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Yacoraite Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Yacoraite Formation
RT	Argentina
	Jujuy Argentina
	Salta Argentina
SN	In Jujuy and Salta, Argentina.

Yadkin County North Carolina
BT	United States
	.North Carolina
	..Yadkin County North Carolina

Yahagi River
BT	nshu
	.Yahagi River
RT	Aichi Japan
	Gifu Japan
SN	Flows into Chita Bay on the Pacific Ocean S of Nagoya in central Honshu. Also search Yahagi.

Yakataga Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Yakataga Formation
RT	Pliocene
	Pleistocene
	Holocene
	Miocene
	Alaska
	Middleton Island
SN	Middleton Island, SE Alaska. Indexed with ages as applicable. Added to Thesaurus in 1989.

Yake-Dake
BT	nshu
	.Yake-Dake
UF	Yakedake
	Yakeyama
RT	Nagano Japan
	Gifu Japan
SN	Peak NE of Kure in W Honshu. Indexed with prefecture as applicable.

Yakedake
USE	Yake-Dake

Yakeyama
USE	Yake-Dake

Yakima Basalt
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Neogene
	....Miocene
	.....Yakima Basalt
RT	Idaho
	Washington
	Oregon
	lower Pliocene
	upper Miocene
	Columbia River Basalt Group
	Grande Ronde Basalt
	Saddle Mountains Basalt
	Wanapum Basalt
SN	Upper Miocene. Formerly also included in lower Pliocene? Typical plateau basalt. In E Washington; also in Oregon and Idaho. Sometimes called the Yakima Basalt Subgroup of the Columbia River Basalt Group, it has been considered to have as members, the Wana

Yakima County Washington
BT	United States
	.Washington
	..Yakima County Washington
RT	Rattlesnake Hills
	Mount Adams
	Yakima Indian Reservation
SN	S Washington.

Yakima fold belt
BT	United States
	.Yakima fold belt
RT	Washington
	Oregon
	Columbia Plateau
	Columbia River Basalt Group
SN	Region of the Columbia Plateau, S-central Washington and N-central Oregon. Indexed with states and counties as applicable. Added to Thesaurus in 1993.

Yakima Indian Reservation
BT	United States
	.Washington
	..Yakima Indian Reservation
RT	Lewis County Washington
	Indian reservations
	Klickitat County Washington
	Yakima County Washington
SN	S central Washington. Indexed with counties as applicable. Added to Thesaurus in 1985.

Yakut A.S.S.R.
USE	Yakutia Russian Federation

Yakutat Bay
BT	United States
	.Alaska
	..Southern Alaska
	...Yakutat Bay
RT	Gulf of Alaska
	Yakutat Terrane
SN	SE Alaska, inlet of the Gulf of Alaska. Added to Thesaurus in 1981.

Yakutat Block
USE	Yakutat Terrane

Yakutat Terrane
BT	United States
	.Alaska
	..Yakutat Terrane
UF	Yakutat Block
RT	Southeastern Alaska
	Yakutat Bay
SN	SE Alaska. Added to Thesaurus in 1989.

Yakutia region
BT	Commonwealth of Independent States
	.Russian Federation
	..Siberian Platform
	...Yakutia region
RT	Yakutia Russian Federation
SN	Region which surrounds and includes the city of Yakutsk, extending past the Aldan River on the E and N. This term has multiple hierarchies. Indexed with oblasts or regions as applicable. Added to Thesaurus in 1981.

Yakutia Russian Federation
BT	Commonwealth of Independent States
	.Russian Federation
	..Yakutia Russian Federation
BT	Asia
	.Yakutia Russian Federation
NT	Aldan Plateau
	Aldan River
	Aldan Russian Federation
	Anabar Bay
	Anabar River
	Anabar Shield
	Arbarastakh
	Bolshoy Selerikan River
	Indigirka River
	Kular Range
	Mir Pipe
	New Siberian Islands
	Olenek River
	Orulgan Mountains
	Polousnyy
	Selennyakh River
	Seligdar Russian Federation
	Sutam River
	Tas-Khayakhtakh Range
	Udachnaya Pipe
	Udachnaya Russian Federation
	Verkhoyansk Range
	Verkhoyansk Russian Federation
	Yakutsk Russian Federation
	Yana River
	Yana-Indigirka Lowland
	Zyryanka Russian Federation
UF	Yakut A.S.S.R.
RT	Aldan Shield
	Lena Basin
	Siberia
	Olekma River
	Maya River basin
	Omolon River
	Sette-Daban Range
	Kolyma River
	Kolyma River basin
	Kolyma Uplift
	Mirnyy Russian Federation
	Popigay Structure
	Sta
SN	Former Yakut Autonomous Soviet Socialist Republic. Located in E central Siberia. Before 1993, Yakutia Russian Republic was also used. This term has multiple hierarchies.

Yakutsk Russian Federation
BT	Commonwealth of Independent States
	.Russian Federation
	..Yakutia Russian Federation
	...Yakutsk Russian Federation
SN	City on the bend of the Lena River in central Yakutia in E central Siberia. Before 1993, Yakutsk Russian Republic was also used. This term has multiple hierarchies.

Yalobusha County Mississippi
BT	United States
	.Mississippi
	..Yalobusha County Mississippi

Yalta Ukraine
BT	Europe
	.Ukraine
	..Crimea Ukraine
	...Yalta Ukraine
SN	City on the Black Sea in S Crimea. This term has multiple hierarchies.

