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Du Page County Illinois
BT	United States
	.Illinois
	..Du Page County Illinois

Dubai
BT	Asia
	.Arabian Peninsula
	..United Arab Emirates
	...Dubai
SN	Emirate. One of federation of 7 states at S end of Persian Gulf.

Dublin Ireland
BT	Europe
	.Western Europe
	..Ireland
	...Dublin Ireland
SN	County and city on Irish Sea in E Ireland.

Dubois County Indiana
BT	Indiana
	.Dubois County Indiana

Dubuque County Iowa
BT	United States
	.Iowa
	..Dubuque County Iowa

Dubuque Format

Dubuque Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Ordovician
	....Middle Ordovician
	.....Dubuque Formation
RT	Iowa
	Illinois
	Wisconsin
	Minnesota
SN	NW Illinois, E Iowa, SE Minnesota and SW Wisconsin. Added to Thesaurus in 1989.

Duchesne County Utah
BT	United States
	.Utah
	..Duchesne County Utah
SN	NE Utah.

Duchesne River For

Duchesne River Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Duchesne River Formation
RT	Eocene
	Oligocene
	Utah
	Colorado
SN	Eocene or Oligocene. Unconformably underlies Bishop Conglomerate; unconformably overlies Uinta and Uinta (?) Formation. NW Colorado and NE Utah. Indexed with ages as applicable.

Duck North Carolina
BT	United States
	.North Carolina
	..Dare County North Carolina
	...Duck North Carolina
RT	Outer Banks
SN	Locale on Bodie Island, North Carolina's Outer Banks. Indexed with Outer Banks if applicable.

Ducktown Tennessee
BT	United States
	.Tennessee
	..Polk County Tennessee
	...Ducktown Tennessee
SN	Town in extreme SE Tennessee.

ductile deformation
BT	deformation
	.ductile deformation
RT	engineering geology
	rock mechanics
	mechanical properties
	ductility
	fracture strength
SN	Added to Thesaurus in 1989.

ductility
RT	deformation
	ductile deformation
	rock mechanics

Dudley England
BT	Europe
	.Western Europe
	..United Kingdom
	...Great Britain
	....England
	.....Dudley England
RT	Midlands
	Northumberland England
	Staffordshire England
SN	Town SW of Birmingham in West Midlands, W central England. Also occurs in other locations. Indexed with county as applicable.

Duero Basin
BT	Europe
	.Southern Europe
	..Iberian Peninsula
	...Duero Basin
RT	Spain
	Portugal
	Duero River
SN	Added to Thesaurus in 1981.

Duero River
BT	Europe
	.Southern Europe
	..Iberian Peninsula
	...Duero River
UF	Douro River
RT	Spain
	Portugal
	Duero Basin
SN	River in Spain and Portugal. Rises in central Spain, flows W to NE Portugal, then S along border, and W to Atlantic Ocean. Added to Thesaurus in 1985.

Dufek Intrusion
BT	Antarctica
	.Dufek Intrusion
RT	Pensacola Mountains
SN	In the Dufek Massif area of Forrestal Range in the Pensacola Mountains of Edith Ronne Land S of the Weddell Sea.

Dufferin County Ontario
BT	Canada
	.Eastern Canada
	..Ontario
	...Dufferin County Ontario

dufrenoysite
BT	sulfosalts
	.sulfarsenites
	..dufrenoysite

Dugger Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Carboniferous
	....Pennsylvanian
	.....Middle Pennsylvanian
	......Dugger Formation
RT	Indiana
SN	SE Indiana. Added to Thesaurus in 1989.

Dukes County Massachusetts
BT	United States
	.Massachusetts
	..Dukes County Massachusetts

Dukla Poland
BT	Europe
	.Central Europe
	..Poland
	...Dukla Poland
SN	Town in Krosno Province, SE Poland.

Duluth Complex
BT	United States
	.Minnesota
	..Duluth Complex
RT	Precambrian
SN	In NE Minnesota. Indexed with counties as applicable.

Duluth Minnesota
BT	United States
	.Minnesota
	..Saint Louis County Minnesota
	...Duluth Minnesota
SN	City at extreme W end of Lake Superior in NE Minnesota.

dumortierite
BT	silicates
	.orthosilicates
	..nesosilicates
	...dumortierite

Duna River
USE	Danube River

Dunai River
USE	Danube River

Dunantul
USE	Transdanubia

Dunarea River
USE	Danube River

Dunau River
USE	Danube River

Dunbarton

Dunbarton Basin
BT	United States
	.Dunbarton Basin
RT	South Carolina
	Savannah River Plant
	Georgia
	Atlantic Coastal Plain
	Savannah River
SN	Buried Triassic basin, Savannah River valley, Georgia and South Carolina. Indexed with counties as applicable.

