoba | |
| waste disposal | |
| SN | Canada's URL is located at (N50#DG15'W095#DG50'), about 10 kilometers north of Pinawa Manitoba, Whiteshell Research Area, W end of Whiteshell Provincial Park. In the Lac du Bonnet Batholith, it is site of nuclear waste disposal investigations. May occur i |
| underground space | |
|---|---|
| UF | space, underground |
| RT | land use |
| underground cavities | |
| underground installations | |
| underground storage | |
| underground storage | |
|---|---|
| UF | subsurface storage |
| RT | waste disposal |
| underground installations | |
| storage | |
| leaking underground storage tanks | |
| far-field | |
| near-field | |
| underground disposal | |
| gas storage | |
| oil storage | |
| underground storage tanks | |
| high-level waste | |
| low-level waste | |
| Stripa region | |
| underground space | |
| SN | Added to Thesaurus in 1982. |
| underground storage tanks | |
|---|---|
| RT | gas storage |
| gasoline | |
| leaking underground storage tanks | |
| oil storage | |
| petroleum products | |
| storage | |
| underground disposal | |
| underground storage | |
| waste disposal | |
| SN | Use leaking underground storage tanks if applicable. Added to Thesaurus in 1995. |
| underground streams | |
|---|---|
| RT | caverns |
| caves | |
| exsurgence | |
| hydrogeology | |
| hydrology | |
| karst | |
| resurgence | |
| springs | |
| streams | |
| tributaries | |
| geomorphology | |
| ground water | |
| unsaturated zone | |
| SN | Added to Thesaurus in 1982. |
| underground waste disposal | |
|---|---|
| USE | underground disposal |
| underground water | |
|---|---|
| USE | ground water |
| Underhill Formation | |
|---|---|
| RT | Lower Cambrian |
| Neoproterozoic | |
| Vermont | |
| SN | Indexed with ages as applicable. Added to Thesaurus in 1989. |
| underplating | |
|---|---|
| UF | subcretion |
| RT | extension tectonics |
| plate tectonics | |
| rifting | |
| accretionary wedges | |
| active margins | |
| subduction zones | |
| lithosphere | |
| continental crust | |
| oceanic crust | |
| underthrust faults | |
| SN | Used to refer to different concepts in plate tectonics: In areas of rifting and thinning of continental crust, used to describe emplacement of basaltic magma at the base of the continental crust. In oceanic subduction zones, used to refer to accretion of |
| underpressure | |
|---|---|
| RT | fluid pressure |
| hydrostatic pressure | |
| pore pressure | |
| pressure | |
| reservoir properties | |
| underthrust faults | |
|---|---|
| BT | faults |
| .underthrust faults | |
| RT | underplating |
| SN | Before 1978, search underthrust AND faults. |
| UNDP | |
|---|---|
| UF | United Nations Development Programme |
| RT | associations |
| United Nations | |
| SN | Added to Thesaurus in 1981. |
| undulatory extinction | |
|---|---|
| RT | microscope methods |
| optical extinction | |
| SN | Added to Thesaurus in 1981. |
| Ungava | |
|---|---|
| BT | Canada |
| .Ungava | |
| UF | New Quebec |
| RT | Quebec |
| Labrador | |
| New Quebec Crater | |
| SN | Region including Quebec N of Eastmain River and SW Labrador. Indexed with Labrador and/or Quebec as applicable. |
| Ungava Crater | |
|---|---|
| USE | New Quebec Crater |
| Ungulata | |
|---|---|
| BT | Chordata |
| .Vertebrata | |
| ..Tetrapoda | |
| ...Mammalia | |
| ....Theria | |
| .....Eutheria | |
| ......Ungulata | |
| RT | Condylarthra |
| Amblypoda | |