Yamagata Japan
BT	nshu
	.Yamagata Japan
NT	Yonezawa Japan
RT	Chokai
	Tohoku
	Oguni Japan
	Zao
SN	Prefecture including city in N Honshu.

Yamaguchi Japan
BT	nshu
	.Yamaguchi Japan
NT	Ube coal field
RT	Chugoku
SN	City and prefecture in W Honshu.

Yamal
BT	Commonwealth of Independent States
	.Russian Federation
	..Tyumen Russian Federation
	...Yamal-Nenets Russian Federation
	....Yamal
UF	Yamal Peninsula
SN	Peninsula between the Kara Sea on the W and the Gulf of Ob on the E in the Yamal-Nenets National Okrug in NW Siberia. This term has multiple hierarchies.

Yamal Peninsula
USE	Yamal

Yamal-Nenets Russian Federation
BT	Commonwealth of Independent States
	.Russian Federation
	..Tyumen Russian Federation
	...Yamal-Nenets Russian Federation
NT	Taz Basin
	Urengoy Field
	Yamal
UF	Yamalo-Nenets Russian Federation
SN	National Okrug in N Tyumen Oblast in NW Siberia. Before 1993, Yamal-Nenets Russian Republic was also used. This term has multiple hierarchies.

Yamalo-Nenets Russian Federation
USE	Yamal-Nenets Russian Federation

Yamanashi Japan
BT	nshu
	.Yamanashi Japan
RT	Chubu Japan
	Akaishi Mountains
	Koma-ga-take
	Chiba Japan
	Fuji River
	Fujiyama
	Tanzawa Mountains
	Kanto Mountains
	Yatsugatake
SN	Prefecture W of Tokyo in central Honshu. Also a town E of Tokyo in Chiba Prefecture. Indexed with Chiba Japan if applicable.

Yamasaki Fault
BT	nshu
	.Yamasaki Fault
RT	Hyogo Japan
SN	Hyogo Prefecture, S Honshu, SW Japan. Added to Thesaurus in 1989.

Yamaska County Quebec
BT	Canada
	.Eastern Canada
	..Quebec
	...Yamaska County Quebec

Yamato Basin
BT	Pacific Ocean
	.North Pacific
	..Northwest Pacific
	...Japan Sea
	....Yamato Basin
RT	Leg 31
	DSDP Site 299
	DSDP Site 302
	Leg 127
	Leg 128
	ODP Site 794
	ODP Site 797
SN	SE Japan Sea. This term has multiple hierarchies.

Yamato Meteorites
BT	meteorites
	.Yamato Meteorites
RT	CR chondrites
	Antarctica
	Victoria Land
SN	Due to variants in numbering of these meteorites such as Yamato 791197, Y-791197, and Y74191, also truncate when searching. Before 1981, also search Yamato AND meteorites. Added to Thesaurus in 1981.

Yamato Mountains
BT	Antarctica
	.Victoria Land
	..Yamato Mountains
SN	In Victoria Land, Antarctica.

Yamato Rise
BT	Pacific Ocean
	.North Pacific
	..Northwest Pacific
	...Japan Sea
	....Yamato Rise
RT	Leg 127
	Leg 128
	ODP Site 799
SN	Central Japan Sea. This term has multiple hierarchies.

Yamhill County Oregon
BT	United States
	.Oregon
	..Yamhill County Oregon

Yamhill Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....Yamhill Formation
RT	Oregon
SN	Comprises Mill Creek Beds, of predominantly dark-gray shale and siltstone with occasional beds of lime-cemented sandstone, and an overlying sequence of massive sandstone beds which grades upward into more argillaceous rock. In W Oregon.

Yampa River
BT	United States
	.Colorado
	..Yampa River
RT	Moffat County Colorado
	Green River
	Routt County Colorado
SN	Tributary of the Green River, NW Colorado. Indexed with counties as applicable. Added to Thesaurus in 1985.

Yamuna River
USE	Jumna River

Yan Shan
USE	Yanshan Range

Yana River
BT	Commonwealth of Independent States
	.Russian Federation
	..Yakutia Russian Federation
	...Yana River
SN	Rises in the Verkhoyansk Range of N central Yakutia and flows N into the Laptev Sea. Also search Yana River region; Yana River basin; Yana. This term has multiple hierarchies.

Yana-Indigirka Depression
USE	Yana-Indigirka Lowland

Yana-Indigirka Lowland
BT	Commonwealth of Independent States
	.Russian Federation
	..Yakutia Russian Federation
	...Yana-Indigirka Lowland
UF	Yana-Indigirka Depression
SN	Coastal lowland comprising the area around the lower courses and the lower interfluve of the Indigirka River and the Yana in N central Yakutia. This term has multiple hierarchies.

Yancey County North Carolina
BT	United States
	.North Carolina
	..Yancey County North Carolina

Yang-tze River valley
USE	Yangtze River valley

Yangtze Plate
RT	Asia
	China
	Japan
	plates
	plate tectonics
SN	Central and S China. Also may include parts of Japan. Includes Yangtze Platform and the S China Caledonian folded area. Indexed with geographic area and/or age as applicable. Added to Thesaurus in 1993.

