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Na
USE	sodium

Na-22
BT	isotopes
	.radioactive isotopes
	..Na-22
BT	metals
	.alkali metals
	..sodium
	...Na-22
SN	This term has multiple hierarchies.

Na-24
BT	isotopes
	.radioactive isotopes
	..Na-24
BT	metals
	.alkali metals
	..sodium
	...Na-24
SN	This term has multiple hierarchies.

Na-montmorillonite
USE	montmorillonite
SN	After 1992, use montmorillonite and sodium ion if applicable.

Nabburg Germany
BT	Europe
	.Central Europe
	..Germany
	...Bavaria Germany
	....Nabburg Germany
SN	Town in E Bavaria, SE Germany.

Nacimiento Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Paleocene
	.....Nacimiento Formation
RT	New Mexico
SN	NW New Mexico. Added to Thesaurus in 1985.

Nacimiento Mountains
BT	United States
	.New Mexico
	..Rio Arriba County New Mexico
	...Nacimiento Mountains
RT	Fenton Hill
	Sur fault zone
SN	Range in NW New Mexico.

Nacogdoches County Texas
BT	United States
	.Texas
	..Nacogdoches County Texas

Nacozari de Garcia Mexico
BT	Mexico
	.Sonora Mexico
	..Nacozari de Garcia Mexico
SN	Town in NE Sonora. Before 1978, also search Nacozari and Mexico.

nacrite
BT	silicates
	.sheet silicates
	..clay minerals
	...nacrite

Naga Hills
BT	Asia
	.Naga Hills
RT	India
	Burma
	Nagaland India
SN	Ranges on India-Burma border, N of Manipur Hills. Indexed with country as applicable. Added to Thesaurus in 1993.

Nagaland India
BT	Asia
	.Indian Peninsula
	..India
	...Northeastern India
	....Nagaland India
RT	Naga Hills
SN	State NE of Bangladesh in NE India. Established in 1961.

Nagano City Japan
BT	nshu
	.Nagano City Japan
RT	Nagano Japan
	Akita Japan
	Koma-ga-take
	Osaka Japan
	Nagano earthquake 1984
SN	City in Nagano Prefecture, central Honshu. Also towns in Akita and Osaka prefectures. Indexed with prefectures as applicable.

Nagano earthquake 1984
BT	earthquakes
	.Nagano earthquake 1984
UF	Nagano Prefecture earthquake 1984
	Naganoken-seibu earthquake 1984
	western Nagano earthquake 1984
RT	Ontake
	Nagano City Japan
	Honshu
	Japan
SN	Epicenter at Nagano, central Honshu. Added to Thesaurus in 1989.

Nagano Japan
BT	nshu
	.Nagano Japan
NT	Lake Suwa
	Matsukawa Japan
	Nojiri Lake
RT	Chubu Japan
	Kiso Mountains
	Ontake
	Akaishi Mountains
	Japanese Alps
	Nagano City Japan
	Asama
	Yake-Dake
	Kanto Mountains
	Ryujima
	Yatsugatake
SN	Prefecture, central Honshu.

Nagano Prefecture earthquake 1984
USE	Nagano earthquake 1984

Naganoken-seibu earthquake 1984
USE	Nagano earthquake 1984

Nagasaki Japan
BT	Asia
	.Far East
	..Japan
	...Kyushu
	....Nagasaki Japan
NT	Goto Islands
	Sasebo Japan
	Unzen
RT	Iki Island
SN	City and prefecture in W Kyushu, S Japan.

Nagorno-Karabakh Azerbaijan
BT	Europe
	.Azerbaijan
	..Nagorno-Karabakh Azerbaijan
RT	Lesser Caucasus
SN	Autonomous Oblast. SW Azerbaijan. Formerly Karabakh Mountain Area. Also search Karabakh. This term has multiple hierarchies.

Nagpur India
BT	Asia
	.Indian Peninsula
	..India
	...Maharashtra India
	....Nagpur India
SN	City, district, and division in NE Maharashtra, W central India.

Naha test well
BT	United States
	.Arizona
	..Naha test well
RT	Navajo Indian Reservation
SN	In Navajo Indian Reservation in NE Arizona.

Nahanni earthquake 1985
BT	earthquakes
	.Nahanni earthquake 1985
RT	Canadian Cordillera
	Northwest Territories
SN	SW Northwest Territories, Canada. Added to Thesaurus in 1993.

