Th  search
USEthorium
Th-228  search
BTisotopes
 .radioactive isotopes
 ..Th-228
BTmetals
 .actinides
 ..thorium
 ...Th-228
SNThis term has multiple hierarchies.
Th-230  search
BTisotopes
 .radioactive isotopes
 ..Th-230
BTmetals
 .actinides
 ..thorium
 ...Th-230
UFionium
RTIo/Th
 Io/U
 Th-232/Th-230
 U-234/Th-230
 U-238/Th-230
SNUsed for ionium. This term has multiple hierarchies.
Th-230/Ra-226  search
BTisotopes
 .radioactive isotopes
 ..Th-230/Ra-226
BTmetals
 .actinides
 ..thorium
 ...Th-230/Ra-226
BTmetals
 .alkaline earth metals
 ..radium
 ...Th-230/Ra-226
UFRa-226/Th-230
SNThis term has multiple hierarchies.
Th-230/Th-232  search
USETh-232/Th-230
Th-230/U-234  search
USEU-234/Th-230
Th-230/U-238  search
USEU-238/Th-230
Th-232  search
BTisotopes
 .radioactive isotopes
 ..Th-232
BTmetals
 .actinides
 ..thorium
 ...Th-232
RTTh-232/Th-230
 U-238/Th-232
SNThis term has multiple hierarchies.
Th-232/Th-230  search
BTisotopes
 .radioactive isotopes
 ..Th-232/Th-230
BTmetals
 .actinides
 ..thorium
 ...Th-232/Th-230
UFTh-230/Th-232
RTisotope ratios
 Th-230
 Th-232
SNThis term has multiple hierarchies.
Th-232/U-238  search
USEU-238/Th-232
Th-234  search
BTisotopes
 .radioactive isotopes
 ..Th-234
BTmetals
 .actinides
 ..thorium
 ...Th-234
SNThis term has multiple hierarchies.
Th/Th  search
RTabsolute age
 isotope ratios
 Th/U
 thorium
SNIsotopic ratio used in age determination.
Th/U  search
UFthorium-uranium
 U/Th
 uranium-thorium
RTabsolute age
 isotope ratios
 HIMU
 thorium
 uranium
 U/Th/Pb
 Th/Th
SNIsotopic ratio used in age determination.
Thailand  search
BTAsia
 .Far East
 ..Thailand
NTBangkok Thailand
 Changwat Nakhon Phanom Thailand
 Chao Phraya River
 Chiang Mai Thailand
 Khorat Plateau
 Lampang Thailand
UFSiam
RTASEAN
 Indochina
 Phuket Group
 Malay Peninsula
 Khorat Group
Thalassinoides  search
BTichnofossils
 .Thalassinoides
thalenite  search
BTsilicates
 .orthosilicates
 ..sorosilicates
 ...thalenite
thallium  search
BTmetals
 .thallium
UFTl
thallophytes  search
RTalgae
 bacteria
 Bryophyta
 cyanobacteria
 fungi
 lichens
 Plantae
 prokaryotes
 Pteropsida
SNBefore 1998, algae, bacteria, fungi, lichens, and prokaryotes were narrower terms; Plantae was a broader term.
thalwegs  search
RTchannels
 fluvial currents
 ground water
 stream transport
 streams
SNAdded to Thesaurus in 1989.
Thamama Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Lower Cretaceous
 .....Thamama Group
RTUnited Arab Emirates
 Saudi Arabia
 Oman
 Qatar
SNArabian Peninsula. Added to Thesaurus in 1989.
Thames Estuary  search
RTEngland
 Essex England
 Isle of Sheppey
 Kent England
 London England
SNThe broad tidal mouth of the Thames River in SE England. Also search Thames AND England. May also occur in other locations. Indexed with counties and/or countries and/or region as applicable.
Thames River  search
UFThe Thames
RTEngland
 Ontario
 Connecticut
 New London County Connecticut
 Lake Saint Clair
 Essex England
 Kent England
 Isle of Sheppey
 London England
SNFlows from the E slope of the Cotswold Hills E to the North Sea in SE England. Also in SE Connecticut which flows into Long Island Sound. Also in SE Ontario which flows into Lake Saint Clair. Also search Thames in combination with state or country. Indexe
thanatocenoses  search
UFdeath assemblages
 taphocenoses
 taphocoenosis
 thanatocoenosis
RTpaleontology
 biocenoses
 taphonomy
thanatocoenosis  search
USEthanatocenoses
Thanetian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Paleogene
 ....Paleocene
 .....Thanetian
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Paleogene
 ....Paleocene
 .....upper Paleocene
 ......Thanetian
SNEurope. Above Montian, below Ypresian (Eocene).