Dundas County Ontario
BT	Canada
	.Eastern Canada
	..Ontario
	...Dundas County Ontario

Dundee Limestone
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Devonian
	....Middle Devonian
	.....Dundee Limestone
RT	Ontario
	Ohio
	Michigan
SN	S Michigan, N Ohio and S Ontario. Added to Thesaurus in 1989.

Dundee Scotland
BT	Europe
	.Western Europe
	..United Kingdom
	...Great Britain
	....Scotland
	.....Dundee Scotland
RT	Angus Scotland
SN	City in Angus County, Tayside region, on Firth of Tay on North Sea.

Dunderberg Shale
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Cambrian
	....Upper Cambrian
	.....Dunderberg Shale
RT	Utah
	California
	Nevada
	Nopah Formation
SN	In Nopah Formation. Added to Thesaurus in 1989.

Dundy County Nebraska
BT	United States
	.Nebraska
	..Dundy County Nebraska

dune rock
USE	eolianite

dune structures
BT	sedimentary structures
	.bedding plane irregularities
	..dune structures
RT	dunes
SN	Before 1984, search dunes AND sedimentary structures. Added to Thesaurus in 1984.

Dunedin New Zealand
BT	Australasia
	.New Zealand
	..Otago New Zealand
	...Dunedin New Zealand
RT	South Island
SN	City on Pacific Ocean in SE South Island. Also index South Island.

dunes
NT	barchans
	coastal dunes
	continental dunes
	foredunes
	submarine dunes
UF	sand dunes
RT	geomorphology
	eluvium
	antidunes
	bedding plane irregularities
	sand waves
	eolian features
	shore features
	sand ridges
	blowouts
	ergs
	sand seas
	sand sheets
	dune structures
SN	As of 1984, use dune structures for the sedimentary structure.

Dunham Dolomite
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Cambrian
	....Lower Cambrian
	.....Dunham Dolomite
RT	Quebec
	Vermont
SN	S Quebec; NW and W central Vermont. Added to Thesaurus in 1989.

dunite
BT	igneous rocks
	.plutonic rocks
	..ultramafics
	...peridotites
	....dunite

Dunkard Basin
BT	United States
	.Dunkard Basin
RT	Ohio
	Pennsylvania
	West Virginia
SN	In West Virginia, Ohio, and Pennsylvania. Structural basin. Indexed with states as applicable.

Dunkard Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Dunkard Group
RT	Permian
	Pennsylvanian
	Ohio
	Pennsylvania
	Maryland
	West Virginia
SN	Pennsylvanian and Permian. Includes Washington and Greene formations. W Maryland, E Ohio, SW Pennsylvania, and N West Virginia. Indexed with ages as applicable.

Dunkerque France
USE	Dunkirk France

Dunkirk France
BT	Europe
	.Western Europe
	..France
	...Nord France
	....Dunkirk France
UF	Dunkerque France
SN	City at S end of North Sea.

Dunklin County Missouri
BT	United States
	.Missouri
	..Dunklin County Missouri

Dunlin Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Jurassic
	....Lower Jurassic
	.....Dunlin Group
RT	North Sea
SN	Includes Drake Formation, Cook Formation, Burton Formation, and Amundsen Formation. Added to Thesaurus in 1995.

Dunn County North Dakota
BT	United States
	.North Dakota
	..Dunn County North Dakota
SN	W central North Dakota.

Dunn County Wisconsin
BT	United States
	.Wisconsin
	..Dunn County Wisconsin
SN	W Wisconsin.

Dunnage Melange
RT	Dunnage Zone
	Eastern Canada
	Newfoundland
SN	North-central Newfoundland. Before 1998, this was often used for the larger area of the Dunnage Zone. Indexed with Canadian provinces or regions as applicable.