Nahanni Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Devonian
	....Middle Devonian
	.....Nahanni Formation
RT	Canada
	British Columbia
	Yukon Territory
	Northwest Territories
SN	British Columbia, Mackenzie District of Northwest Territories, and Yukon Territory.

nahcolite
BT	carbonates
	.nahcolite

Nahe River
BT	Europe
	.Central Europe
	..Germany
	...Nahe River
RT	Rhineland-Palatinate Germany
	Saar-Nahe Basin
	Saarland Germany
SN	River which flows into Rhine at Bingen. Also search Nahe. Indexed with states as applicable.

Naheola Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Paleocene
	.....Naheola Formation
RT	Mississippi
	Alabama
	Midway Group
	Oak Hill Member
SN	In Midway Group. S Alabama and E Mississippi. Added to Thesaurus in 1985.

Naiba River basin
USE	Nayba River basin

Nain Anorthosite Massif
USE	Nain Massif

Nain Complex
USE	Nain Massif

Nain Massif
BT	Canada
	.Eastern Canada
	..Newfoundland
	...Labrador
	....Nain Massif
UF	Nain Anorthosite Massif
	Nain Complex
SN	Anorthosite massif.

Nain Newfoundland
BT	Canada
	.Eastern Canada
	..Newfoundland
	...Labrador
	....Nain Newfoundland
RT	Nain Province
SN	Village on central coast of Labrador.

Nain Province
BT	North America
	.Canadian Shield
	..Nain Province
RT	Quebec
	Labrador
	Nain Newfoundland
SN	Structural province of the Canadian Shield in N Labrador and E Quebec. Indexed with Canadian Shield, and Labrador and/or Quebec as applicable. Added to Thesaurus in 1989.

Naini Tal India
BT	Asia
	.Indian Peninsula
	..India
	...Uttar Pradesh India
	....Naini Tal India
UF	Naini-Tal India
	Nainital India
SN	Town, hill station and district in NE Uttar Pradesh.

Naini-Tal India
USE	Naini Tal India

Nainital India
USE	Naini Tal India

Nairobi Kenya
BT	Africa
	.East Africa
	..Kenya
	...Nairobi Kenya
SN	City in S Kenya.

Naka-no-umi
BT	nshu
	.Naka-no-umi
UF	Nakano umi
	Nakanoumi Lake
RT	Shimane Japan
	Tottori Japan
SN	Inlet of Japan Sea in SW Honshu.

Nakano umi
USE	Naka-no-umi

Nakanoumi Lake
USE	Naka-no-umi

Nakhichevan Azerbaijan
BT	Europe
	.Azerbaijan
	..Nakhichevan Azerbaijan
NT	Ordubad Azerbaijan
SN	Former Autonomous Soviet Socialist Republic and town on the Iranian border separated from Azerbaijan proper by a narrow strip of Armenia. This term has multiple hierarchies.

Nakhla Meteorite
BT	meteorites
	.stony meteorites
	..achondrites
	...Martian meteorites
	....SNC Meteorites
	.....nakhlite
	......Nakhla Meteorite
RT	Egypt
SN	Impact at Abu Hommos, Alexandria, Egypt. Diopside-olivine achondrite. Added to Thesaurus in 1989.

Nakhla Qatar
BT	Asia
	.Arabian Peninsula
	..Qatar
	...Nakhla Qatar
SN	Village in Qatar.

nakhlite
BT	meteorites
	.stony meteorites
	..achondrites
	...Martian meteorites
	....SNC Meteorites
	.....nakhlite
NT	Nakhla Meteorite
SN	Added to Thesaurus in 1981.

Naknek Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Jurassic
	....Upper Jurassic
	.....Naknek Formation
RT	Alaska
SN	S Alaska. Added to Thesaurus in 1989.

Nakuru Basin
BT	Africa
	.East Africa
	..Kenya
	...Nakuru Basin
SN	In Great Rift Valley in Lake Nakuru area of W central Rift Valley Province. Also search Nakuru.

Nama System
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Cambrian
	....Nama System
RT	South Africa
	Namibia
SN	In SW and S Africa.

Namaland
USE	Namaqualand

Namaqualand
BT	Africa
	.Southern Africa
	..Namaqualand
UF	Namaland
RT	Namibia
	Cape Province region
	Northern Cape Province South Africa
SN	Coastal region of sandy plains and bare hills. Indexed with Northern Cape Province South Africa and/or Namibia as applicable.