| Artiodactyla | |
| Perissodactyla | |
| Dinocerata | |
| Litopterna | |
| Pantodonta | |
| Pyrotheria | |
| Xenungulata | |
| SN | Informal group name for the hoofed mammals. Includes Amblypoda, Artiodactyla, Condylarthra, Dinocerata, Litopterna, Pantodonta, Perissodactyla, Pyrotheria, and Xenungulata. |
| uniaxial tests | |
|---|---|
| RT | biaxial tests |
| testing | |
| triaxial tests | |
| engineering geology | |
| SN | Before 1978, search uniaxial. |
| Unicoi County Tennessee | |
|---|---|
| BT | United States |
| .Tennessee | |
| ..Unicoi County Tennessee | |
| UNIDO | |
|---|---|
| UF | United Nations Industrial Development Organization |
| RT | associations |
| United Nations | |
| SN | Added to Thesaurus in 1981. |
| uniformitarianism | |
|---|---|
| UF | actualism |
| RT | sedimentation |
| deposition | |
| biologic evolution | |
| stratigraphy | |
| geology | |
| catastrophism | |
| creationism | |
| history | |
| Union County Arkansas | |
|---|---|
| BT | United States |
| .Arkansas | |
| ..Union County Arkansas | |
| SN | S Arkansas. |
| Union County Florida | |
|---|---|
| BT | United States |
| .Florida | |
| ..Union County Florida | |
| SN | N Florida. |
| Union County Georgia | |
|---|---|
| BT | United States |
| .Georgia | |
| ..Union County Georgia | |
| SN | N Georgia. |
| Union County Illinois | |
|---|---|
| BT | United States |
| .Illinois | |
| ..Union County Illinois | |
| SN | S Illinois. |
| Union County Indiana | |
|---|---|
| BT | Indiana |
| .Union County Indiana | |
| SN | E Indiana. |
| Union County Iowa | |
|---|---|
| BT | United States |
| .Iowa | |
| ..Union County Iowa | |
| SN | S Iowa. |
| Union County Kentucky | |
|---|---|
| BT | United States |
| .Kentucky | |
| ..Union County Kentucky | |
| SN | W Kentucky. |
| Union County Mississippi | |
|---|---|
| BT | United States |
| .Mississippi | |
| ..Union County Mississippi | |
| SN | N Mississippi. |
| Union County New Jersey | |
|---|---|
| BT | United States |
| .New Jersey | |
| ..Union County New Jersey | |
| RT | Watchung Mountains |
| Union County New Mexico | |
|---|---|
| BT | United States |
| .New Mexico | |
| ..Union County New Mexico | |
| RT | Pasamonte Meteorite |
| SN | Extreme NE New Mexico. |
| Union County North Carolina | |
|---|---|
| BT | United States |
| .North Carolina | |
| ..Union County North Carolina | |
| SN | S North Carolina. |
| Union County Ohio | |
|---|---|
| BT | United States |
| .Ohio | |
| ..Union County Ohio | |
| SN | Central Ohio. |
| Union County Oregon | |
|---|---|
| BT | United States |
| .Oregon | |
| ..Union County Oregon | |
| RT | Wallowa Mountains |
| SN | NE Oregon. |
| Union County Pennsylvania | |
|---|---|
| BT | United States |
| .Pennsylvania | |
| ..Union County Pennsylvania | |
| SN | Central Pennsylvania. |
| Union County South Carolina | |
|---|---|
| BT | United States |
| .South Carolina | |
| ..Union County South Carolina | |
| SN | N South Carolina. |
| Union County South Dakota | |
|---|---|
| BT | United States |
| .South Dakota | |
| ..Union County South Dakota | |
| SN | SE South Dakota. |
| Union County Tennessee | |
|---|---|
| BT | United States |
| .Tennessee | |
| ..Union County Tennessee | |
| SN | NE Tennessee. |
| Union Islands | |
|---|---|
| USE | Tokelau |
| Union of Soviet Socialist Republics | |
|---|---|
| SN | Not a valid GeoRef index term after 1968. See USSR or Commonwealth of Independent States. |
