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Th
USE	thorium

Th-228
BT	isotopes
	.radioactive isotopes
	..Th-228
BT	metals
	.actinides
	..thorium
	...Th-228
SN	This term has multiple hierarchies.

Th-230
BT	isotopes
	.radioactive isotopes
	..Th-230
BT	metals
	.actinides
	..thorium
	...Th-230
UF	ionium
RT	Io/Th
	Io/U
	Th-232/Th-230
	U-234/Th-230
	U-238/Th-230
SN	Used for ionium. This term has multiple hierarchies.

Th-230/Ra-226
BT	isotopes
	.radioactive isotopes
	..Th-230/Ra-226
BT	metals
	.actinides
	..thorium
	...Th-230/Ra-226
BT	metals
	.alkaline earth metals
	..radium
	...Th-230/Ra-226
UF	Ra-226/Th-230
SN	This term has multiple hierarchies.

Th-230/Th-232
USE	Th-232/Th-230

Th-230/U-234
USE	U-234/Th-230

Th-230/U-238
USE	U-238/Th-230

Th-232
BT	isotopes
	.radioactive isotopes
	..Th-232
BT	metals
	.actinides
	..thorium
	...Th-232
RT	Th-232/Th-230
	U-238/Th-232
SN	This term has multiple hierarchies.

Th-232/Th-230
BT	isotopes
	.radioactive isotopes
	..Th-232/Th-230
BT	metals
	.actinides
	..thorium
	...Th-232/Th-230
UF	Th-230/Th-232
RT	isotope ratios
	Th-230
	Th-232
SN	This term has multiple hierarchies.

Th-232/U-238
USE	U-238/Th-232

Th-234
BT	isotopes
	.radioactive isotopes
	..Th-234
BT	metals
	.actinides
	..thorium
	...Th-234
SN	This term has multiple hierarchies.

Th/Th
RT	absolute age
	isotope ratios
	Th/U
	thorium
SN	Isotopic ratio used in age determination.

Th/U
UF	thorium-uranium
	U/Th
	uranium-thorium
RT	absolute age
	isotope ratios
	HIMU
	thorium
	uranium
	U/Th/Pb
	Th/Th
SN	Isotopic ratio used in age determination.

Thailand
BT	Asia
	.Far East
	..Thailand
NT	Bangkok Thailand
	Changwat Nakhon Phanom Thailand
	Chao Phraya River
	Chiang Mai Thailand
	Khorat Plateau
	Lampang Thailand
UF	Siam
RT	ASEAN
	Indochina
	Phuket Group
	Malay Peninsula
	Khorat Group

Thalassinoides
BT	ichnofossils
	.Thalassinoides

thalenite
BT	silicates
	.orthosilicates
	..sorosilicates
	...thalenite

thallium
BT	metals
	.thallium
UF	Tl

thallophytes
RT	algae
	bacteria
	Bryophyta
	cyanobacteria
	fungi
	lichens
	Plantae
	prokaryotes
	Pteropsida
SN	Before 1998, algae, bacteria, fungi, lichens, and prokaryotes were narrower terms; Plantae was a broader term.

thalwegs
RT	channels
	fluvial currents
	ground water
	stream transport
	streams
SN	Added to Thesaurus in 1989.

Thamama Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Lower Cretaceous
	.....Thamama Group
RT	United Arab Emirates
	Saudi Arabia
	Oman
	Qatar
SN	Arabian Peninsula. Added to Thesaurus in 1989.

Thames Estuary
RT	England
	Essex England
	Isle of Sheppey
	Kent England
	London England
SN	The 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
UF	The Thames
RT	England
	Ontario
	Connecticut
	New London County Connecticut
	Lake Saint Clair
	Essex England
	Kent England
	Isle of Sheppey
	London England
SN	Flows 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
UF	death assemblages
	taphocenoses
	taphocoenosis
	thanatocoenosis
RT	paleontology
	biocenoses
	taphonomy

thanatocoenosis
USE	thanatocenoses

Thanetian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Paleocene
	.....Thanetian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Paleocene
	.....upper Paleocene
	......Thanetian
SN	Europe. Above Montian, below Ypresian (Eocene).

Tharsis
BT	Mars
	.Tharsis
RT	Arsia Mons
	Tharsis Montes
	Ascraeus Mons
SN	As of 1978, term is restricted to morphologic features on Mars. Before 1978 term was also used for village in Spain.