Dunnage Terrane
USE	Dunnage Zone

Dunnage Zone
UF	Dunnage Terrane
RT	Quebec
	Appalachians
	Eastern Canada
	Maine
	Scotland
	Ireland
	Newfoundland
	New England
	Caledonides
	Dunnage Melange
	Iapetus
SN	Or 'terrane', Appalachian Orogen. Tectonostratigraphic zone including the Dunnage Melange of north-central Newfoundland, it is now sometimes extended to the New England Appalachians, and the Caledonides of N Ireland, and Scotland. Remains of the Iapetus O

Dunvegan Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Cenomanian
	......Dunvegan Formation
RT	Alberta
	British Columbia
	Yukon Territory
	Northwest Territories
SN	W Canada. At one time referred to as Fort Nelson Formation in the Liard River region. Added to Thesaurus in 1995.

Duperow Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Devonian
	....Upper Devonian
	.....Duperow Formation
RT	Saskatchewan
	Montana
	North Dakota
	Manitoba
	South Dakota
	Jefferson Group
SN	In Jefferson Group. North Dakota, NE Montana, NW South Dakota, Manitoba and Saskatchewan. Added to Thesaurus in 1985.

duplexes
RT	bedding faults
	decollement
	en echelon faults
	fault zones
	faults
	imbricate tectonics
	klippen
	thrust faults
SN	Before 1993, also search duplex fault zones and duplex structures if applicable. Added to Thesaurus in 1993.

Duplin County North Carolina
BT	United States
	.North Carolina
	..Duplin County North Carolina

Duplin Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Neogene
	....Miocene
	.....upper Miocene
	......Duplin Formation
RT	South Carolina
	Florida
	North Carolina
	Georgia
SN	Base of Duplin is an unconformity. Florida, E Georgia, E North Carolina, and E South Carolina.

durability
RT	degradation
	engineering properties
	mechanical properties
	rock mechanics
	soil mechanics
SN	Used in engineering studies. Added to Thesaurus in 1989.

durain
BT	macerals
	.durain
BT	lithotypes
	.durain
SN	This term has multiple hierarchies.

Durance Basin
BT	Europe
	.Western Europe
	..France
	...Durance Basin
SN	River basin in SE France.

Durance France
BT	Europe
	.Western Europe
	..France
	...Lot-et-Garonne France
	....Durance France
SN	Village in SW France.

Durango Mexico
BT	Mexico
	.Durango Mexico
NT	Mapimi Mexico
RT	Guerrero Terrane
	Sierra Madre Occidental
SN	State in W central Mexico. Also a city.

Durban South Africa
BT	Africa
	.Southern Africa
	..South Africa
	...KwaZulu-Natal South Africa
	....Durban South Africa
SN	City on the Indian Ocean.

Durham County North Carolina
BT	United States
	.North Carolina
	..Durham County North Carolina
SN	N central North Carolina.

Durham England
BT	Europe
	.Western Europe
	..United Kingdom
	...Great Britain
	....England
	.....Durham England
RT	Ingleton England
SN	County in NE England. In 1974, parts of Durham went to form Cleveland County and Tyne and Wear County.

duricrust
BT	sedimentary rocks
	.chemically precipitated rocks
	..duricrust
RT	soils
	weathering
	calcrete
	caliche
	weathering crust
	ferricrete
	silcrete

Dushambe Tajikistan
USE	Dushanbe Tajikistan

Dushanbe Tajikistan
BT	Asia
	.Tajikistan
	..Dushanbe Tajikistan
UF	Dushambe Tajikistan
	Stalinabad Tajikistan
RT	Nurek Tajikistan
SN	City in W Tajikistan. This term has multiple hierarchies.

dust
BT	sediments
	.clastic sediments
	..dust
RT	atmospheric transport
	volcanic ash
	terrigenous materials
	cosmic dust
	dust storms
	deflation
	interplanetary dust

dust clouds
SN	Use dust storms or planetesimals or ash clouds if applicable.

dust clouds (volcanic)
USE	ash clouds

dust storms
RT	atmospheric transport
	dust
	storms
SN	Also search dust clouds NOT extraterrestrial geology if applicable.

Dutch East Indies
USE	Indonesia

Dutch Guiana
USE	Surinam

Dutch New Guinea
USE	Irian Jaya Indonesia

Dutch West Indies
USE	Netherlands Antilles

Dutchess County New York
BT	United States
	.New York
	..Dutchess County New York
SN	SE New York.

Duval County Florida
BT	United States
	.Florida
	..Duval County Florida
SN	On the Atlantic Ocean in NE Florida.

Duval County Texas
BT	United States
	.Texas
	..Duval County Texas
SN	S Texas.

Duwi Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Duwi Formation
RT	Egypt
SN	Added to Thesaurus in 1989.

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