Tharsis  search
BTMars
 .Tharsis
RTArsia Mons
 Tharsis Montes
 Ascraeus Mons
SNAs of 1978, term is restricted to morphologic features on Mars. Before 1978 term was also used for village in Spain.
Tharsis Montes  search
BTMars
 .Tharsis Montes
RTArsia Mons
 Tharsis
 Ascraeus Mons
SNIn Tharsis region includes Ascraeus Mons, Pavonis Mons, and Arsia Mons. Added to Thesaurus in 1993.
thaumasite  search
BTcarbonates
 .thaumasite
BTsilicates
 .orthosilicates
 ..nesosilicates
 ...thaumasite
BTsulfates
 .thaumasite
SNThis term has multiple hierarchies.
thawing  search
RTfreezing
 frost action
 glacial geology
 ice
 permafrost
 snow
 taliks
Thayer County Nebraska  search
BTUnited States
 .Nebraska
 ..Thayer County Nebraska
Thaynes Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Triassic
 ....Lower Triassic
 .....Thaynes Formation
RTIdaho
 Utah
 Wyoming
 Montana
SNConsists of limestone, calcareous sandstone, sandstone, shale, and in the middle, red shale member. In SE Idaho, SW Montana, NE Utah, and SW Wyoming.
The Banks  search
USEOuter Banks
The Coorong  search
USECoorong Lagoon
The Geysers  search
BTUnited States
 .California
 ..The Geysers
UFGeysers, The
RTgeothermal fields
 Sonoma County California
SNEight miles NE of Geyserville in Sonoma County, W California.
The Great Oasis  search
USEKharga Oasis
The Himalaya  search
USEHimalayas
The Rand  search
SNNot a valid term for GeoRef. See Witwatersrand for basin of South Africa or Rand Mountains of California as applicable.
The Spessart  search
USESpessart
The Thames  search
USEThames River
The Weald  search
BTEurope
 .Western Europe
 ..United Kingdom
 ...Great Britain
 ....England
 .....The Weald
UFWeald
 Weald region
RTKent England
 Sussex England
 Surrey England
SNWooded region in Kent, Surrey, and Sussex counties of SE England.
Thebes Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Paleogene
 ....Eocene
 .....lower Eocene
 ......Thebes Formation
RTEgypt
SNE Egypt. Overlies Esna Shale; underlies Minia Formation. Added to Thesaurus in 1989.
Thecamoeba  search
BTInvertebrata
 .Protista
 ..Thecamoeba
RTmicrofossils
SNIndexed with microfossils if applicable.
Thecideidae  search
BTInvertebrata
 .Brachiopoda
 ..Articulata
 ...Thecideidina
 ....Thecideidae
Thecideidina  search
BTInvertebrata
 .Brachiopoda
 ..Articulata
 ...Thecideidina
NTThecideidae
Thecodontia  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Reptilia
 ....Diapsida
 .....Archosauria
 ......Thecodontia
SNOrder.
Theiss River  search
USETisza River
Thellier Method  search
RTmagnetic field
 methods
 paleomagnetism
 remanent magnetization
 thermoremanent magnetization
SNAdded to Thesaurus in 1989.
thematic mapper  search
RTairborne methods
 digital cartography
 geophysical surveys
 instruments
 Landsat
 mosaics
 multispectral analysis
 multispectral scanner
 remote sensing
 satellite methods
 geophysical methods
SNAdded to Thesaurus in 1985.
thenardite  search
BTsulfates
 .thenardite
theoretical models  search
UFconceptual models
RTmodels
SNUsed for discussion of a model which is not a mathematical model or a physical model, but which exists in the form of a drawing, diagram, chart or description. Added to Thesaurus in 1985.
theoretical seismograms  search
BTseismograms
 .theoretical seismograms
SNAdded to Thesaurus in 1981.
theoretical studies  search
UFstudies, theoretical
RTexperimental studies
 laboratory studies
theory  search
SNA valid term through mid-1978. Use theoretical studies.