Tharsis Montes
BT	Mars
	.Tharsis Montes
RT	Arsia Mons
	Tharsis
	Ascraeus Mons
SN	In Tharsis region includes Ascraeus Mons, Pavonis Mons, and Arsia Mons. Added to Thesaurus in 1993.

thaumasite
BT	carbonates
	.thaumasite
BT	silicates
	.orthosilicates
	..nesosilicates
	...thaumasite
BT	sulfates
	.thaumasite
SN	This term has multiple hierarchies.

thawing
RT	freezing
	frost action
	glacial geology
	ice
	permafrost
	snow
	taliks

Thayer County Nebraska
BT	United States
	.Nebraska
	..Thayer County Nebraska

Thaynes Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Triassic
	....Lower Triassic
	.....Thaynes Formation
RT	Idaho
	Utah
	Wyoming
	Montana
SN	Consists 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
USE	Outer Banks

The Coorong
USE	Coorong Lagoon

The Geysers
BT	United States
	.California
	..The Geysers
UF	Geysers, The
RT	geothermal fields
	Sonoma County California
SN	Eight miles NE of Geyserville in Sonoma County, W California.

The Great Oasis
USE	Kharga Oasis

The Himalaya
USE	Himalayas

The Rand
SN	Not a valid term for GeoRef. See Witwatersrand for basin of South Africa or Rand Mountains of California as applicable.

The Spessart
USE	Spessart

The Thames
USE	Thames River

The Weald
BT	Europe
	.Western Europe
	..United Kingdom
	...Great Britain
	....England
	.....The Weald
UF	Weald
	Weald region
RT	Kent England
	Sussex England
	Surrey England
SN	Wooded region in Kent, Surrey, and Sussex counties of SE England.

Thebes Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....lower Eocene
	......Thebes Formation
RT	Egypt
SN	E Egypt. Overlies Esna Shale; underlies Minia Formation. Added to Thesaurus in 1989.

Thecamoeba
BT	Invertebrata
	.Protista
	..Thecamoeba
RT	microfossils
SN	Indexed with microfossils if applicable.

Thecideidae
BT	Invertebrata
	.Brachiopoda
	..Articulata
	...Thecideidina
	....Thecideidae

Thecideidina
BT	Invertebrata
	.Brachiopoda
	..Articulata
	...Thecideidina
NT	Thecideidae

Thecodontia
BT	Chordata
	.Vertebrata
	..Tetrapoda
	...Reptilia
	....Diapsida
	.....Archosauria
	......Thecodontia
SN	Order.

Theiss River
USE	Tisza River

Thellier Method
RT	magnetic field
	methods
	paleomagnetism
	remanent magnetization
	thermoremanent magnetization
SN	Added to Thesaurus in 1989.

thematic mapper
RT	airborne methods
	digital cartography
	geophysical surveys
	instruments
	Landsat
	mosaics
	multispectral analysis
	multispectral scanner
	remote sensing
	satellite methods
	geophysical methods
SN	Added to Thesaurus in 1985.

thenardite
BT	sulfates
	.thenardite

theoretical models
UF	conceptual models
RT	models
SN	Used 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
BT	seismograms
	.theoretical seismograms
SN	Added to Thesaurus in 1981.

theoretical studies
UF	studies, theoretical
RT	experimental studies
	laboratory studies

theory
SN	A valid term through mid-1978. Use theoretical studies.

Thera
BT	Mediterranean region
	.Aegean Islands
	..Greek Aegean Islands
	...Cyclades
	....Thera
UF	Santorini
	Thira
RT	Santorin
SN	Volcanic island. The southernmost of the Cyclades in the Aegean Sea. Also search Santorin. This term has multiple hierarchies.

Therapsida
BT	Synapsida
	.Therapsida
NT	Cynodontia
	Dicynodontia
SN	Order.

