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He
USE	helium

He-3
BT	isotopes
	.stable isotopes
	..He-3
BT	noble gases
	.helium
	..He-3
RT	He-4/He-3
SN	This term has multiple hierarchies.

He-3/He-4
USE	He-4/He-3

He-4
BT	isotopes
	.stable isotopes
	..He-4
BT	noble gases
	.helium
	..He-4
RT	He-4/He-3
SN	This term has multiple hierarchies.

He-4/He-3
BT	isotopes
	.stable isotopes
	..He-4/He-3
BT	noble gases
	.helium
	..He-4/He-3
UF	He-3/He-4
RT	absolute age
	isotope ratios
	He-3
	He-4
SN	Isotopic ratio. As of 1989, use He/He for age determination method. This term has multiple hierarchies.

He/He
RT	absolute age
	helium
	isotope ratios
	thermochronology
SN	Isotopic ratio used in age determination. Before 1989, also search He-4/He-3. Added to Thesaurus in 1989.

hea

head, hydraulic
USE	hydraulic head

Healdiidae
BT	Invertebrata
	.Arthropoda
	..Mandibulata
	...Crustacea
	....Ostracoda
	.....Podocopida
	......Healdiidae
RT	microfossils
	Cavellinidae
SN	Indexed with microfossils if applicable.

health
USE	medical geology

Heard County Georgia
BT	United States
	.Georgia
	..Heard County Georgia

Heard Plateau
USE	Kerguelen Plateau

Heart Mountain Fault
BT	United States
	.Wyoming
	..Heart Mountain Fault
SN	NW Wyoming.

heat

heat capacity
RT	Kirchhoff integral
	specific heat
	thermal properties

heat conduction
SN	No longer a valid GeoRef index term. Used in subfile N. See heat flow; heat transfer; thermal conductivity.

heat content
USE	enthalpy

heat flo

heat flow
UF	geothermal surveys
	temperature methods
	thermal surveys
RT	geophysical methods
	geophysical surveys
	geophysics
	convection
	Earth
	conductivity
	energy sources
	crust
	Battle Mountain High
	fumaroles
	boreholes
	boundary conditions
	geothermal energy
	geothermal gradient
	core
	heat sources
	Curie point
	heat pumps
	heat flux
	hea
SN	Used for the product of the thermal conductivity of a substance and the thermal gradient in the direction of the flow of heat. Before 1972, also search thermal methods. For surveys, also index the area.

heat flux
RT	heat flow
SN	Heat flow per unit of time.

heat pumps
RT	geothermal energy
	heat flow
	heat transfer
SN	Added to Thesaurus in 1985.

heat sources
UF	sources, heat
RT	mantle
	volcanism
	crust
	heat flow
	geothermal energy
	thermal waters
	core
	regional patterns

heat storage
UF	thermal energy storage
RT	ground water
	aquifers
	energy sources
	geothermal fields
	new energy sources
	geothermal systems
	geothermal energy
	storage
SN	Added to Thesaurus in 1982.

heat transfer
UF	transfer, heat
RT	heat flow
	boiling
	Rayleigh number
	heating
	heat pumps

heat treatment
USE	thermal recovery

heat, specific
USE	specific heat

Heath Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Carboniferous
	....Mississippian
	.....Upper Mississippian
	......Heath Formation
RT	Montana
	North Dakota
	Big Snowy Group
SN	In Big Snowy Group. N central Montana and W North Dakota. Added to Thesaurus in 1989.

heating
RT	cooling
	heat transfer
	temperature
SN	Used as a general term.

heaving, frost
USE	frost heaving

heavy metals
RT	bismuth
	cadmium
	cobalt
	copper
	gold
	iron
	lead
	manganese
	nickel
	platinum
	pollution
	precious metals
	silver
	tantalum
	tellurium
	zinc
SN	Includes use for environmental studies. Indexed with individual metals if possible.

heavy mineral deposits
RT	garnet deposits
	heavy minerals
	kyanite deposits
	monazite deposits
	paleoplacers
	placers
	Prakasam India
	stream placers
	zircon deposits
SN	Commodity. See List C.

heavy minerals
RT	accessory minerals
	apatite
	biotite
	cassiterite
	heavy mineral deposits
	ilmenite
	kyanite
	light minerals
	magnetite
	minerals
	monazite
	nonmagnetic minerals
	placers
	rutile
	sedimentation
	sediments
	titanite
	tourmaline
	zircon
SN	See also individual heavy minerals. As of 1981, use heavy mineral deposits for heavy minerals as a commodity.

heavy oil
RT	condensates
	petroleum

heazlewoodite
BT	sulfides
	.heazlewoodite

HEBBLE
UF	High Energy Benthic Boundary Layer Experiment
RT	sedimentation
	continental rise
	oceanography
	continental slope
	North Atlantic
	Atlantic Ocean
	ocean circulation
	boundary layer
	turbulence
	turbidity currents
	high-energy environment
SN	Acronym. Added to Thesaurus in 1985.