Yangtze Platform
BT	Asia
	.Far East
	..China
	...Yangtze Platform
RT	Anhui China
	Yellow Sea
	Chongqing China
	Sichuan China
	Yangtze River
	Hubei China
	Eurasian Plate
	Guizhou China
	Hunan China
	Jiangsu China
	Jiangxi China
	Yunnan China
	South China Block
SN	SE China. Includes nearly entire drainage basin of Yangtze River and S Yellow Sea. Rocks of Sinian, Cambrian, Silurian and Ordovician age. Indexed with provinces as applicable. Added to Thesaurus in 1993.

Yangtze River
BT	Asia
	.Far East
	..China
	...Yangtze River
UF	Chang Jiang River
	Changjiang Estuary
	Changjiang River
RT	Yangtze Platform
	Chongqing China
	Yangtze Three Gorges
	Yangtze River valley
SN	Sources in SW Qinghai. Flows into East China Sea N of Shanghai. Added to Thesaurus in 1985.

Yangtze River valley
BT	Asia
	.Far East
	..China
	...Yangtze River valley
UF	Yang-tze River valley
	Yangtze Valley
RT	Yangtze River
	Yangtze Three Gorges
SN	Valley of the Yangtze River, China. Added to Thesaurus in 1989.

Yangtze Three Gorges
BT	Asia
	.Far East
	..China
	...Yangtze Three Gorges
UF	Gorges District, Yangtze
	Sanxia (Yangtze)
	Three Gorges, Yangtze
RT	Chongqing China
	Sichuan China
	Yangtze River
	Hubei China
	Yangtze River valley
SN	E Sichuan and W Hubei provinces, E central China. Also search Three Gorges or Sanxia or Yangtze Gorges. Indexed with Sichuan China and/or Hubei China as applicable. Added to Thesaurus in 1995.

Yangtze Valley
USE	Yangtze River valley

Yankton County South Dakota
BT	United States
	.South Dakota
	..Yankton County South Dakota

Yanshan Range
BT	bei China
	.Yanshan Range
UF	Yan Shan
SN	Mountain range in Hebei, N China. Added to Thesaurus in 1989.

Yanshanian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Yanshanian
UF	Yanshanian Orogeny
	Yenshan
	Yenshanian
	Yenshanian Orogeny
RT	Jurassic
	Cretaceous
	China
SN	China. Indexed with ages as applicable. Added to Thesaurus in 1989.

Yanshanian Orogeny
USE	Yanshanian

Yaquina Bay
BT	United States
	.Oregon
	..Lincoln County Oregon
	...Yaquina Bay
UF	Yaquina Estuary
SN	Inlet of the Pacific Ocean at the mouth of the Yaquina River in W Oregon.

Yaquina Estuary
USE	Yaquina Bay

Yaracuy Venezuela
BT	South America
	.Venezuela
	..Yaracuy Venezuela
SN	State in NW Venezuela.

yardangs
RT	arid environment
	deserts
	eolian features
	erosion features
	wind erosion
	wind transport
	geomorphology
SN	Added to Thesaurus in 1989.

Yarlung Zangbo suture zone
USE	Indus-Yarlung Zangbo suture zone

Yarmouth County Nova Scotia
BT	Canada
	.Eastern Canada
	..Maritime Provinces
	...Nova Scotia
	....Yarmouth County Nova Scotia
NT	Yarmouth Nova Scotia
SN	W Nova Scotia.

Yarmouth Nova Scotia
BT	Canada
	.Eastern Canada
	..Maritime Provinces
	...Nova Scotia
	....Yarmouth County Nova Scotia
	.....Yarmouth Nova Scotia
SN	Town on the Atlantic Ocean in SW Nova Scotia.

Yaroslavl Russian Federation
BT	Commonwealth of Independent States
	.Russian Federation
	..Yaroslavl Russian Federation
BT	Europe
	.Yaroslavl Russian Federation
SN	Oblast including the city NE of Moscow on the Volga River. Before 1993, Yaroslavl Russian Republic was also used. This term has multiple hierarchies.

Yarrol Basin
BT	Australasia
	.Australia
	..Queensland Australia
	...Yarrol Basin
SN	Queensland.

Yass Basin
BT	Australasia
	.Australia
	..New South Wales Australia
	...Yass Basin
SN	River basin in SE New South Wales. Also search Yass.

Yates County New York
BT	United States
	.New York
	..Yates County New York
RT	Seneca Lake
SN	W central New York.

Yates Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Permian
	....Yates Formation
RT	New Mexico
	Texas
SN	In Artesia Group. A 50-foot sandstone that is subsurface in Texas, and subsurface and surface in New Mexico.

Yatsudake Mountain
USE	Yatsugatake

Yatsugatake
BT	nshu
	.Yatsugatake
UF	Yatsudake Mountain
RT	Nagano Japan
	Yamanashi Japan
	volcanoes
SN	Mountain peak NW of Tokyo in central Honshu.

Yavapai County Arizona
BT	United States
	.Arizona
	..Yavapai County Arizona
NT	Jerome Arizona
RT	Date Creek basin
SN	W Central Arizona.

Yazoo Clay
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....upper Eocene
	......Yazoo Clay
RT	Louisiana
	Mississippi
	Alabama
	Jackson Group
	Shubuta Member
SN	In Jackson Group. Divided into (ascending) North Creek Clay, Cocoa Sand, Pachuta Clay, and Shubuta Clay members. SW Alabama, central N Louisiana and Mississippi.