Namaqualand metamorphic complex
BT	Africa
	.Southern Africa
	..Namaqualand metamorphic complex
RT	South Africa
	Namibia
	Cape Province region
	Northern Cape Province South Africa
SN	Proterozoic. Namibia and Northern Cape Province, South Africa. Indexed with country as applicable. Added to Thesaurus in 1993.

Namib Desert
BT	Africa
	.Southern Africa
	..Namibia
	...Namib Desert
SN	Arid region extending along entire coast.

Namibe Angola
BT	Africa
	.Central Africa
	..Angola
	...Namibe Angola
RT	Mossamedes
SN	Province, formerly Mocamedes, including the city in SW Angola. Also search Mossamedes or Mocamedes.

Namibia
BT	Africa
	.Southern Africa
	..Namibia
NT	Karibib Namibia
	Luderitz Namibia
	Namib Desert
	Otavi Namibia
	Tsumeb Namibia
	Walvis Bay
	Walvis Bay Namibia
	Windhoek Namibia
UF	German Southwest Africa
	South-West Africa
RT	Dwyka Formation
	Karroo Supergroup
	Table Mountain Group
	Zambezi Valley
	Kaapvaal Craton
	Beaufort Group
	Kalahari Desert
	Namaqualand
	Namaqualand metamorphic complex
	Damara Orogeny
	Damara System
	Orange River
	Gibeon Meteorite
	Nama System
	Pongola Supergroup
SN	As of 1981, this term replaces South-West Africa. Added to Thesaurus in 1981.

Namjagbarwa, Mount
USE	Mount Namjagbarwa

Namur Belgium
BT	Europe
	.Western Europe
	..Belgium
	...Namur Belgium
NT	Dinant Basin
	Dinant Belgium
SN	Province in S Belgium.

Namurian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Carboniferous
	....Upper Carboniferous
	.....Namurian
SN	Europe.

Nan Hai
USE	South China Sea

Nan Ling
USE	Nanling

Nan-king
SN	Not a valid term for GeoRef. See Nanjing China.

Nanafalia Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....lower Eocene
	......Nanafalia Formation
RT	Mississippi
	Alabama
	Georgia
	Wilcox Group
SN	In Wilcox Group. S Alabama, SW Georgia and E Mississippi. Added to Thesaurus in 1985.

Nanaimo Group
RT	British Columbia
	Eocene
	K-T boundary
	Paleocene
	Upper Cretaceous
	Washington
SN	Upper Cretaceous to Eocene. NW Washington and SW British Columbia. Indexed with ages as applicable. Added to Thesaurus in 1985.

Nanao Japan
BT	Asia
	.Far East
	..Japan
	...Ishikawa Japan
	....Nanao Japan
RT	Honshu
	Noto Peninsula
SN	City on E side of Noto Peninsula, W coast of Honshu. Indexed with Honshu.

Nance County Nebraska
BT	United States
	.Nebraska
	..Nance County Nebraska

Nandewar Mountains
BT	Australasia
	.Australia
	..New South Wales Australia
	...Nandewar Mountains
SN	Range in NE New South Wales.

Nanga Parbat
BT	Asia
	.Indian Peninsula
	..Jammu and Kashmir
	...Kashmir
	....Nanga Parbat
BT	Asia
	.Himalayas
	..Nanga Parbat
SN	High mountain of W Punjab Himalayas. This term has multiple hierarchies. Indexed with India and/or Pakistan as applicable.

Nanjemoy Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....Nanjemoy Formation
RT	Virginia
	Maryland
SN	Lower and middle Eocene. In Pamunkey Group. Includes Potapaco Clay Member, Woodstock Greensand, Marlboro Clay Member. E Maryland and E Virginia.

Nanjing China
BT	Asia
	.Far East
	..China
	...Jiangsu China
	....Nanjing China
SN	City in Jiangsu, E China.

Nankai Trough
BT	Pacific Ocean
	.North Pacific
	..Northwest Pacific
	...Nankai Trough
RT	Philippine Sea
	DSDP Site 297
	DSDP Site 298
	DSDP Site 582
	Leg 87
	DSDP Site 583
	Nankaido earthquake 1946
SN	Off SE Japan. This term has multiple hierarchies. Added to Thesaurus in 1985.

Nankaido earthquake 1946
BT	earthquakes
	.Nankaido earthquake 1946
RT	Japan
	Pacific Ocean
	Northwest Pacific
	Nankai Trough
SN	Nankai Trough, NW Pacific.