Thera  search
BTMediterranean region
 .Aegean Islands
 ..Greek Aegean Islands
 ...Cyclades
 ....Thera
UFSantorini
 Thira
RTSantorin
SNVolcanic island. The southernmost of the Cyclades in the Aegean Sea. Also search Santorin. This term has multiple hierarchies.
Therapsida  search
BTSynapsida
 .Therapsida
NTCynodontia
 Dicynodontia
SNOrder.
Theria  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Mammalia
 ....Theria
NTEutheria
 Metatheria
 Pantotheria
 Symmetrodonta
SNSubclass.
thermal  search
SNA valid term through 1977.
thermal alteration  search
RTalteration
 color alteration index
 hydrothermal alteration
 magmatism
 thermal effects
SNBefore 1978, also search thermal AND alteration.
thermal alteration index  search
USEcolor alteration index
thermal anal  search
thermal analysis  search
RTanalysis
 chemical analysis
 clay mineralogy
 differential thermal analysis
 DTA data
 electron microscopy
 endothermic reactions
 interlaboratory comparison
 sample preparation
 spectroscopy
 standard materials
 TGA data
 thermal analysis data
 thermogravimetric anal
SNUsed for methodology and not for data. For data, use thermal analysis data. Indexed with also the specific type of analysis if possible [e.g. differential thermal analysis, thermogravimetric analysis, thermomagnetic analysis].
thermal analysis data  search
UFthermal data
RTBrillouin spectra
 thermal analysis
SNUsed for data and not for methodology. Added to Thesaurus in 1985.
thermal anomalies  search
UFtemperature anomaly
RTanomalies
 geothermal fields
 heat flow
 hot springs
 hot spots
SNUsed as a general term. Use more specific terms (e.g. hot spots) if applicable. Added to Thesaurus in 1989.
thermal aureole  search
USEaureoles
thermal circulation  search
RTcirculation
 ocean circulation
SNBefore 1978, also search oceans AND circulation AND thermal.
thermal conductivity  search
RTconductivity
 electrical conductivity
 geothermal gradient
 heat flow
 measurement
 specific heat
 thermal diffusivity
 thermal inertia
SNBefore 1976, also search conductivity.
thermal data  search
USEthermal analysis data
thermal demagnetization  search
BTdemagnetization
 .thermal demagnetization
RTgeophysics
 magnetization
 paleomagnetism
 remanent magnetization
SNAdded to Thesaurus in 1981.
thermal diffusivity  search
UFdiffusivity, thermal
RTheat flow
 thermal conductivity
 diffusivity
thermal discharge  search
USEthermal pollution
thermal effects  search
RTeffects
 thermal alteration
SNAdded to Thesaurus in 1981.
thermal emission  search
UFemission, thermal
RTremote sensing
 infrared methods
 emissivity
thermal emissivity  search
USEemissivity
thermal energy storage  search
USEheat storage
thermal evolution  search
SNAs of 1993, use thermal maturity for petroleum or thermal alteration or thermal history.
thermal expansion  search
UFexpansion, thermal
RTproperties
 stress
 strain
 expansive materials
 thermodynamic properties
 expansion
 thermal properties
 thermomechanical properties
SNAdded to Thesaurus in 1995.
thermal gradient  search
SNNot a valid term for GeoRef. See geothermal gradient if applicable.
thermal history  search
RTgeosynclines
 P-T-t paths
 paleotemperature
 temperature
 thermal maturity
 thermal regime
 thermochronology
SNBefore 1993, also search thermal evolution.
thermal inertia  search
RTheat flow
 specific heat
 thermal conductivity
 thermal properties
 thermodynamic properties
SNAdded to Thesaurus in 1985.