Theria
BT	Chordata
	.Vertebrata
	..Tetrapoda
	...Mammalia
	....Theria
NT	Eutheria
	Metatheria
	Pantotheria
	Symmetrodonta
SN	Subclass.

thermal
SN	A valid term through 1977.

thermal alteration
RT	alteration
	color alteration index
	hydrothermal alteration
	magmatism
	thermal effects
SN	Before 1978, also search thermal AND alteration.

thermal alteration index
USE	color alteration index

thermal anal

thermal analysis
RT	analysis
	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
SN	Used 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
UF	thermal data
RT	Brillouin spectra
	thermal analysis
SN	Used for data and not for methodology. Added to Thesaurus in 1985.

thermal anomalies
UF	temperature anomaly
RT	anomalies
	geothermal fields
	heat flow
	hot springs
	hot spots
SN	Used as a general term. Use more specific terms (e.g. hot spots) if applicable. Added to Thesaurus in 1989.

thermal aureole
USE	aureoles

thermal circulation
RT	circulation
	ocean circulation
SN	Before 1978, also search oceans AND circulation AND thermal.

thermal conductivity
RT	conductivity
	electrical conductivity
	geothermal gradient
	heat flow
	measurement
	specific heat
	thermal diffusivity
	thermal inertia
SN	Before 1976, also search conductivity.

thermal data
USE	thermal analysis data

thermal demagnetization
BT	demagnetization
	.thermal demagnetization
RT	geophysics
	magnetization
	paleomagnetism
	remanent magnetization
SN	Added to Thesaurus in 1981.

thermal diffusivity
UF	diffusivity, thermal
RT	heat flow
	thermal conductivity
	diffusivity

thermal discharge
USE	thermal pollution

thermal effects
RT	effects
	thermal alteration
SN	Added to Thesaurus in 1981.

thermal emission
UF	emission, thermal
RT	remote sensing
	infrared methods
	emissivity

thermal emissivity
USE	emissivity

thermal energy storage
USE	heat storage

thermal evolution
SN	As of 1993, use thermal maturity for petroleum or thermal alteration or thermal history.

thermal expansion
UF	expansion, thermal
RT	properties
	stress
	strain
	expansive materials
	thermodynamic properties
	expansion
	thermal properties
	thermomechanical properties
SN	Added to Thesaurus in 1995.

thermal gradient
SN	Not a valid term for GeoRef. See geothermal gradient if applicable.

thermal history
RT	geosynclines
	P-T-t paths
	paleotemperature
	temperature
	thermal maturity
	thermal regime
	thermochronology
SN	Before 1993, also search thermal evolution.

thermal inertia
RT	heat flow
	specific heat
	thermal conductivity
	thermal properties
	thermodynamic properties
SN	Added to Thesaurus in 1985.

Thermal Infrared Multispectral Scanner
RT	infrared methods
	multispectral scanner
	remote sensing
	thermal ionization mass spectroscopy
SN	Before 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
BT	spectroscopy
	.mass spectroscopy
	..thermal ionization mass spectroscopy
RT	absolute age
	heat flow
	Thermal Infrared Multispectral Scanner
	uranium disequilibrium
SN	Before 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
USE	thermal maturity

thermal maturity
UF	thermal maturation
RT	maturity
	biomarkers
	petroleum
	color alteration index
	thermal history
SN	Before 1993, also search thermal evolution and petroleum. Added to Thesaurus in 1985.

thermal metamorphism
BT	metamorphism
	.thermal metamorphism
UF	thermometamorphism
SN	Not a valid index term through 1977. Before 1978, also search metamorphism AND thermal.

thermal methods
SN	Not a valid GeoRef index term after 1971. Used in subfiles G and N. See heat flow or thermal analysis.

thermal pollution
UF	thermal discharge
RT	pollution
	waste disposal
SN	Before 1978, also search pollution AND thermal.

thermal properties
RT	heat capacity
	permafrost
	physical properties
	properties
	specific heat
	temperature
	thermal expansion
	thermal inertia
	engineering geology
	thermochemical properties
	thermodynamic properties
	thermoelastic properties
	thermomechanical properties

thermal recovery
UF	heat treatment
RT	tertiary recovery
	enhanced recovery
	recovery
SN	Added to Thesaurus in 1985.

thermal regime
RT	geothermal systems
	heat flow
	hydrogeology
	thermal history
	engineering geology
SN	Added to Thesaurus in 1981.

thermal remanent magnetization
USE	thermoremanent magnetization

thermal springs
USE	hot springs

thermal surveys
USE	heat flow

thermal waters
RT	brines
	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
RT	calorimetry
	chemical properties
	properties
	thermal properties
	geochemistry

thermochemical remanent magnetization
BT	magnetization
	.remanent magnetization
	..thermochemical remanent magnetization
RT	paleomagnetism
SN	Added to Thesaurus in 1981.