| Union Parish Louisiana | |
|---|---|
| BT | United States |
| .Louisiana | |
| ..Union Parish Louisiana | |
| Unionidae | |
|---|---|
| BT | Invertebrata |
| .Mollusca | |
| ..Bivalvia | |
| ...Unionidae | |
| unit cell | |
|---|---|
| UF | cell, unit |
| RT | crystal structure |
| crystal systems | |
| lattice | |
| lattice parameters | |
| United Arab Emirates | |
|---|---|
| BT | Asia |
| .Arabian Peninsula | |
| ..United Arab Emirates | |
| NT | Abu Dhabi |
| Ajman | |
| Dubai | |
| Fujairah | |
| Ras al-Khaimah | |
| Sharjah | |
| Umm al-Qaiwain | |
| UF | Trucial Coast |
| Trucial Oman | |
| RT | Hanifa Formation |
| Khuff Formation | |
| Shuaiba Formation | |
| Arab Formation | |
| Middle East | |
| Near East | |
| Semail Ophiolite | |
| Thamama Group | |
| SN | Federation of 7 states which was achieved in 1972. Formerly known as Trucial States, Trucial Oman, or Trucial Coast. Not strictly equivalent to Trucial Coast, but replaces Trucial Coast. |
| United Kingdom | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..United Kingdom | |
| NT | Great Britain |
| Isle of Man | |
| Northern Ireland | |
| RT | Aberystwyth Grits |
| British Virgin Islands | |
| Ballantrae Complex | |
| Speeton Clay | |
| Barton Beds | |
| Barwell Meteorite | |
| Bembridge Marls | |
| British Geological Survey | |
| Skiddaw Slates | |
| London Clay | |
| Lower Greensand | |
| Sherwood Sandstone | |
| Oxford Clay | |
| Penrhyn Slate | |
| Shap Granite | |
| Upper Old | |
| SN | Comprising Great Britain and Northern Ireland. Indexed with political divisions as applicable. |
| United Nations | |
|---|---|
| RT | associations |
| International Monetary Fund | |
| UNCTAD | |
| UNDP | |
| UNIDO | |
| World Bank | |
| United Nations Conference on Trade and Development | |
|---|---|
| USE | UNCTAD |
| United Nations Convention on the Law of the Sea | |
|---|---|
| USE | Law of the Sea |
| United Nations Development Programme | |
|---|---|
| USE | UNDP |
| United Nations Industrial Development Organization | |
|---|---|
| USE | UNIDO |
| United States Exclusive Economic Z |
|---|
| United States Exclusive Economic Zone | |
|---|---|
| UF | U.S. Exclusive Economic Zone |
| RT | United States |
| ocean floors | |
| economics | |
| Gulf of Mexico | |
| North Pacific | |
| North Atlantic | |
| offshore | |
| mineral exploration | |
| exploration | |
| policy | |
| Law of the Sea | |
| Exclusive Economic Zone | |
| strategic minerals | |
| SN | Before 1985, also search EEZ or Exclusive Economic Zone AND United States. Added to Thesaurus in 1985. |
| United States Geological Survey | |
|---|---|
| USE | U. S. Geological Survey |
| units, stratigraphic | |
|---|---|
| USE | stratigraphic units |
| univariate analysis | |
|---|---|
| BT | statistical analysis |
| .univariate analysis | |
| RT | analysis |
| bivariate analysis | |
| multivariate analysis | |
| SN | Added to Thesaurus in 1989. |
| Universal Soil Loss Equation | |
|---|---|
| UF | USLE |
| RT | erosion |
| soils | |
| equations | |
| mathematical methods | |
| runoff | |
| soil erosion | |
| erodibility | |
| SN | Added to Thesaurus in 1989. |
| universal stage | |
|---|---|
| UF | Fedorov stage |
| stage, universal | |
| U-stage | |
| RT | structural analysis |
| microscope methods | |
| ore microscopy | |
| universities | |
|---|---|
| USE | academic institutions |
| University of Arizona | |
|---|---|