Thermal Infrared Multispectral Scanner  search
RTinfrared methods
 multispectral scanner
 remote sensing
 thermal ionization mass spectroscopy
SNBefore 1988, also search TIMS and remote sensing. For multispectral scanner data use Thermal Infrared Multispectral Scanner data. Indexed with infrared methods if applicable.
thermal ionization mass spectroscopy  search
BTspectroscopy
 .mass spectroscopy
 ..thermal ionization mass spectroscopy
RTabsolute age
 heat flow
 Thermal Infrared Multispectral Scanner
 uranium disequilibrium
SNBefore 1998, also search TIMS and (spectroscopy or absolute age). For the method. For data, use thermal ionization mass spectra. Added to Thesaurus in 1998.
thermal maturation  search
USEthermal maturity
thermal maturity  search
UFthermal maturation
RTmaturity
 biomarkers
 petroleum
 color alteration index
 thermal history
SNBefore 1993, also search thermal evolution and petroleum. Added to Thesaurus in 1985.
thermal metamorphism  search
BTmetamorphism
 .thermal metamorphism
UFthermometamorphism
SNNot a valid index term through 1977. Before 1978, also search metamorphism AND thermal.
thermal methods  search
SNNot a valid GeoRef index term after 1971. Used in subfiles G and N. See heat flow or thermal analysis.
thermal pollution  search
UFthermal discharge
RTpollution
 waste disposal
SNBefore 1978, also search pollution AND thermal.
thermal properties  search
RTheat capacity
 permafrost
 physical properties
 properties
 specific heat
 temperature
 thermal expansion
 thermal inertia
 engineering geology
 thermochemical properties
 thermodynamic properties
 thermoelastic properties
 thermomechanical properties
thermal recovery  search
UFheat treatment
RTtertiary recovery
 enhanced recovery
 recovery
SNAdded to Thesaurus in 1985.
thermal regime  search
RTgeothermal systems
 heat flow
 hydrogeology
 thermal history
 engineering geology
SNAdded to Thesaurus in 1981.
thermal remanent magnetization  search
USEthermoremanent magnetization
thermal springs  search
USEhot springs
thermal surveys  search
USEheat flow
thermal waters  search
RTbrines
 fractures
 fumaroles
 geothermal energy
 geothermal fields
 geothermal gradient
 geothermal systems
 geysers
 ground water
 heat flow
 heat sources
 hot springs
 hydrochemistry
 hydrogeology
 hydrothermal alteration
 medicinal waters
 migration of elements
 minera
thermochemical properties  search
RTcalorimetry
 chemical properties
 properties
 thermal properties
 geochemistry
thermochemical remanent magnetization  search
BTmagnetization
 .remanent magnetization
 ..thermochemical remanent magnetization
RTpaleomagnetism
SNAdded to Thesaurus in 1981.
thermochronology  search
RTabsolute age
 annealing
 Ar/Ar
 cooling
 crystallization
 diffusion
 exposure age
 fission tracks
 fission-track dating
 geochronology
 geologic thermometry
 He/He
 meteorites
 P-T conditions
 P-T-t paths
 Rb/Sr
 relative age
 Sm/Nd
 stratigraphy
 thermal history
 tectonics
SNDetermination of temperature-time-depth histories in metamorphic rocks. Techniques may include a combination of several of the isotopic techniques of absolute age to measure differential diffusion rates in minerals, or fission-track techniques. Before 199
thermocline  search
RTgeothermal gradient
 lakes
 ocean circulation
 temperature
SNAdded to Thesaurus in 1989.
thermodynamic properties  search
RTenthalpy
 entropy
 free energy
 fugacity
 isotherms
 Kirchhoff integral
 properties
 specific heat
 thermal expansion
 thermal inertia
 thermal properties
 geochemistry
 thermomechanical properties
thermoelastic properties  search
RTelastic properties
 mechanical properties
 physical properties
 properties
 thermal properties
SNAdded to Thesaurus in 1989.
thermography  search
USEdifferential thermal analysis
thermogravimetric anal  search
thermogravimetric analysis  search
UFthermogravimetry
RTchemical analysis
 analysis
 differential thermal analysis
 thermal analysis
 TGA data
thermogravimetry  search
USEthermogravimetric analysis
thermohaline circula  search
thermohaline circulation  search
RTcirculation
 ocean circulation
SNBefore 1978, also search oceans AND circulation AND thermohaline.
thermokarst  search
UFcryokarst
RTglacial geology
 permafrost
 geomorphology
 karst
 frost action
 periglacial features
 ground ice
 suffosion
 pseudokarst
thermoluminescence  search
RTfluorescence
 geochronology
 irradiation
 luminescence
 relative age
thermomagnetic analysis  search
RTanalysis
 thermal analysis
thermomechanical properties  search
UFthermophysical properties
RTphysical properties
 mechanical properties
 thermodynamic properties
 thermal expansion
 thermal properties
SNAdded to Thesaurus in 1985.
