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Au
USE	gold

Aube France
BT	Europe
	.Western Europe
	..France
	...Aube France
SN	Department in N central France.

Aubrac
BT	Europe
	.Western Europe
	..France
	...Aubrac
SN	Mountain range in S central France.

aubrite
USE	chladnite

Auckland Islands
BT	West Pacific Ocean Islands
	.Auckland Islands
SN	200 miles south of New Zealand.

Auckland New Zealand
BT	Australasia
	.New Zealand
	..Auckland New Zealand
RT	North Island
SN	City in N North Island. Also Index North Island.

Aude France
BT	Europe
	.Western Europe
	..France
	...Aude France
NT	Corbieres
	Mouthoumet Massif
	Narbonne France
	Portel France
	Quillan France
	Salsigne Mine
RT	Montagne Noire

audio-magnetotelluric methods
USE	audiomagnetotelluric methods

audiomagnetotelluric methods
NT	CSAMT methods
UF	audio-magnetotelluric methods
RT	geophysical methods
	geophysical surveys
	magnetic methods
	Earth-current methods
	magnetotelluric methods
SN	Added to Thesaurus in 1985.

Audrain County Missouri
BT	United States
	.Missouri
	..Audrain County Missouri

Audubon County Iowa
BT	United States
	.Iowa
	..Audubon County Iowa

augen gneiss
BT	metamorphic rocks
	.gneisses
	..augen gneiss

Auger effect
USE	Auger spectroscopy

Auger spectroscopy
BT	spectroscopy
	.Auger spectroscopy
UF	Auger effect
	autoionization
RT	chemical analysis
	analysis
SN	Added to Thesaurus in 1982.

augite
BT	silicates
	.chain silicates
	..pyroxene group
	...clinopyroxene
	....augite
RT	basalts
	fassaite
	omphacite
	titanaugite

augitite
BT	igneous rocks
	.plutonic rocks
	..ultramafics
	...augitite

Auglaize County Ohio
BT	United States
	.Ohio
	..Auglaize County Ohio

Augusta County Virginia
BT	United States
	.Virginia
	..Augusta County Virginia
RT	Waynesboro Virginia
SN	NW Virginia. Also search Staunton Virginia and/or Waynesboro Virginia if applicable.

Augusta Maine
BT	United States
	.Maine
	..Kennebec County Maine
	...Augusta Maine
SN	City in S Maine.

Augustine
UF	Augustine Volcano
RT	volcanoes
	Southwestern Alaska
	Cook Inlet
SN	Volcano on Augustine Island in Kamishak Bay at mouth of Cook Inlet in S Alaska. Indexed with Southwestern Alaska if applicable.

Augustine Volcano
USE	Augustine

Augustow Poland
BT	Europe
	.Central Europe
	..Poland
	...Suwalki Poland
	....Augustow Poland
SN	Town in NE Suwalki, NE Poland.

aulacogens
RT	grabens
	tectonics
	troughs

aureoles
UF	contact aureole
	contact zone
	exomorphic zone
	metamorphic aureoles
	metamorphic zone
	thermal aureole
RT	metamorphism
	country rocks
	intrusions
	Barrovian-type deposits
	contact metamorphism
	haloes
	zoning

Aures
BT	Africa
	.North Africa
	..Algeria
	...Aures
SN	Mountain massif in NE Algeria.

Aurignacian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Stone Age
	....Paleolithic
	.....Aurignacian
RT	Pleistocene
	archaeology
	Quaternary
SN	Archaeological classification. Europe and N Africa. Added to Thesaurus in 1985.

aurora
SN	As of 1993, no longer a valid term for GeoRef. Usually out-of-scope.

Aurora County South Dakota
BT	United States
	.South Dakota
	..Aurora County South Dakota

auroral oval
SN	As of 1993, no longer a valid term. Usually out-of-scope for GeoRef.

auroral zone
SN	No longer a valid term. Usually out-of-scope for GeoRef. Before 1993, included auroral oval.

Austin Chalk
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Gulfian
	......Austin Chalk
RT	Louisiana
	Texas
	Austin Group
SN	Member of the Austin Group. E Texas and S Louisiana. Added to Thesaurus in 1989.