Yazoo County Mississippi
BT	United States
	.Mississippi
	..Yazoo County Mississippi

Yb
USE	ytterbium

Ybbs Meteorite
USE	Ybbsitz Meteorite

Ybbsitz Meteorite
BT	meteorites
	.stony meteorites
	..chondrites
	...Ybbsitz Meteorite
UF	Ybbs Meteorite
RT	Lower Austria
SN	Found in SW Lower Austria. Olivine-bronzite chondrite (H4). Added to Thesaurus in 1993.

Yeddo
SN	Not a valid term for GeoRef. See Tokyo Japan.

Yefremovka Meteorite
USE	Efremovka Meteorite

Yegua Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....middle Eocene
	......Yegua Formation
RT	Louisiana
	Mississippi
	Texas
	Claiborne Group
SN	In Claiborne Group. E and S Texas, NW Louisiana, and W and S Mississippi. Added to Thesaurus in 1985.

Yekaterinburg Russian Federation
BT	Commonwealth of Independent States
	.Russian Federation
	..Sverdlovsk Russian Federation
	...Yekaterinburg Russian Federation
UF	Ekaterinburg Russian Federation
SN	City in Sverdlovsk oblast, foothills of the Central Urals in W Siberia. Renamed after 1990. Before 1993, search Sverdlovsk Russian Republic. Indexed with Central Urals, Europe, or Asia if applicable.

Yelizavetgrad
SN	Not a valid term for GeoRef. See Kirovograd Ukraine.

Yell County Arkansas
BT	United States
	.Arkansas
	..Yell County Arkansas

yellow arsenic
USE	orpiment

Yellow Aster Complex
RT	Paleozoic
	Proterozoic
	Washington
SN	Proterozoic or Paleozoic?. Indexed with age as applicable. Added to Thesaurus in 1989.

Yellow Medicine County Minnesota
BT	United States
	.Minnesota
	..Yellow Medicine County Minnesota

Yellow River, China
USE	Huang He

Yellow Sea
BT	Pacific Ocean
	.North Pacific
	..Northwest Pacific
	...Yellow Sea
NT	Bohai Bay
UF	Huang Hai
	Huanghai Sea
	Hwang Hae
	Hwang Hai
RT	Yangtze Platform
	Shandong Peninsula
SN	Between NE China and the Korean Peninsula. This term has multiple hierarchies.

Yellowjacket Formation
BT	Chronostratigraphic Units
	.Precambrian
	..Yellowjacket Formation
RT	Idaho
	Belt Supergroup
SN	S central Idaho. Added to Thesaurus in 1985.

Yellowknife Group
BT	Chronostratigraphic Units
	.Precambrian
	..Archean
	...Yellowknife Group
RT	Northwest Territories
SN	Composed of quartzite, conglomerate, graywacke, meta-basalt, meta-andesite, dacite, rhyolite, tuff, agglomerate; undifferentiated gabbro. In Mackenzie District, Northwest Territories.

Yellowknife Northwest Territories
BT	Canada
	.Western Canada
	..Mackenzie District Northwest Territories
	...Yellowknife Northwest Territories
SN	Town on NW shore of Great Slave Lake at the mouth of the Yellowknife River in S Mackenzie District. This term has multiple hierarchies.

Yellowstone County Montana
BT	United States
	.Montana
	..Yellowstone County Montana
NT	Billings Montana
RT	Bighorn River
SN	S Montana.

Yellowstone Hot Spot
UF	Yellowstone Hotspot
RT	North America
	Western U.S.
	mantle plumes
	hot spots
SN	Added to Thesaurus in 1998.

Yellowstone Hotspot
USE	Yellowstone Hot Spot

Yellowstone National Park
BT	United States
	.Yellowstone National Park
UF	Yellowstone Park
RT	Idaho
	Wyoming
	Montana
	national parks
	Old Faithful Geyser
	Fremont County Idaho
	Gallatin Range
	Park County Wyoming
	Teton County Wyoming
	Yellowstone River
SN	Largest and oldest of U. S. national parks primarily in extreme NW Wyoming. Also search Yellowstone. Indexed with states and counties as applicable.

Yellowstone National Park County Montana
BT	United States
	.Montana
	..Yellowstone National Park County Montana

Yellowstone Park
USE	Yellowstone National Park

Yellowstone River
BT	United States
	.Yellowstone River
RT	Wyoming
	Montana
	North Dakota
	Rocky Mountains
	Yellowstone National Park
	Great Plains
	Tongue River
SN	Source is Yellowstone Lake, NW Wyoming. Joins Missouri River at Montana-North Dakota border. Indexed with counties or regions as applicable. Added to Thesaurus in 1985.

Yemen
BT	Asia
	.Arabian Peninsula
	..Yemen
NT	Aden Yemen
UF	Peoples Democratic Republic of Yemen
	South Arabia
	Southern Yemen
RT	Middle East
	Red Sea Rift
	Arabian Shield
	Kaidun Meteorite
	Near East
	Red Sea Basin
SN	After 1992, refers to Republic of Yemen which includes the former Yemen Arab Republic and the People's Democratic Republic of Yemen (Southern Yemen) which were united in 1990. Before 1993, used for Arab Republic of Yemen.