Nanling
BT	Asia
	.Far East
	..China
	...Nanling
UF	Nan Ling
RT	Guangxi China
	Guangdong China
	Hunan China
	Jiangxi China
SN	Mountain system in S central and E China. Separates Guangdong and Guangxi from Hunan and Jiangxi provinces. Indexed with provinces as applicable. Added to Thesaurus in 1989.

Nannoconus
BT	Plantae
	.algae
	..nannofossils
	...Nannoconus
RT	microfossils
SN	Genus. Indexed with microfossils if applicable.

nannofossils
BT	Plantae
	.algae
	..nannofossils
NT	Braarudosphaeridae
	Discoasteridae
	Helicopontosphaera
	Nannoconus
	Sphenolithus
UF	calcareous nannofossils
RT	microfossils
	fossils
	biostratigraphy
	problematic fossils
	Coccolithophoraceae
SN	Treated as a systematic name. Indexed with microfossils if applicable.

nannoplankton
BT	plankton
	.nannoplankton
SN	Added to Thesaurus in 1989.

Nansei-shoto
USE	Ryukyu Islands

Nansen-Gakkel Ridge
USE	Mid-Arctic Ocean Ridge

Nantes France
BT	Europe
	.Western Europe
	..France
	...Loire-Atlantique France
	....Nantes France
SN	City on the Loire River in central Loire-Atlantique, W France.

Nantucket (Island)
USE	Nantucket Island

Nantucket County Massachusetts
BT	United States
	.Massachusetts
	..Nantucket County Massachusetts

Nantucket Island
BT	United States
	.Massachusetts
	..Nantucket Island
UF	Nantucket (Island)
SN	In Atlantic Ocean, S of Cape Cod. Also search Nantucket.

Nantuo Formation
BT	Chronostratigraphic Units
	.Precambrian
	..Proterozoic
	...Sinian
	....Nantuo Formation
RT	China
SN	Added to Thesaurus in 1989.

Nanushuk Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Nanushuk Group
RT	Alaska
SN	N Alaska. Added to Thesaurus in 1985.

NaOH
USE	sodium hydroxide

Napa County California
BT	United States
	.California
	..Napa County California
NT	Calistoga California
RT	San Francisco Bay region
	Old Faithful Geyser
	Homestake Mine
SN	W California.

naphthalene
BT	organic compounds
	.hydrocarbons
	..aromatic hydrocarbons
	...polycyclic aromatic hydrocarbons
	....naphthalene
SN	Added to Thesaurus in 1989.

Napier Complex
BT	Chronostratigraphic Units
	.Precambrian
	..Archean
	...Napier Complex
RT	Antarctica
	Enderby Land
SN	Enderby Land and Tonagh Island, Antarctica. Added to Thesaurus in 1989.

Napierville County Quebec
BT	Canada
	.Eastern Canada
	..Quebec
	...Napierville County Quebec

Naples Italy
BT	Europe
	.Southern Europe
	..Italy
	...Campania Italy
	....Naples Italy
NT	Ischia
UF	Napoli Italy
SN	Province and city on the Tyrrhenian Sea in W Campania, S Italy.

NAPLs
USE	nonaqueous phase liquids

Napoli Italy
USE	Naples Italy

nappe (volcanic)
USE	lava flows

nappes
RT	allochthons
	displacements
	faults
	folds
	gravity sliding
	klippen
	orientation
	overthrust faults
	recumbent folds
	tectonics

Nara Japan
BT	nshu
	.Nara Japan
RT	Kinki Japan
	Kii Peninsula
SN	City and prefecture E of Osaka in W central Honshu.

Narbada River
USE	Narmada River

Narbada Valley
USE	Narmada Valley

Narbonne France
BT	Europe
	.Western Europe
	..France
	...Aude France
	....Narbonne France
SN	City near the Mediterranean Sea in E Aude, S France.

Nares abyssal plain
BT	Atlantic Ocean
	.North Atlantic
	..Nares abyssal plain
SN	NW Atlantic. Added to Thesaurus in 1989.

Nares Strait
BT	Arctic Ocean
	.Nares Strait
RT	Greenland
	Ellesmere Island
	Northwest Territories
	Baffin Bay
SN	Part of the Arctic Ocean, connecting Lincoln Sea to Baffin Bay between E Ellesmere Island, NW Greenland and NW Baffin Bay. Added to Thesaurus in 1989.

Nari Series
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Oligocene
	.....Nari Series
RT	India
	Gujarat India
	Pakistan
	Sind Pakistan
SN	Underlies the Gaj and overlies the Khirthar Series.