thermometamorphism  search
USEthermal metamorphism
thermometry  search
SNA valid term through mid-1978. Use geologic thermometry.
thermonatrite  search
BTcarbonates
 .thermonatrite
thermophilic taxa  search
RTbacteria
 faunal studies
 floral studies
 hydrothermal conditions
 hydrothermal vents
 living taxa
 ocean floors
SNIndexed with specific type. Added to Thesaurus in 1998.
thermophysical properties  search
USEthermomechanical properties
thermoremanence  search
USEthermoremanent magnetization
thermoremanent magnetization  search
BTmagnetization
 .remanent magnetization
 ..thermoremanent magnetization
UFthermal remanent magnetization
 thermoremanence
 TRM
RTpaleomagnetism
 magnetic field
 Curie point
 partial thermoremanent magnetization
 Thellier Method
Theropoda  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Reptilia
 ....Diapsida
 .....Archosauria
 ......Saurischia
 .......Theropoda
NTCarnosauria
RTSmilodon
SNSuborder. This term has multiple hierarchies.
theses  search
UFdissertations
RTeducation
 publications
 monographs
SNAdded to Thesaurus in 1982.
Thessaloniki Greece  search
USESalonika Greece
Thessaly Greece  search
BTEurope
 .Southern Europe
 ..Greece
 ...Thessaly Greece
RTPindus Mountains
 Olympus
 Othrys
SNAdministrative region in E central Greece.
Thetford Mines  search
BTCanada
 .Eastern Canada
 ..Quebec
 ...Thetford Mines
RTmines
 asbestos deposits
SNCity and site of asbestos mines about 50 miles S of Quebec City in S Quebec. Also search Thetford AND Quebec.
Thetis Regio  search
BTVenus
 .Aphrodite Terra
 ..Thetis Regio
SNHighland massif, W Aphrodite Terra.
thick-skinned tectonics  search
BTtectonics
 .thick-skinned tectonics
RTbasement tectonics
 thrust faults
 neotectonics
 crustal thickening
 thin-skinned tectonics
SNAdded to Thesaurus in 1998.
thickness  search
RTcrust
 crustal thickening
 crustal thinning
 ice sheets
 isochores
thin sections  search
RTcross sections
 electron microscopy
 microfacies
 microscope methods
 petrography
 polished sections
 samples
thin-skin tectonics  search
USEthin-skinned tectonics
thin-skinned tectonics  search
BTtectonics
 .thin-skinned tectonics
UFthin-skin tectonics
RTcrust
 tectonophysics
 thick-skinned tectonics
 crustal thinning
SNAdded to Thesaurus in 1989.
Thiobacillus ferrooxidans  search
BTbacteria
 .Thiobacillus ferrooxidans
RTmicrofossils
 biodegradation
 oxidation
SNSpecies. For paleontologic studies, index microfossils.
Thira  search
USEThera
Third World  search
USEdeveloping countries
thixotropy  search
RTclay
 colloidal materials
 gels
 mechanical properties
 properties
 soil mechanics
 strength
 engineering geology
SNAdded to Thesaurus in 1982.
tholeiite  search
BTigneous rocks
 .volcanic rocks
 ..basalts
 ...tholeiite
RTocean-island basalts
 tholeiitic composition
 olivine tholeiite
tholeiitic basalt  search
BTigneous rocks
 .volcanic rocks
 ..basalts
 ...tholeiitic basalt
tholeiitic composition  search
RTbasalts
 composition
 igneous rocks
 tholeiite
SNBefore 1978, search tholeiitic.
tholeiitic dolerite  search
BTigneous rocks
 .plutonic rocks
 ..diabase
 ...tholeiitic dolerite
Thomar Portugal  search
USETomar Portugal
Thomas County Georgia  search
BTUnited States
 .Georgia
 ..Thomas County Georgia
Thomas County Kansas  search
BTUnited States
 .Kansas
 ..Thomas County Kansas
Thomas County Nebraska  search
BTUnited States
 .Nebraska
 ..Thomas County Nebraska
Thomas Range  search
BTUnited States
 .Utah
 ..Thomas Range
RTTooele County Utah
 Juab County Utah
 Spor Mountain
SNW Utah. Indexed with counties as applicable. Added to Thesaurus in 1981.