Yen Bai Vietnam
USE	Yenbay Vietnam

Yen Bay Vietnam
USE	Yenbay Vietnam

Yenbay Vietnam
BT	Asia
	.Far East
	..Vietnam
	...Yenbay Vietnam
UF	Yen Bai Vietnam
	Yen Bay Vietnam
SN	Town on the Red River NW of Hanoi in N Vietnam.

Yenisei
SN	Not a valid term for GeoRef. Use Yenisei Basin, Yenisei River, or Yenisei Ridge.

Yenisei Basin
BT	Asia
	.Yenisei Basin
RT	Russian Federation
	Mongolia
	Yenisei-Khatanga basin
SN	River basin which extends into N Mongolia in the S and drains the mountain areas W of Lake Baikal and much of the Central Siberian Plateau. Also search Yenisei. Indexed with Mongolia and/or Russian Federation as applicable.

Yenisei Range
USE	Yenisei Ridge

Yenisei Ridge
BT	Commonwealth of Independent States
	.Russian Federation
	..Siberian Platform
	...Yenisei Ridge
UF	Enisei Range
	Yenisei Range
	Yenisey Ridge
SN	Upland which extends N-S for 400 miles along the right bank of the Yenisei River between the Trans-Siberian R.R. and the Stony Tunguska River. A major gold-mining region. Also search Yenisei, Yenisey. This term has multiple hierarchies.

Yenisei River
BT	Commonwealth of Independent States
	.Russian Federation
	..Yenisei River
BT	Asia
	.Yenisei River
UF	Enisei River
	Yenisey River
SN	Rises in the E Sayan Mountains of E Tuva Autonomous Republic; it flows W for a short distance and then N across central Siberia into the Kara Sea via Yenisei Bay and Yenisei Gulf. Also search Yenisei. This term has multiple hierarchies.

Yenisei-Khatanga basin
BT	Asia
	.Yenisei-Khatanga basin
RT	Russian Federation
	Mongolia
	Khatanga Basin
	Yenisei Basin
SN	Combined drainage basin of the Khatanga River and the Yenisei River. The Khatanga Basin drains much of the northern Siberian Platform S of the Taymyr Peninsula. Indexed with Mongolia and/or Russian Federation as applicable.

Yenisey Ridge
USE	Yenisei Ridge

Yenisey River
USE	Yenisei River

Yenshan
USE	Yanshanian

Yenshanian
USE	Yanshanian

Yenshanian Orogeny
USE	Yanshanian

Yeoval Australia
BT	Australasia
	.Australia
	..New South Wales Australia
	...Yeoval Australia
SN	Village NW of Sydney in E central New South Wales.

Yerevan Armenia
BT	Europe
	.Armenia
	..Yerevan Armenia
UF	Erevan Armenia
	Erivan Armenia
SN	City on the Razdan River in W Armenia. This term has multiple hierarchies.

Yerington Nevada
BT	United States
	.Nevada
	..Lyon County Nevada
	...Yerington Nevada
SN	City on the Walker River in W Nevada.

Yermak Plateau
BT	Arctic Ocean
	.Yermak Plateau
RT	Leg 151
	ODP Site 910
	ODP Site 911
	ODP Site 912
	Norwegian Sea
SN	NW of Svalbard, Extending N from N Norwegian Sea.

Yeso Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Permian
	....Yeso Formation
RT	New Mexico
	Texas
SN	Added to Thesaurus in 1989.

Yessei Russian Federation
USE	Yessey Russian Federation

Yessey Russian Federation
BT	Commonwealth of Independent States
	.Russian Federation
	..Krasnoyarsk Russian Federation
	...Yessey Russian Federation
UF	Essei Russian Federation
	Yessei Russian Federation
SN	Village N of the Arctic Circle in N Evenk National Okrug in N central Siberia. Before 1993, Yessey Russian Republic was also used. This term has multiple hierarchies.

Yetropole Bulgaria
BT	Europe
	.Southern Europe
	..Bulgaria
	...Sofia Bulgaria
	....Yetropole Bulgaria
SN	Town ENE of Sofia in W central Bulgaria.

yield
USE	yields

yield strength
RT	compression
	deformation
	elastic limit
	elasticity
	fracture strength
	mechanical properties
	strength
	stress
	tension

yields
UF	yield
RT	soils
	fertilizers
	forests
	water yield
	fruits
	sediment yield
	tillage

Yilgarn
BT	Australasia
	.Australia
	..Western Australia
	...Yilgarn
UF	Yilgarn goldfield
RT	gold ores
SN	Gold field ENE of Perth in SW central Western Australia.

Yilgarn Block
BT	Australasia
	.Australia
	..Western Australia
	...Yilgarn Block
UF	Yilgarn Shield
RT	Eastern Goldfields
SN	Western Australia.

Yilgarn goldfield
USE	Yilgarn

Yilgarn Shield
USE	Yilgarn Block

Yishu Fault
BT	Asia
	.Far East
	..China
	...Yishu Fault
RT	Anhui China
	Tancheng-Lujiang fault zone
	Jilin China
	Shandong China
SN	Middle part of Tancheng-Lujiang fault zone, E and NE China. Indexed with provinces as applicable. Added to Thesaurus in 1993.

Ylojarvi Finland
BT	Europe
	.Western Europe
	..Scandinavia
	...Finland
	....Western Finland Province
	.....Ylojarvi Finland
SN	Village NW of Tampere in SW Finland. Copper and wolfram mines in area.