Narita Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Neogene
	....Pliocene
	.....Narita Formation
RT	Honshu
	Japan
SN	Tokyo Bay area.

Narizian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....Narizian
RT	upper Eocene
	middle Eocene
SN	North America. Above Ulatisian, below Fresnian.

Narmada River
BT	Asia
	.Indian Peninsula
	..India
	...Narmada River
UF	Narbada River
	Nerbudda River
RT	Gujarat India
	Madhya Pradesh India
	Narmada-Son Lineament
SN	Rises in the Maikala Range in Madhya Pradesh and flows W into Gulf of Cambay. Also search Narmada. Indexed with states as applicable.

Narmada Valley
BT	Asia
	.Indian Peninsula
	..India
	...Narmada Valley
UF	Narbada Valley
	Nerbuda Valley
RT	Gujarat India
	Madhya Pradesh India
	Narmada-Son Lineament
SN	River valley. Indexed with states as applicable.

Narmada-Son Lineament
BT	Asia
	.Indian Peninsula
	..India
	...Narmada-Son Lineament
RT	Gujarat India
	Madhya Pradesh India
	Son Valley
	Narmada River
	Narmada Valley
SN	W and central India. Follows line of Narmada and Son rivers. Indexed with states as applicable. Added to Thesaurus in 1993.

Narnaul India
BT	ryana India
	.Narnaul India
SN	Town 80 miles WSW of Delhi in S Haryana, N central India.

Narpaign Fjord
USE	Narpaing Fjord

Narpaing Fiord
USE	Narpaing Fjord

Narpaing Fjord
BT	Canada
	.Eastern Canada
	..Baffin Island
	...Narpaing Fjord
UF	Narpaign Fjord
	Narpaing Fiord
RT	Davis Strait
SN	Narrow inlet of Davis Strait on Baffin Island. This term has multiple hierarchies.

Narrabeen Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Triassic
	....Narrabeen Group
RT	Australia
	New South Wales Australia
SN	Includes the Gosford Formation and Clifton Sub-Group. N of Sydney.

Narragansett Basin
BT	United States
	.Narragansett Basin
RT	Massachusetts
	Rhode Island
	New England
SN	S New England. Indexed with states as applicable. Added to Thesaurus in 1985.

Narragansett Bay
BT	United States
	.Rhode Island
	..Narragansett Bay
SN	Inlet of Atlantic Ocean in SE Rhode Island.

Narragansett Pier Granite
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...upper Paleozoic
	....Narragansett Pier Granite
RT	Permian
	Pennsylvanian
	New York
	Connecticut
	Rhode Island
SN	E Connecticut, NE New York and S Rhode Island. Indexed with ages as applicable. Added to Thesaurus in 1989.

Narrows
RT	Long Island
	New York City New York
	New York
	North Atlantic
	Staten Island
SN	Strait between W end of Long Island and Staten Island separating Upper New York Bay from Lower New York Bay. Search in combination with New York. Indexed with regions as applicable.

Narugo Japan
BT	nshu
	.Narugo Japan
RT	geothermal fields
SN	Town and geothermal area in N Honshu.

Narvik Norway
BT	Europe
	.Western Europe
	..Scandinavia
	...Norway
	....Nordland Norway
	.....Narvik Norway
SN	City on Ofot Fjord in N Nordland, N Norway.

Narym Russian Federation
BT	Commonwealth of Independent States
	.Russian Federation
	..Tomsk Russian Federation
	...Narym Russian Federation
SN	Village on Ob River in central Tomsk Oblast in W central Siberia. Before 1993, Narym Russian Republic was also used. This term has multiple hierarchies.

Naryn Kyrgyzstan
BT	Asia
	.Kyrgyzstan
	..Naryn Kyrgyzstan
SN	Oblast and town in SE Kyrgyzstan. This term has multiple hierarchies.

NASA
BT	government agencies
	.NASA
UF	National Aeronautics and Space Administration
RT	United States
SN	Acronym. Added to Thesaurus in 1985.

Nasca Plate
USE	Nazca Plate

Nash County North Carolina
BT	United States
	.North Carolina
	..Nash County North Carolina

Nash Fork-Mullen Creek shear zone
USE	Mullen Creek-Nash Fork shear zone

Nashville Dome
BT	United States
	.Nashville Dome
RT	Kentucky
	Alabama
	Tennessee
SN	Indexed with states as applicable. Added to Thesaurus in 1989.