Thompson nickel belt  search
BTCanada
 .Western Canada
 ..Manitoba
 ...Thompson nickel belt
RTmetallogenic provinces
SNMetallogenic province, N Manitoba. Added to Thesaurus in 1985.
thomsenolite  search
BThalides
 .fluorides
 ..thomsenolite
Thomson Formation  search
BTChronostratigraphic Units
 .Precambrian
 ..Proterozoic
 ...Paleoproterozoic
 ....Thomson Formation
UFThomson Slate
RTWisconsin
 Minnesota
 Animikie Group
 Virginia Formation
SNNE Minnesota and NW Wisconsin. Includes the slate which has been referred to in literature as Thomson, Saint Louis, Cloquet, and Carlton slates. And which has usually been considered an equivalent of the Animikie-Virginia Slate of the Mesabi Range. In NE
Thomson Slate  search
USEThomson Formation
Thomson-Haskell analysis  search
RTanalysis
 seismology
SNAdded to Thesaurus in 1981.
thomsonite  search
BTsilicates
 .framework silicates
 ..zeolite group
 ...thomsonite
thorianite  search
BToxides
 .thorianite
thorite  search
BTsilicates
 .orthosilicates
 ..nesosilicates
 ...thorite
thorium  search
BTmetals
 .actinides
 ..thorium
NTTh-228
 Th-230
 Th-230/Ra-226
 Th-232
 Th-232/Th-230
 Th-234
 U-234/Th-230
 U-238/Th-230
 U-238/Th-232
UFTh
RTIo/Th
 Io/U
 isotopes
 Pb/Th
 HIMU
 Th/U
 U/Th/Pb
 thorium ores
 Th/Th
SNChemical element. Use thorium ores for thorium as a commodity.
thorium ores  search
BTmetal ores
 .thorium ores
RTmonazite deposits
 thorium
thorium-lead  search
USEPb/Th
thorium-uranium  search
USETh/U
Thorn Poland  search
USETorun Poland
thoron  search
USERn-222
thortveitite  search
BTsilicates
 .orthosilicates
 ..sorosilicates
 ...thortveitite
Thrace  search
BTEurope
 .Thrace
NTGreek Thrace
RTTurkey
 Greece
SNAdministrative region in extreme NE Greece (Western Thrace), and all of Turkey in Europe (Eastern Thrace). Indexed with countries as applicable.
Three Forks Montana  search
BTUnited States
 .Montana
 ..Gallatin County Montana
 ...Three Forks Montana
SNTown in SW Montana.
Three Gorges, Yangtze  search
USEYangtze Three Gorges
Three Rivers  search
SNNot a valid term for GeoRef. See Sanjiang for region in China.
three-component seismographs  search
BTseismographs
 .three-component seismographs
RTPANDA
SNAdded to Thesaurus in 1981.
three-dimensional methods  search
RTboreholes
 geophysical surveys
 prestack migration
 seismic methods
 techniques
 geophysical methods
SNAlso search three-dimensional with methods or techniques. Search with area for surveys. For surveys, also index geophysical surveys and the area. Added to Thesaurus in 1993.
three-dimensional models  search
RTasperities
 computer animation
 four-dimensional models
 mathematical models
 models
 MODFLOW
 MODPATH
 one-dimensional models
 seismology
 two-dimensional models
 visualization
SNBefore 1978, search three-dimensional AND models.
Throckmorton County Texas  search
BTUnited States
 .Texas
 ..Throckmorton County Texas
thrombolites  search
BTsedimentary structures
 .biogenic structures
 ..thrombolites
RTalgal structures
 stromatolites
SNAdded to Thesaurus in 1993.
thrust  search
SNA valid term through 1977. After 1977, see thrust faults. After 1988, also see thrust sheets.
thrust faults  search
BTfaults
 .thrust faults
UFreverse slip faults
 thrust slip faults
 thrusts and thrusting
RToverthrust faults
 fold and thrust belts
 thick-skinned tectonics
 duplexes
 ramps
 compression tectonics
 crustal shortening
 triangle zones
 reverse faults
 imbricate tectonics
 thrust sheets
 foreland basins
 step faults
SNBefore 1978, also search faults AND thrust. See overthrust faults; compression tectonics.
thrust plates  search
USEthrust sheets
thrust sheets  search
UFthrust plates
RTtectonics
 faults
 fold and thrust belts
 thrust faults
 neotectonics
 piggyback basins
SNAdded to Thesaurus in 1989.