Yoakum County Texas
BT	United States
	.Texas
	..Yoakum County Texas
SN	W Texas.

Yokohama Japan
BT	nshu
	.Kanagawa Japan
	..Yokohama Japan
SN	City on W shore of Tokyo Bay in Kanagawa Prefecture in SE Honshu.

Yoldia Sea
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Quaternary
	....upper Quaternary
	.....Yoldia Sea
RT	Finland
	Baltic Sea
	Kola Peninsula
	Sweden
	Baltic Glaciation
	Baltic region
	Norway
SN	Upper Pleistocene to lower Holocene. Stage of Baltic Glaciation. Covered E Norway, Sweden, Baltic Sea, Finland, and parts of Kola Peninsula. Indexed with ages as applicable. Added to Thesaurus in 1993.

Yolla Bolly Terrane
BT	United States
	.California
	..Yolla Bolly Terrane
RT	Klamath Mountains
SN	Tectonostratigraphic terrane in the Klamath Mountains of N California. Indexed with counties as applicable. Added to Thesaurus in 1989.

Yolo County California
BT	United States
	.California
	..Yolo County California
RT	San Francisco Bay region
SN	Central California.

Yonezawa Japan
BT	nshu
	.Yamagata Japan
	..Yonezawa Japan
SN	City in Yamagata Prefecture in N Honshu.

Yongyang South Korea
BT	Asia
	.Far East
	..Korea
	...South Korea
	....Yongyang South Korea
SN	Village N of Taegu in E central South Korea. North Kyongsang.

Yonne France
BT	Europe
	.Western Europe
	..France
	...Yonne France
NT	Auxerre France
	Avallon France
	Tonnerre France
RT	Morvan
	Yonne Valley
SN	Department in NE central France.

Yonne River valley
USE	Yonne Valley

Yonne Valley
BT	Europe
	.Western Europe
	..France
	...Yonne Valley
UF	Yonne River valley
RT	Yonne France
	Seine-et-Marne France
	Nievre France
SN	River valley in central France. Indexed with departments as applicable.

York County Maine
BT	United States
	.Maine
	..York County Maine
RT	Great Bay
	Saco River
SN	Southernmost county in Maine.

York County Nebraska
BT	United States
	.Nebraska
	..York County Nebraska
RT	Big Blue River
SN	SE Nebraska.

York County New Brunswick
BT	Canada
	.Eastern Canada
	..Maritime Provinces
	...New Brunswick
	....York County New Brunswick

York County Pennsylvania
BT	United States
	.Pennsylvania
	..York County Pennsylvania
NT	York Pennsylvania
SN	S Pennsylvania.

York County South Carolina
BT	United States
	.South Carolina
	..York County South Carolina
SN	N South Carolina.

York County Virginia
BT	United States
	.Virginia
	..York County Virginia
SN	SE Virginia. Also search Poquoson Virginia and/or Williamsburg Virginia if applicable.

York England
BT	Europe
	.Western Europe
	..United Kingdom
	...Great Britain
	....England
	.....Yorkshire England
	......North Yorkshire England
	.......York England
SN	City in North Yorkshire in N England.

York Pennsylvania
BT	United States
	.Pennsylvania
	..York County Pennsylvania
	...York Pennsylvania
SN	City in S Pennsylvania.

York River
RT	Virginia
SN	An estuary receiving the Pamunkey River and the Mattaponi River at West Point and flowing SE to Chesapeake Bay. Also in other location. Indexed with counties or region as applicable.

York River Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Devonian
	....Lower Devonian
	.....York River Formation
RT	Quebec
SN	Gaspe Peninsula. Overlies Gaspe Limestone; overlain by Battery Point Formation. Added to Thesaurus in 1989.

Yorke Peninsula
BT	Australasia
	.Australia
	..South Australia
	...Yorke Peninsula
SN	Between Spencer Gulf on W and Gulf of Saint Vincent on E in SE South Australia. Indexed with state or region as applicable.

Yorkshire England
BT	Europe
	.Western Europe
	..United Kingdom
	...Great Britain
	....England
	.....Yorkshire England
NT	North Yorkshire England
	Sheffield England
RT	Holderness
	Humberside England
SN	Former county in N England. In 1974, it was split to form North Yorkshire, West Yorkshire, South Yorkshire, and parts of Cleveland and Humberside counties.

Yorktown Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Neogene
	....Pliocene
	.....Yorktown Formation
RT	South Carolina
	Virginia
	North Carolina
	Maryland
	Chesapeake Group
SN	In Chesapeake Group. Divisible into 2 major zones. Zone 1 (at base) corresponds to beds exposed at Raysor Bridge, South Carolina; Zone 2 (upper) includes: Uppermost Yorktown beds at Suffolk, Virginia, the beds at Yorktown, Virginia, and the Chama-bearing

Yosemite National Park
BT	United States
	.California
	..Yosemite National Park
UF	Yosemite Park
RT	national parks
	Madera County California
	Mariposa County California
	Tuolumne County California
SN	On W slope of the Sierra Madre in E central California. Also search Yosemite. Indexed with counties as applicable.

Yosemite Park
USE	Yosemite National Park

Yoshino River
BT	Asia
	.Far East
	..Japan
	...Shikoku
	....Yoshino River
RT	Kochi Japan
	Tokushima Japan
SN	Rises in mountains of NW and flows E to Kii Channel at Tokushima. Also search Yoshino.