Nashville Tennessee
BT	United States
	.Tennessee
	..Davidson County Tennessee
	...Nashville Tennessee
SN	City on Cumberland River in central Tennessee.

Nasliden Mine
BT	Europe
	.Western Europe
	..Scandinavia
	...Sweden
	....Vasterbotten Sweden
	.....Nasliden Mine
RT	mines
	base metals
	Boliden Sweden
SN	Base metals. NE Vasterbotten, Sweden. Added to Thesaurus in 1985.

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

Nassau County New York
BT	United States
	.New York
	..Nassau County New York
NT	Bay Park New York
RT	Long Island
SN	SE New York.

Nassellaria
USE	Nassellina

Nassellina
BT	Invertebrata
	.Protista
	..Radiolaria
	...Osculosida
	....Nassellina
UF	Nassellaria
RT	microfossils
SN	Suborder. Indexed with microfossils if applicable.

nasturan
USE	pitchblende

Nasu (dake)
USE	Nasudake

Nasu Mountain
USE	Nasudake

Nasudake
BT	nshu
	.Nasudake
UF	Nasu (dake)
	Nasu Mountain
RT	Fukushima Japan
	volcanoes
	Tochigi Japan
SN	Volcanic peak NE of Nikko in N central Honshu. Indexed with prefecture or prefectures as applicable.

nat

Natal South Africa
USE	KwaZulu-Natal South Africa

Natchitoches Parish Louisiana
BT	United States
	.Louisiana
	..Natchitoches Parish Louisiana

Naticidae
BT	Invertebrata
	.Mollusca
	..Gastropoda
	...Naticidae
SN	Family.

national

National Aeronautics and Space Administration
USE	NASA

National Coal Resources Data System
UF	NCRDS
RT	United States
	coal
	data bases
SN	Added to Thesaurus in 1985.

national forests
BT	public lands
	.national forests
RT	land use
	conservation
	Coronado National Forest
	forests
	Teton National Forest

national monuments
BT	public lands
	.national monuments
RT	national parks
	Badlands National Park
	Craters of the Moon
	Marble Canyon
	Death Valley
	Dinosaur National Monument
	White Sands
	wilderness areas
	Glacier Bay National Park
	Katmai National Park
	Pinnacles National Monument
SN	Added to Thesaurus in 1989.

National Oceanic and Atmospheric Administration
USE	NOAA

national parks
BT	public lands
	.national parks
RT	Denali National Park
	conservation
	Arches National Park
	Badlands National Park
	Banff National Park
	Bialowieza
	Big Bend National Park
	Canyonlands National Park
	Grand Canyon
	Fiordland National Park
	Glacier Bay National Park
	Glacier National Park
	Grand Teton
SN	Added to Thesaurus in 1985.

National Petroleum Reserve Alaska
BT	United States
	.Alaska
	..Northern Alaska
	...National Petroleum Reserve Alaska
UF	National Petroleum Reserve in Alaska
	NPRA
RT	North Slope
SN	North Slope, N Alaska.

National Petroleum Reserve in Alaska
USE	National Petroleum Reserve Alaska

national policy
USE	public policy

National Science Foundation
USE	NSF

National Uranium Resource Evaluation Program
USE	NURE

National Water Data Exchange
USE	NAWDEX

National Water Information System-II
USE	NWIS-II

National Water-Quality Assessment Program
USE	NAWQA

native elements
NT	carbonado
	chaoite
	diamond
	graphite
	lonsdaleite
RT	alloys
	antimony
	antimony ores
	arsenic
	arsenic ores
	bismuth
	bismuth ores
	copper
	copper ores
	gold
	gold ores
	iron
	iron ores
	mercury
	mercury ores
	metal ores
	metals
	minerals
	nonmetal deposits
	nonmetals
	silver
	silver ores
	sulfur
	sulfur deposits
SN	Before 1981, search native elements and alloys. As of 1981, minerals that were classified under native elements and alloys are included here or under alloys.

native elements and alloys
SN	As of 1981, no longer a valid term for GeoRef. Use native elements or alloys as applicable.

natrium
USE	sodium

natroalunite
BT	sulfates
	.natroalunite
UF	almeriite
RT	alunitization

natroborocalcite
USE	ulexite

natrolite
BT	silicates
	.framework silicates
	..zeolite group
	...natrolite

Natrona County Wyoming
BT	United States
	.Wyoming
	..Natrona County Wyoming
NT	Casper Wyoming
RT	Rattlesnake Hills
	Casper Mountain
	Gas Hills
	Granite Mountains
	Teapot Dome
SN	Central Wyoming.