thermochronology
RT	absolute 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
SN	Determination 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
RT	geothermal gradient
	lakes
	ocean circulation
	temperature
SN	Added to Thesaurus in 1989.

thermodynamic properties
RT	enthalpy
	entropy
	free energy
	fugacity
	isotherms
	Kirchhoff integral
	properties
	specific heat
	thermal expansion
	thermal inertia
	thermal properties
	geochemistry
	thermomechanical properties

thermoelastic properties
RT	elastic properties
	mechanical properties
	physical properties
	properties
	thermal properties
SN	Added to Thesaurus in 1989.

thermography
USE	differential thermal analysis

thermogravimetric anal

thermogravimetric analysis
UF	thermogravimetry
RT	chemical analysis
	analysis
	differential thermal analysis
	thermal analysis
	TGA data

thermogravimetry
USE	thermogravimetric analysis

thermohaline circula

thermohaline circulation
RT	circulation
	ocean circulation
SN	Before 1978, also search oceans AND circulation AND thermohaline.

thermokarst
UF	cryokarst
RT	glacial geology
	permafrost
	geomorphology
	karst
	frost action
	periglacial features
	ground ice
	suffosion
	pseudokarst

thermoluminescence
RT	fluorescence
	geochronology
	irradiation
	luminescence
	relative age

thermomagnetic analysis
RT	analysis
	thermal analysis

thermomechanical properties
UF	thermophysical properties
RT	physical properties
	mechanical properties
	thermodynamic properties
	thermal expansion
	thermal properties
SN	Added to Thesaurus in 1985.

thermometamorphism
USE	thermal metamorphism

thermometry
SN	A valid term through mid-1978. Use geologic thermometry.

thermonatrite
BT	carbonates
	.thermonatrite

thermophilic taxa
RT	bacteria
	faunal studies
	floral studies
	hydrothermal conditions
	hydrothermal vents
	living taxa
	ocean floors
SN	Indexed with specific type. Added to Thesaurus in 1998.

thermophysical properties
USE	thermomechanical properties

thermoremanence
USE	thermoremanent magnetization

thermoremanent magnetization
BT	magnetization
	.remanent magnetization
	..thermoremanent magnetization
UF	thermal remanent magnetization
	thermoremanence
	TRM
RT	paleomagnetism
	magnetic field
	Curie point
	partial thermoremanent magnetization
	Thellier Method

Theropoda
BT	Chordata
	.Vertebrata
	..Tetrapoda
	...Reptilia
	....Diapsida
	.....Archosauria
	......Saurischia
	.......Theropoda
NT	Carnosauria
RT	Smilodon
SN	Suborder. This term has multiple hierarchies.

theses
UF	dissertations
RT	education
	publications
	monographs
SN	Added to Thesaurus in 1982.

Thessaloniki Greece
USE	Salonika Greece

Thessaly Greece
BT	Europe
	.Southern Europe
	..Greece
	...Thessaly Greece
RT	Pindus Mountains
	Olympus
	Othrys
SN	Administrative region in E central Greece.

Thetford Mines
BT	Canada
	.Eastern Canada
	..Quebec
	...Thetford Mines
RT	mines
	asbestos deposits
SN	City and site of asbestos mines about 50 miles S of Quebec City in S Quebec. Also search Thetford AND Quebec.

Thetis Regio
BT	Venus
	.Aphrodite Terra
	..Thetis Regio
SN	Highland massif, W Aphrodite Terra.

thick-skinned tectonics
BT	tectonics
	.thick-skinned tectonics
RT	basement tectonics
	thrust faults
	neotectonics
	crustal thickening
	thin-skinned tectonics
SN	Added to Thesaurus in 1998.

thickness
RT	crust
	crustal thickening
	crustal thinning
	ice sheets
	isochores

thin sections
RT	cross sections
	electron microscopy
	microfacies
	microscope methods
	petrography
	polished sections
	samples

thin-skin tectonics
USE	thin-skinned tectonics

thin-skinned tectonics
BT	tectonics
	.thin-skinned tectonics
UF	thin-skin tectonics
RT	crust
	tectonophysics
	thick-skinned tectonics
	crustal thinning
SN	Added to Thesaurus in 1989.

Thiobacillus ferrooxidans
BT	bacteria
	.Thiobacillus ferrooxidans
RT	microfossils
	biodegradation
	oxidation
SN	Species. For paleontologic studies, index microfossils.