Young County Texas
BT	United States
	.Texas
	..Young County Texas

Young's modulus
BT	elastic constants
	.Young's modulus
UF	stretch modulus
RT	elasticity

Younger Dryas
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Quarternary
	....Pleistocene
	.....Upper Pleistocene
	......Weichselian
	.......upper Weichselian
	........Younger Dryas
RT	Dryas
SN	Term used primarily in Europe for an interval of late-glacial time following the Allerod and preceding the Preboreal. Before 1978, search Dryas.

Younger Granites
RT	Egypt
	India
	Jurassic
	Niger
	Nigeria
	Precambrian
	Sudan
	West Africa
SN	Jurassic of S Niger and N Nigeria. Also used informally with Precambrian plutons in E Egypt, Sudan, and in S India. Search in combination with area. Indexed with age as applicable.

Younginiformes
USE	Eosuchia

Ypresian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....Ypresian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....lower Eocene
	......Ypresian
NT	London Clay
SN	Europe. Above Thanetian (Paleocene), below Cuisian.

ytterbium
BT	metals
	.rare earths
	..ytterbium
UF	Yb

yttrialite
BT	silicates
	.orthosilicates
	..sorosilicates
	...yttrialite

yttrium
BT	metals
	.rare earths
	..yttrium

Yuba County California
BT	United States
	.California
	..Yuba County California
RT	Feather River
SN	N central California.

Yucatan Basin
BT	Atlantic Ocean
	.North Atlantic
	..Caribbean Sea
	...Yucatan Basin
SN	Undersea feature between the Yucatan Peninsula and Belize on the W and S Cuba on the NE and E.

Yucatan Channel
BT	Atlantic Ocean
	.North Atlantic
	..Yucatan Channel
RT	Gulf of Mexico
	Caribbean Sea
SN	Strait between W tip of Cuba and NE Yucatan Peninsula connecting the Gulf of Mexico and the Caribbean Sea. Indexed with Caribbean Sea and/or Gulf of Mexico as applicable.

Yucatan Mexico
BT	Mexico
	.Yucatan Mexico
NT	Merida Mexico
RT	Gulf Coastal Plain
	Yucatan Peninsula

Yucatan Peninsula
RT	Belize
	Campeche Mexico
	Caribbean region
	Chicxulub Crater
	Guatemala
	Mexico
	Quintana Roo Mexico
	Yucatan Mexico
SN	Separates the Gulf of Mexico from the Caribbean Sea in SE Mexico, Belize, and N Guatemala. Indexed with countries as applicable.

Yucatan Shelf
BT	Atlantic Ocean
	.North Atlantic
	..Gulf of Mexico
	...Yucatan Shelf
RT	Campeche Bank
SN	N and W of the Yucatan Peninsula.

Yucca Flat
BT	United States
	.Nevada
	..Yucca Flat
RT	Yucca Mountain
	Nye County Nevada
	Nevada Test Site
SN	NNW of Frenchman Flat in the Nellis Air Force Range and AEC Nuclear Testing Site. Indexed with counties as applicable.

Yucca Mountain
BT	United States
	.Nevada
	..Nye County Nevada
	...Yucca Mountain
RT	waste disposal
	Apache Leap Tuff
	Basin and Range Province
	waste disposal sites
	Little Skull Mountain earthquake 1992
	Nevada Test Site
	Yucca Flat
SN	S Nevada. Added to Thesaurus in 1985.

Yudoma
SN	No longer a valid term for GeoRef. See Yudoma River or Yudoma Series or Yudomian as applicable.

Yudoma River
BT	Commonwealth of Independent States
	.Russian Federation
	..Yudoma River
BT	Asia
	.Yudoma River
RT	Khabarovsk Russian Federation
SN	Rises in extreme N Khabarovsk Kray in East Siberia and flows S and SW into the Maya River. Also search Yudoma. This term has multiple hierarchies. Indexed with Khabarovsk Russian Federation if applicable. Added to Thesaurus in 1995.

Yudoma Series
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Cambrian
	....Lower Cambrian
	.....Yudoma Series
RT	Russian Federation
	Siberia
SN	Homogeneous bed of gray dolomite and of dolomite limestone. In N Khabarovsk Kray and S Yakutia in E Siberia.

Yudomian
RT	Aldan Shield
	Cambrian
	Eocambrian
	Lower Cambrian
	Neoproterozoic
	Precambrian
	Proterozoic
	Russian Federation
	upper Precambrian
SN	Aldan Shield area, Russian Federation. Used most often to apply to Lower Cambrian, but some have used it to refer to Neoproterozoic. Indexed with additional age terms as applicable. Added to Thesaurus in 1985.

yugawaralite
BT	silicates
	.framework silicates
	..zeolite group
	...yugawaralite

Yugos

Yugoslav Macedonia
BT	Europe
	.Southern Europe
	..Macedonia
	...Yugoslav Macedonia
NT	Skopje Yugoslav Macedonia
RT	Yugoslavia
	Mediterranean region
	Balkan Peninsula
	Vardar Zone
	Serbo-Macedonian Massif
	Vardar River
SN	SW Balkan Peninsula. Before 1995, Yugoslavia was a broader term. Added to Thesaurus in 1981.