natural
SN	A valid index term through 1977.

natural analogs
UF	analogs, natural
	analogues, natural
RT	models
	modern analogs
	homology
	interplanetary comparison
	terrestrial comparison
	systems analogs
SN	Also search natural reactors if applicable. See comparison. Added to Thesaurus in 1995.

natural bridges
USE	natural curiosities

natural coke
USE	coke coal

natural curiosities
UF	natural bridges
RT	bridges
	geomorphology
	erosion features
	popular geology
	solution features
SN	Added to Thesaurus in 1981.

natural dams
BT	dams
	.natural dams
NT	ice dams
RT	geomorphology
	geologic hazards
	mass movements
SN	Also search specific material such as debris flows, landslides, lava. Added to Thesaurus in 1995.

natural gas
BT	petroleum
	.natural gas
NT	coalbed methane
RT	hydrocarbons
	offshore
	Eastern Gas Shales Project
	energy sources
	gas hydrates
	gases
	Karachaganak Field
	clathrates
	degasification
	methane
	gas seeps
	condensates
	gas sands
	giant fields
	hydrogen sulfide
	gas storage
	gas-water interface
	gasification
	oil and gas
SN	Before 1977, also search natural AND gas. See list A for searching category codes. Commodity. See List C.

Natural History Museum of London
USE	British Museum

natural materials
RT	materials
	synthetic materials
SN	Used with minerals only to distinguish from synthetic materials. It is not used for natural materials which are rocks, sediments, isotopes, or commodities. Added to Thesaurus in 1968.

natural recharge
RT	artificial recharge
	ground water
	recharge
SN	Added to Thesaurus in 1982.

natural remanence
USE	natural remanent magnetization

natural remanent magnetism
USE	natural remanent magnetization

natural remanent magnetization
BT	magnetization
	.remanent magnetization
	..natural remanent magnetization
UF	natural remanence
	natural remanent magnetism
	NRM
RT	paleomagnetism
	magnetic field
	characteristic remanent magnetization
	remagnetization

natural resources
RT	conservation
	depletion
	endangered species
	environmental geology
	geologic sites
	land cover maps
	land management
	land use
	public lands
	rain forests
	reclamation
	Resource Conservation and Recovery Act
	resources
	utilization
	wilderness areas

natural selection

Naturaliste Plateau
BT	Indian Ocean
	.Naturaliste Plateau
RT	Leg 28
	Leg 26
	DSDP Site 258
	DSDP Site 264
SN	SE Indian ocean off SW Australia. Added to Thesaurus in 1995.

naturally fractured reservoirs
RT	fractures
	fracturing
	petroleum
	petroleum engineering
	reservoir properties
	reservoir rocks
	reservoirs
SN	Sometimes difficult to determine. Also search (reservoir rocks OR subsurface reservoirs OR reservoirs OR reservoir properties) AND (petroleum OR natural gas OR geothermal energy, as applicable) AND fractures. Added to Thesaurus in 1989.

Naubug
RT	India
	Jammu and Kashmir
	Pakistan
SN	Village SE of Srinager in S Jammu and Kashmir, disputed territory between India and Pakistan. Before 1993, India was a broader term. Indexed with Jammu and Kashmir AND India and/or Pakistan as applicable.

naujaite
BT	igneous rocks
	.plutonic rocks
	..syenites
	...naujaite

Nauru Basin
BT	Pacific Ocean
	.West Pacific
	..Nauru Basin
RT	Equatorial Pacific
	DSDP Site 462
	Leg 61
	Leg 89
	Nauru Island
SN	W Equatorial Pacific Ocean, N and W of Nauru Island. Added to Thesaurus in 1985.

Nauru Island
BT	Oceania
	.Micronesia
	..Nauru Island
UF	Pleasant Island
RT	Nauru Basin
SN	Added to Thesaurus in 1981.

Nautiloidea
BT	Invertebrata
	.Mollusca
	..Cephalopoda
	...Tetrabranchiata
	....Nautiloidea
NT	Aturia
	Hercoglossa danica
	Nautilus
RT	Bactritida

Nautilus
BT	Invertebrata
	.Mollusca
	..Cephalopoda
	...Tetrabranchiata
	....Nautiloidea
	.....Nautilus
SN	Genus.