Thira
USE	Thera

Third World
USE	developing countries

thixotropy
RT	clay
	colloidal materials
	gels
	mechanical properties
	properties
	soil mechanics
	strength
	engineering geology
SN	Added to Thesaurus in 1982.

tholeiite
BT	igneous rocks
	.volcanic rocks
	..basalts
	...tholeiite
RT	ocean-island basalts
	tholeiitic composition
	olivine tholeiite

tholeiitic basalt
BT	igneous rocks
	.volcanic rocks
	..basalts
	...tholeiitic basalt

tholeiitic composition
RT	basalts
	composition
	igneous rocks
	tholeiite
SN	Before 1978, search tholeiitic.

tholeiitic dolerite
BT	igneous rocks
	.plutonic rocks
	..diabase
	...tholeiitic dolerite

Thomar Portugal
USE	Tomar Portugal

Thomas County Georgia
BT	United States
	.Georgia
	..Thomas County Georgia

Thomas County Kansas
BT	United States
	.Kansas
	..Thomas County Kansas

Thomas County Nebraska
BT	United States
	.Nebraska
	..Thomas County Nebraska

Thomas Range
BT	United States
	.Utah
	..Thomas Range
RT	Tooele County Utah
	Juab County Utah
	Spor Mountain
SN	W Utah. Indexed with counties as applicable. Added to Thesaurus in 1981.

Thompson nickel belt
BT	Canada
	.Western Canada
	..Manitoba
	...Thompson nickel belt
RT	metallogenic provinces
SN	Metallogenic province, N Manitoba. Added to Thesaurus in 1985.

thomsenolite
BT	halides
	.fluorides
	..thomsenolite

Thomson Formation
BT	Chronostratigraphic Units
	.Precambrian
	..Proterozoic
	...Paleoproterozoic
	....Thomson Formation
UF	Thomson Slate
RT	Wisconsin
	Minnesota
	Animikie Group
	Virginia Formation
SN	NE 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
USE	Thomson Formation

Thomson-Haskell analysis
RT	analysis
	seismology
SN	Added to Thesaurus in 1981.

thomsonite
BT	silicates
	.framework silicates
	..zeolite group
	...thomsonite

thorianite
BT	oxides
	.thorianite

thorite
BT	silicates
	.orthosilicates
	..nesosilicates
	...thorite

thorium
BT	metals
	.actinides
	..thorium
NT	Th-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
UF	Th
RT	Io/Th
	Io/U
	isotopes
	Pb/Th
	HIMU
	Th/U
	U/Th/Pb
	thorium ores
	Th/Th
SN	Chemical element. Use thorium ores for thorium as a commodity.

thorium ores
BT	metal ores
	.thorium ores
RT	monazite deposits
	thorium

thorium-lead
USE	Pb/Th

thorium-uranium
USE	Th/U

Thorn Poland
USE	Torun Poland

thoron
USE	Rn-222

thortveitite
BT	silicates
	.orthosilicates
	..sorosilicates
	...thortveitite

Thrace
BT	Europe
	.Thrace
NT	Greek Thrace
RT	Turkey
	Greece
SN	Administrative region in extreme NE Greece (Western Thrace), and all of Turkey in Europe (Eastern Thrace). Indexed with countries as applicable.

Three Forks Montana
BT	United States
	.Montana
	..Gallatin County Montana
	...Three Forks Montana
SN	Town in SW Montana.

Three Gorges, Yangtze
USE	Yangtze Three Gorges

Three Rivers
SN	Not a valid term for GeoRef. See Sanjiang for region in China.

three-component seismographs
BT	seismographs
	.three-component seismographs
RT	PANDA
SN	Added to Thesaurus in 1981.

three-dimensional methods
RT	boreholes
	geophysical surveys
	prestack migration
	seismic methods
	techniques
	geophysical methods
SN	Also 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
RT	asperities
	computer animation
	four-dimensional models
	mathematical models
	models
	MODFLOW
	MODPATH
	one-dimensional models
	seismology
	two-dimensional models
	visualization
SN	Before 1978, search three-dimensional AND models.