Austin County Texas
BT	United States
	.Texas
	..Austin County Texas

Austin Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Gulfian
	......Austin Group
RT	Texas
	Austin Chalk
SN	Comprises Ector Tongue, Bonham Clay, Blossom Sand, Brownstone Marl, Gober Tongue, Austin Chalk, and Burditt Marl. E Texas. Also search Austin Chalk.

Austin Texas
BT	United States
	.Texas
	..Travis County Texas
	...Austin Texas
SN	City in central Texas.

austinite
BT	arsenates
	.austinite

Austral Islands
BT	Oceania
	.Polynesia
	..French Polynesia
	...Austral Islands
UF	Tubuai Islands
RT	East Pacific Ocean Islands
	Pacific Ocean
SN	Group in French Oceania 330 miles S of Society Islands. Also search Austral.

Australasia
NT	Australia
	New Zealand
	Papua New Guinea
	Tasman orogenic zone
RT	Malay Archipelago
	New Guinea
	Oceania
	Solomon Islands
SN	Islands of the South Pacific including Australia, New Zealand, and Papua New Guinea. Before 1981, New Guinea was included as a narrower term. Indexed with countries as applicable.

Australia
BT	Australasia
	.Australia
NT	Amadeus Basin
	Australian Shield
	Broken Hill Block
	Carpentaria Basin
	Clarence-Moreton Basin
	Eucla Basin
	Gambier Embayment
	Georgina Basin
	Giles Complex
	Great Artesian Basin
	Joseph Bonaparte Gulf
	Lachlan fold belt
	Musgrave Ranges
	New England Batholith
	New South Wales Australia
	Northern Territory Australia
	Nullarbor Plain
	Officer Basin
	Otway Basin
	Perth Australia
	Queensland Australia
	Snowy Mountains
	South Australia
	Surat Basin
	Tasman Geosyncline
	Tasmania Australia
	Victoria Australia
	Western Australia
RT	Adelaidean
	Alice Springs Orogeny
	Arafura Sea
	Black Mountain
	Arunta Complex
	Australian Plate
	Baralaba Coal Measures
	Bass Strait
	Birkhead Formation
	Bitter Springs Formation
	Brockman Iron Formation
	Broken River Formation
	Bulldog Shale
	Bulli Seam
	Burra Group

Australia-Antarctica discordance
USE	Australian-Antarctic discordance

Australian Capital Territory
BT	Australasia
	.Australia
	..New South Wales Australia
	...Australian Capital Territory
NT	Canberra Australia
SN	SE Australia, within state of New South Wales. Formerly called Federal Capital Territory.

Australian Plate
RT	Australia
	Australian-Antarctic discordance
	Indo-Australian Plate
	New Guinea
	New Zealand
	plate tectonics
	plates
SN	May pre-date the more modern Indo-Australian Plate. Some may consider this the modern plate. Before 1993, also search Indian Plate and Australia. Indexed with geographic area and/or age as applicable. Added to Thesaurus in 1993.

Australian Shield
BT	Australasia
	.Australia
	..Australian Shield
SN	SW and central Australia.

Australian-Antarctic discor

Australian-Antarctic discordance
BT	Indian Ocean
	.Mid-Indian Ridge
	..Southeast Indian Ridge
	...Australian-Antarctic discordance
UF	Australia-Antarctica discordance
RT	plate tectonics
	plates
	Antarctic Plate
	mid-ocean ridges
	Australian Plate
	Indo-Australian Plate
SN	An anomalously deep and rough segment of the Southeast Indian Ridge, 120-128#DGE. Before 1998, also search (Antarctic Plate or Australian Plate) AND Southeast Indian Ridge.

australite
BT	tektites
	.australite
RT	meteorites

Australopithecinae
BT	minidae
	.Australopithecinae
NT	Australopithecus
SN	Subfamily.

Australopithecus
BT	minidae
	.Australopithecinae
	..Australopithecus
NT	Australopithecus afarensis
	Australopithecus africanus
	Australopithecus boisei
	Australopithecus robustus
SN	Genus.

Australopithecus afarensis
BT	minidae
	.Australopithecinae
	..Australopithecus
	...Australopithecus afarensis
SN	Species.

Australopithecus africanus
BT	minidae
	.Australopithecinae
	..Australopithecus
	...Australopithecus africanus
SN	Species.

Australopithecus boisei
BT	minidae
	.Australopithecinae
	..Australopithecus
	...Australopithecus boisei
SN	Species.