| RT | academic institutions |
| Arizona | |
| SN | In Tucson. |
| University of Bonn | |
|---|---|
| RT | academic institutions |
| Germany | |
| SN | In Bonn, North Rhine-Westphalia. |
| University of California | |
|---|---|
| RT | academic institutions |
| Los Alamos National Laboratory | |
| California | |
| SN | Has geoscience departments located in Berkeley, Davis, Los Angeles, Riverside, San Diego, Santa Barbara and Santa Cruz. |
| University of Cambridge | |
|---|---|
| USE | Cambridge University |
| University of Louvain | |
|---|---|
| RT | academic institutions |
| Belgium | |
| SN | In Louvain E of Brussels. |
| University of Lund | |
|---|---|
| RT | academic institutions |
| Sweden | |
| SN | In Lund, Malmohus, extreme S Sweden. |
| University of Michigan | |
|---|---|
| RT | academic institutions |
| Michigan | |
| SN | In Ann Arbor W of Detroit. |
| University of Pennsylvania | |
|---|---|
| RT | academic institutions |
| Pennsylvania | |
| SN | In Philadelphia. |
| University of Rome | |
|---|---|
| RT | academic institutions |
| Italy | |
| SN | In Rome. |
| University of Tokyo | |
|---|---|
| UF | Tokyo Imperial University |
| RT | academic institutions |
| Japan | |
| SN | In Tokyo. |
| University of Wisconsin | |
|---|---|
| RT | academic institutions |
| Wisconsin | |
| SN | Has geoscience departments located in Madison, Eau Claire, Green Bay, Wausau (Marathon County campus), Milwaukee, Oshkosh, Kenosha (Parkside campus), Platteville, River Falls, Stevens Point, Superior and Whitewater. |
| Unkar Group | |
|---|---|
| BT | Chronostratigraphic Units |
| .Precambrian | |
| ..Unkar Group | |
| RT | Arizona |
| SN | Grand Canyon Series. Divided into (descending) Dox Sandstone, Shinumo Quartzite, Hakatai Shale, Bass Limestone, and Hotuata Conglomerate. In N Arizona. |
| unmixing | |
|---|---|
| USE | exsolution |
| unsaturated zone | |
|---|---|
| UF | non-saturated zone |
| vadose zone | |
| zone of aeration | |
| RT | soils |
| ground water | |
| hydrogeology | |
| SUTRA | |
| preferential flow | |
| capillary water | |
| saturated zone | |
| water table | |
| underground streams | |
| water regimes | |
| Green-Ampt model | |
| DRAINMOD | |
| infiltration | |
| Richards equation | |
| SN | Subsurface zone with pressure less than atmospheric. In GeoRef, it is not considered ground water. Added to Thesaurus in 1981. |
| Unst | |
|---|---|
| BT | Europe |
| .Western Europe | |
| ..United Kingdom | |
| ...Great Britain | |
| ....Scotland | |
| .....Shetland Islands | |
| ......Unst | |
| SN | Northernmost large island of the Shetland Islands. This term has multiple hierarchies. |
| unsteady flow | |
|---|---|
| UF | transient flow |
| RT | hydrology |
| hydrodynamics | |
| hydraulics | |
| fluid dynamics | |
| radial flow | |
| steady flow | |
| SN | Added to Thesaurus in 1982. |
| Unstrut River | |
|---|---|
| BT | Europe |
| .Central Europe | |
| ..Germany | |
| ...Unstrut River | |
| RT | Saxony-Anhalt Germany |
| Thuringia Germany | |
| SN | Tributary of the Saale River. Also search Unstrut. Indexed with states as applicable. |
| Unzen | |
|---|---|
| BT | Asia |
| .Far East | |
| ..Japan | |
| ...Kyushu | |
| ....Nagasaki Japan | |
| .....Unzen | |
| UF | Unzen Volcano |
| RT | volcanoes |
| SN | Active volcano. In Unzen National Park, Nagasaki Prefecture on central Shimabar Peninsula E of Nagasaki. |
| Unzen Volcano | |
|---|---|
| USE | Unzen |