Throckmorton County Texas
BT	United States
	.Texas
	..Throckmorton County Texas

thrombolites
BT	sedimentary structures
	.biogenic structures
	..thrombolites
RT	algal structures
	stromatolites
SN	Added to Thesaurus in 1993.

thrust
SN	A valid term through 1977. After 1977, see thrust faults. After 1988, also see thrust sheets.

thrust faults
BT	faults
	.thrust faults
UF	reverse slip faults
	thrust slip faults
	thrusts and thrusting
RT	overthrust 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
SN	Before 1978, also search faults AND thrust. See overthrust faults; compression tectonics.

thrust plates
USE	thrust sheets

thrust sheets
UF	thrust plates
RT	tectonics
	faults
	fold and thrust belts
	thrust faults
	neotectonics
	piggyback basins
SN	Added to Thesaurus in 1989.

thrust slip faults
USE	thrust faults

thrusts and thrusting
USE	thrust faults

Thule Greenland
BT	Arctic region
	.Greenland
	..Thule Greenland
SN	Settlement on coast of Hayes Peninsula N of Cape York in NW Greenland. U.S. Air Force base nearby.

thulium
BT	metals
	.rare earths
	..thulium
UF	Tm

Thunder Bay
BT	Canada
	.Eastern Canada
	..Ontario
	...Thunder Bay
RT	Lake Superior
	Thunder Bay District Ontario
SN	Refers only to the inlet of NW Lake Superior. For the city on the bay, see Thunder Bay Ontario.

Thunder Bay District Ontario
BT	Canada
	.Eastern Canada
	..Ontario
	...Thunder Bay District Ontario
NT	Manitouwadge Ontario
	Marshall Lake
	Northern Light Lake
	Thunder Bay Ontario
UF	District of Thunder Bay
RT	Michipicoten Island
	Thunder Bay
SN	N Ontario.

Thunder Bay Ontario
BT	Canada
	.Eastern Canada
	..Ontario
	...Thunder Bay District Ontario
	....Thunder Bay Ontario
SN	Refers only to the city on the bay. For the inlet of NW Lake Superior, see Thunder Bay.

thunder eggs
USE	geodes

thunderstorms
SN	As of 1993, no longer a valid term for GeoRef. Usually out-of-scope. Used with meteorology. After 1993, see storms.

Thur Valley
BT	Europe
	.Central Europe
	..Switzerland
	...Thur Valley
SN	River valley SSW of Lake Constance extending to the Rhine River. Also search Thur River.

Thuringer Wald
USE	Thuringian Forest

Thuringia Basin
USE	Thuringian Basin

Thuringia Germany
BT	Europe
	.Central Europe
	..Germany
	...Thuringia Germany
NT	Erfurt Germany
	Gera Germany
	Ruhla Germany
	Schlotheim Germany
	Schneeberg Germany
	Schwarzburg Anticlinorium
	Steinach Germany
	Taubach Germany
	Weimar Germany
RT	Rhon 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
SN	State in central Germany. Includes the Thuringian Forest. Before 1993, also search Erfurt Bezirk or Gera Bezirk if applicable.

Thuringian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Permian
	....Thuringian
RT	Saxothuringian
SN	Added to Thesaurus in 1981.

Thuringian Basin
BT	Europe
	.Central Europe
	..Germany
	...Thuringian Basin
UF	Thuringia Basin
RT	Thuringia Germany
SN	Thuringian Forest region in Thuringia. Indexed with states as applicable.

Thuringian Forest
BT	Europe
	.Central Europe
	..Germany
	...Thuringian Forest
UF	Thuringer Wald
RT	Thuringia Germany
	Franconian Forest
	Ruhla Germany
	Steinach Germany
SN	Forested mountain range extending NW-SE in Thuringia.

Thuringian Hills
BT	Europe
	.Central Europe
	..Germany
	...Thuringian Hills
RT	Thuringia Germany
SN	Region in Germany. Indexed with states as applicable. Added to Thesaurus in 1981.

Thuringian Massif
BT	Europe
	.Central Europe
	..Germany
	...Thuringian Massif
RT	Thuringia Germany
SN	Region in Germany. Indexed with states as applicable. Added to Thesaurus in 1981.

Thurston County Nebraska
BT	United States
	.Nebraska
	..Thurston County Nebraska
SN	NE Nebraska.

Thurston County Washington
BT	United States
	.Washington
	..Thurston County Washington
NT	Tono Washington
SN	W Washington.

Thysanoptera
BT	Invertebrata
	.Arthropoda
	..Mandibulata
	...Insecta
	....Pterygota
	.....Neoptera
	......Exopterygota
	.......Thysanoptera
UF	Thysanopteroida
SN	Order.

Thysanopteroida
USE	Thysanoptera

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