Australopithecus robustus
BT	minidae
	.Australopithecinae
	..Australopithecus
	...Australopithecus robustus
SN	Species.

Austria
BT	Europe
	.Central Europe
	..Austria
NT	Austrian Vienna Basin
	Burgenland Austria
	Carinthia Austria
	Central Austrian Alps
	Enns Valley
	Gailtal Alps
	Hochschwab
	Hohe Tauern
	Koralpe Range
	Lower Austria
	North Austrian Alps
	North Austrian Crystallines
	North Austrian Molasse
	Penninic Zone
	Salzburg State Austria
	Salzkammergut
	Semmering
	South Austrian Alps
	South Austrian Molasse
	Styria Austria
	Tauern Tunnel
	Totes Gebirge
	Tyrol Austria
	Upper Austria
	Venediger Group
	Vorarlberg Austria
	Wechsel
RT	Alps
	Allgau Alps
	Moldanubian
	Bohemian Massif
	Central Alps
	Danube River
	Danube Valley
	Eastern Alps
	Gosau Formation
	Hallstatt Limestone
	Lake Neusiedler
	Limestone Alps
	Molasse Basin
	Morava River valley
	Northern Limestone Alps
	Pannonia
	Pannonian Basin
	Rhaetia

Austrian Vienna Basin
BT	Europe
	.Central Europe
	..Austria
	...Austrian Vienna Basin
BT	Europe
	.Central Europe
	..Vienna Basin
	...Austrian Vienna Basin
SN	This term has multiple hierarchies. Added to Thesaurus in 1981.

Autauga County Alabama
BT	United States
	.Alabama
	..Autauga County Alabama

authigenesis
RT	authigenic minerals
	diagenesis
	minerals
	recrystallization
	sedimentary rocks

authigenetic minerals
USE	authigenic minerals

authigenic minerals
UF	authigenetic minerals
RT	minerals
	authigenesis
SN	Also search authigenic AND minerals.

authors
SN	Used in subfile N. See bibliography; biography; geologists.

autochthons
RT	allochthons
	overthrust faults
	tectonics
	windows

autocorrelation
BT	statistical analysis
	.autocorrelation
RT	mathematical geology
	crosscorrelation

autoionization
USE	Auger spectroscopy

automated analysis
RT	analysis
	chemical analysis
	data processing
	geochemical methods
	geophysical methods
	geophysical surveys
	quality control
	remote sensing
SN	For chemical analysis and geophysical surveys in which data acquisition and analysis are computerized. Added to Thesaurus in 1985.

automatic cartography
USE	digital cartography

automatic data processing
USE	data processing

autometamorphism
BT	metamorphism
	.autometamorphism
UF	autometasomatism
RT	igneous rocks
	processes
	albitization
	alteration
	hydrothermal alteration
	mineral assemblages

autometasomatism
USE	autometamorphism

autoradiography
BT	radiography
	.autoradiography
RT	geophysical methods
	analysis
	radioactivity
	X-ray radiography
SN	Before 2000, sometimes used for radiography.

autoregression
BT	statistical analysis
	.regression analysis
	..autoregression
RT	mathematical geology
	geostatistics
SN	Added to Thesaurus in 1985.

Autun France
BT	Europe
	.Western Europe
	..France
	...Saone-et-Loire France
	....Autun France
SN	Town in E central part of country.

Autunian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Permian
	....Lower Permian
	.....Autunian
RT	Rotliegendes
SN	Europe. Above Stephanian, below Saxonian.

autunite
BT	phosphates
	.autunite
RT	uranium ores

Auvergne
BT	Europe
	.Western Europe
	..France
	...Auvergne
SN	Historical region in S central France.

Auversian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....upper Eocene
	......Auversian
RT	Priabonian
SN	Europe. Above Lutetian, below Bartonian.

Aux Vases Sandstone
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Carboniferous
	....Mississippian
	.....Upper Mississippian
	......Chesterian
	.......Aux Vases Sandstone
RT	Missouri
	Illinois
	Indiana
	Illinois Basin
SN	SW Illinois, S Indiana and E Missouri. Added to Thesaurus in 1989.

Auxerre France
BT	Europe
	.Western Europe
	..France
	...Yonne France
	....Auxerre France
SN	City in NE central France.

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