thrust slip faults  search
USEthrust faults
thrusts and thrusting  search
USEthrust faults
Thule Greenland  search
BTArctic region
 .Greenland
 ..Thule Greenland
SNSettlement on coast of Hayes Peninsula N of Cape York in NW Greenland. U.S. Air Force base nearby.
thulium  search
BTmetals
 .rare earths
 ..thulium
UFTm
Thunder Bay  search
BTCanada
 .Eastern Canada
 ..Ontario
 ...Thunder Bay
RTLake Superior
 Thunder Bay District Ontario
SNRefers only to the inlet of NW Lake Superior. For the city on the bay, see Thunder Bay Ontario.
Thunder Bay District Ontario  search
BTCanada
 .Eastern Canada
 ..Ontario
 ...Thunder Bay District Ontario
NTManitouwadge Ontario
 Marshall Lake
 Northern Light Lake
 Thunder Bay Ontario
UFDistrict of Thunder Bay
RTMichipicoten Island
 Thunder Bay
SNN Ontario.
Thunder Bay Ontario  search
BTCanada
 .Eastern Canada
 ..Ontario
 ...Thunder Bay District Ontario
 ....Thunder Bay Ontario
SNRefers only to the city on the bay. For the inlet of NW Lake Superior, see Thunder Bay.
thunder eggs  search
USEgeodes
thunderstorms  search
SNAs of 1993, no longer a valid term for GeoRef. Usually out-of-scope. Used with meteorology. After 1993, see storms.
Thur Valley  search
BTEurope
 .Central Europe
 ..Switzerland
 ...Thur Valley
SNRiver valley SSW of Lake Constance extending to the Rhine River. Also search Thur River.
Thuringer Wald  search
USEThuringian Forest
Thuringia Basin  search
USEThuringian Basin
Thuringia Germany  search
BTEurope
 .Central Europe
 ..Germany
 ...Thuringia Germany
NTErfurt Germany
 Gera Germany
 Ruhla Germany
 Schlotheim Germany
 Schneeberg Germany
 Schwarzburg Anticlinorium
 Steinach Germany
 Taubach Germany
 Weimar Germany
RTRhon Mountains
 Saale River
 Weisse Elster Basin
 Thuringian Forest
 Geisel Valley
 Werra River
 Kyffhauser Range
 Saxony-Thuringia
 Vogtland
 Unstrut River
 Thuringian Basin
 Thuringian Hills
 Thuringian Massif
SNState in central Germany. Includes the Thuringian Forest. Before 1993, also search Erfurt Bezirk or Gera Bezirk if applicable.
Thuringian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Permian
 ....Thuringian
RTSaxothuringian
SNAdded to Thesaurus in 1981.
Thuringian Basin  search
BTEurope
 .Central Europe
 ..Germany
 ...Thuringian Basin
UFThuringia Basin
RTThuringia Germany
SNThuringian Forest region in Thuringia. Indexed with states as applicable.
Thuringian Forest  search
BTEurope
 .Central Europe
 ..Germany
 ...Thuringian Forest
UFThuringer Wald
RTThuringia Germany
 Franconian Forest
 Ruhla Germany
 Steinach Germany
SNForested mountain range extending NW-SE in Thuringia.
Thuringian Hills  search
BTEurope
 .Central Europe
 ..Germany
 ...Thuringian Hills
RTThuringia Germany
SNRegion in Germany. Indexed with states as applicable. Added to Thesaurus in 1981.
Thuringian Massif  search
BTEurope
 .Central Europe
 ..Germany
 ...Thuringian Massif
RTThuringia Germany
SNRegion in Germany. Indexed with states as applicable. Added to Thesaurus in 1981.
Thurston County Nebraska  search
BTUnited States
 .Nebraska
 ..Thurston County Nebraska
SNNE Nebraska.
Thurston County Washington  search
BTUnited States
 .Washington
 ..Thurston County Washington
NTTono Washington
SNW Washington.
Thysanoptera  search
BTInvertebrata
 .Arthropoda
 ..Mandibulata
 ...Insecta
 ....Pterygota
 .....Neoptera
 ......Exopterygota
 .......Thysanoptera
UFThysanopteroida
SNOrder.
Thysanopteroida  search
USEThysanoptera