Yugoslavia
BT	Europe
	.Southern Europe
	..Yugoslavia
NT	Montenegro
	Serbia
UF	Federal Republic of Yugoslavia
RT	Adriatic region
	Croatia
	Dalmatia
	Mediterranean region
	Alps
	Balkan Peninsula
	Dinaric Alps
	Montenegro earthquake 1979
	Banat
	Danube River
	Danube Valley
	Eastern Alps
	Pannonia
	Bosnia-Herzegovina
	Neretva Valley
	Istria
	Karst region
	Serbo-Macedonian Massif
	Sloven
SN	Previously this term was also used as a broader term for Bosnia-Herzegovina, Croatia, Yugoslav Macedonia, and Slovenia which were part of a larger Yugoslavia. Since 1998, it is more often used with Serbia and Montenegro, which were left after the other re

Yukon
USE	Yukon Territory

Yukon River
BT	North America
	.Yukon River
RT	Alaska
	Yukon Territory
	Yukon-Koyukuk Basin
SN	Formed by confluence of Lewes and Pelly rivers in SW Yukon Territory. It flows NW into Alaska and then SE into Bering Sea S of Norton Sound. Indexed with Alaska and/or Yukon Territory as applicable.

Yukon Territory
BT	Canada
	.Western Canada
	..Yukon Territory
NT	Blow River
	Dawson Yukon Territory
	Donjek Glacier
	Donjek River
	Hess Mountains
	Kaskawulsh Glacier
	Keno Hill Yukon Territory
	Klondike
	Kluane Lake
	Mount Wood
	Ogilvie Mountains
	Royal Creek
	Selwyn Basin
	Steele Glacier
	Wernecke Mountains
	Whitehorse Yukon Territory
UF	Yukon
RT	Alexander Terrane
	Cache Creek Terrane
	Coast Mountains
	Beaver River
	Cache Creek
	Cassiar Mountains
	Chitistone Pass
	Indian River
	Denali Fault
	Earn Group
	Dunvegan Formation
	Eagle River
	Kayak Shale
	Intermontane Belt
	Liard River
	Mackenzie Mountains
	Michelle For
SN	NW Canada. Before 1971, also search Arctic America.

Yukon-Koyukuk Basin
BT	United States
	.Alaska
	..Yukon-Koyukuk Basin
UF	Koyukuk Basin
	Yukon-Koyukuk Province
RT	Southwestern Alaska
	Southern Alaska
	Northern Alaska
	Kaltag Fault
	East-Central Alaska
	West-Central Alaska
	Yukon River
SN	W Alaska. Extends from the Yukon Delta to the Brooks Range. Wedge-shaped expanse of Jurassic and Cretaceous sedimentary and igneous rocks. Indexed with Northern Alaska, West-Central Alaska, East-Central and/or Southern Alaska as applicable. Added to Thesa

Yukon-Koyukuk Province
USE	Yukon-Koyukuk Basin

Yukon-T

Yukon-Tanana Terrane
BT	North America
	.Yukon-Tanana Terrane
RT	Alaska
	British Columbia
	Yukon Territory
	Tintina Fault
SN	In North American Cordillera. Chiefly in Alaska and and Yukon Territory. Indexed with provinces and Alaska as applicable. Added to Thesaurus in 1993.

Yukon-Tanana Upland
BT	United States
	.Alaska
	..Yukon-Tanana Upland
RT	Southern Alaska
	East-Central Alaska
SN	Mountainous area between Yukon River and Tanana River in SE central Alaska. Indexed with East-Central Alaska or Southern Alaska as applicable.

Yule Marble
RT	Leadville Formation
	Mississippian
	Colorado
SN	Trade name for marble quarried from Leadville Limestone (Mississippian) in Gunnison County, Colorado. Used for geophysical studies.

Yuma Arizona
BT	United States
	.Arizona
	..Yuma County Arizona
	...Yuma Arizona
SN	City on the Colorado River in extereme SW Arizona.

Yuma County Arizona
BT	United States
	.Arizona
	..Yuma County Arizona
NT	Yuma Arizona
RT	Buckskin Mountains
	La Paz County Arizona
	Chocolate Mountains
	Date Creek basin
SN	SW Arizona. In 1983, N part became La Paz County.

Yuma County Colorado
BT	United States
	.Colorado
	..Yuma County Colorado
SN	NE Colorado.

Yunnan China
BT	Asia
	.Far East
	..China
	...Yunnan China
NT	Jinning China
	Kunming China
	Lufeng China
	Tengchong
RT	Yangtze Platform
	Luoquan Formation
	Kunyang Group
	Lancang-Gengma earthquake 1988
	Red River Fault
	Sanjiang
	Tonghai earthquake 1970
SN	Province in SW China.

Yuryuzan Russian Federation
BT	Commonwealth of Independent States
	.Russian Federation
	..Yuryuzan Russian Federation
RT	Bashkortostan Russian Federation
	Chelyabinsk Russian Federation
SN	City on the Yuryuzan River in W Chelyabinsk Oblast in the Southern Urals. Also a town in Bashkortostan. Before 1993, Yuryuzan Russian Republic was also used. Indexed with oblast or autonomous republic as applicable.

Yvelines France
BT	Europe
	.Western Europe
	..France
	...Yvelines France
NT	Versailles France
SN	Department in N France.

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