Navajo

Navajo County Arizona
BT	United States
	.Arizona
	..Navajo County Arizona
NT	Holbrook Arizona
	Hopi Buttes Field
RT	Black Mesa
	Petrified Forest National Park
	Rio Puerco
	Black Mesa Basin
SN	E Arizona.

Navajo Indian Reservation
BT	United States
	.Navajo Indian Reservation
RT	New Mexico
	Utah
	Arizona
	Indian reservations
	Naha test well
SN	NE Arizona, NW New Mexico, and SE Utah. Indexed with states as applicable.

Navajo Sandstone
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Navajo Sandstone
RT	Jurassic
	Upper Triassic
	New Mexico
	Utah
	Colorado
	Arizona
	Glen Canyon Group
	Nugget Sandstone
SN	In Glen Canyon Group. Upper Triassic(?) and Jurassic. N Arizona, W Colorado, NW New Mexico, and SE Utah.

Navarin Basin
BT	Pacific Ocean
	.North Pacific
	..Bering Sea
	...Navarin Basin
BT	Pacific Ocean
	.North Pacific
	..Northeast Pacific
	...Navarin Basin
SN	N Bering Sea. This term has multiple hierarchies. Added to Thesaurus in 1985.

Navarra Spain
BT	Europe
	.Southern Europe
	..Iberian Peninsula
	...Spain
	....Navarra Spain
NT	Asturreta
	Pamplona Spain
RT	Navarre
SN	Former kingdom and now an autonomous community and province in NE Spain. Also search Navarre and Spain.

Navarre
BT	Europe
	.Western Europe
	..Navarre
RT	France
	Spain
	Asturreta
	Navarra Spain
	Pyrenees-Atlantiques France
	Pamplona Spain
SN	Former kingdom and province of N Spain including Navarra Spain and Pyrenees-Atlantiques France. Before 1981, search Navarre AND France. Indexed with Navarra Spain AND/OR Pyrenees-Atlantiques France as applicable.

Navarro County Texas
BT	United States
	.Texas
	..Navarro County Texas

Navarro Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Gulfian
	......Navarro Group
RT	Texas
	Escondido Formation
	Olmos Formation
SN	E Texas. Added to Thesaurus in 1985.

Navesink Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Navesink Formation
RT	Delaware
	New Jersey
	Monmouth Group
SN	In Monmouth Group.

Navicula
BT	Plantae
	.algae
	..diatoms
	...Navicula
RT	microfossils
SN	Indexed with microfossils if applicable.

navigation
RT	Doppler effect
	geophysical methods
	marine methods
	orientation
	remote sensing
	waterways
SN	Indexed with specific methods if applicable.

NAVSTAR GPS
USE	Global Positioning System

NAWDEX
UF	National Water Data Exchange
RT	United States
	ground water
	data processing
	water resources
	hydrology
	data bases
	NAWQA
SN	Acronym. Added to Thesaurus in 1985.

NAWQA
UF	National Water-Quality Assessment Program
RT	United States
	U. S. Geological Survey
	hydrogeology
	water quality
	programs
	NAWDEX
SN	Acronym. U. S. Geological Survey program. Added to Thesaurus in 1995.

Naxos
BT	Mediterranean region
	.Aegean Islands
	..Greek Aegean Islands
	...Cyclades
	....Naxos
SN	Largest island of the Cyclades in the Aegean Sea. This term has multiple hierarchies.

Nayarit Mexico
BT	Mexico
	.Nayarit Mexico
NT	Sanganguey
RT	Guerrero Terrane
	Sierra Madre Occidental
	Mexican volcanic belt
	Jalisco Block
	Rivera Plate
SN	State in W Mexico.

Nayba River basin
BT	Commonwealth of Independent States
	.Russian Federation
	..Nayba River basin
BT	Asia
	.Nayba River basin
UF	Naiba River basin
RT	Sakhalin
SN	S Sakhalin Island. Also search Nayba. This term has multiple hierarchies.

Nazca Plate
UF	Nasca Plate
RT	plate tectonics
	plates
	Pacific Ocean
	Chile Margin Triple Junction
	Galapagos Rift
	DSDP Site 320
	DSDP Site 321
SN	S of the Galapagos Islands. Indexed with geographic area and/or age as applicable.

Nazca Ridge
BT	Pacific Ocean
	.South Pacific
	..Southeast Pacific
	...Nazca Ridge
SN	SW of Peru. This term has multiple hierarchies. Added to Thesaurus in 1981.

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