Hebei China
BT	Asia
	.Far East
	..China
	...Hebei China
UF	Hopei China
RT	Tangshan China
	Xingtai earthquake 1966
	Bohai Bay
	Huang He
	Hutuo Group
	Nihewan Formation
	Taihang Mountains
	Tangshan earthquake 1976
	Wumishan Formation
SN	Province in NE China.

Hebgen Lake
BT	United States
	.Montana
	..Gallatin County Montana
	...Hebgen Lake
RT	Hebgen Lake earthquake 1959
SN	W of Yellowstone National Park in Gallatin County.

Hebgen Lake earthquake 1959
BT	earthquakes
	.Hebgen Lake earthquake 1959
RT	Montana
	Gallatin County Montana
	Hebgen Lake
SN	Hebgen Lake, Gallatin County, SW Montana. Also search Hebgen Lake AND earthquakes. Added to Thesaurus in 1989.

Hebridean
USE	Lewisian

Hebrides
BT	Europe
	.Western Europe
	..United Kingdom
	...Great Britain
	....Scotland
	.....Hebrides
UF	Western Islands
RT	Atlantic Ocean Islands
SN	Islands in Atlantic Ocean W of Scotland.

hebronite
USE	amblygonite

Hecla
USE	Hekla

Hecla Hoek Formation
BT	Chronostratigraphic Units
	.Precambrian
	..Hecla Hoek Formation
RT	Arctic region
	Spitsbergen Island
	Spitsbergen
SN	Spitsbergen Island.

Hector Formation
RT	Alberta
	California
	Miocene
	Mojave Desert
	Oligocene
	Precambrian
	Tertiary
SN	Precambrian formation in Alberta and Tertiary formation in the Mojave Desert area, S California. Indexed with ages as applicable.

hectorite
BT	silicates
	.sheet silicates
	..clay minerals
	...hectorite

Hedbergella
BT	Invertebrata
	.Protista
	..Foraminifera
	...Rotaliina
	....Globigerinacea
	.....Hedbergella
RT	microfossils
SN	Genus. Indexed with microfossils if applicable.

hedenbergite
BT	silicates
	.chain silicates
	..pyroxene group
	...clinopyroxene
	....hedenbergite

Hedjaz Meteorite
BT	meteorites
	.stony meteorites
	..chondrites
	...L chondrites
	....Hedjaz Meteorite
RT	Hejaz Saudi Arabia
SN	Impact at Et-Tlahi, Saudi Arabia. Added to Thesaurus in 1989.

hedleyite
BT	tellurides
	.hedleyite
BT	alloys
	.hedleyite
SN	This term has multiple hierarchies.

Heemskirk Granite
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Devonian
	....Heemskirk Granite
RT	Australia
	Tasmania Australia
SN	W Tasmania.

Hegau
BT	Europe
	.Central Europe
	..Germany
	...Baden-Wurttemberg Germany
	....Hegau
SN	Region in SW Germany.

Heidelberg Germany
BT	Europe
	.Central Europe
	..Germany
	...Baden-Wurttemberg Germany
	....Heidelberg Germany
SN	City on Neckar River in NW Baden-Wurttemberg.

Heilongjiang China
BT	Asia
	.Far East
	..China
	...Heilongjiang China
UF	Heilungjiang China
RT	Amur River
	Tancheng-Lujiang fault zone
	Da Hinggan Ling
	Khanka Lake
SN	Province in NE China.

Heilungjiang China
USE	Heilongjiang China

Heimaey
BT	Europe
	.Western Europe
	..Iceland
	...Vestmannaeyjar
	....Heimaey
SN	Island a few miles off S Iceland. Largest of Vestmannaeyjar group.

Heinrich events
RT	debris
	deglaciation
	deposition
	event stratigraphy
	glacial geology
	glacial sedimentation
	glaciomarine sedimentation
	ice rafting
	late-glacial environment
	marine sediments
SN	Record rapid depositional episodes of melting continental ice sheets and resulting icebergs in ice rafted debris of marine sediments. Identified in the Quaternary North Atlantic.

heintzite
USE	kaliborite

Hejaz Saudi Arabia
BT	Asia
	.Arabian Peninsula
	..Saudi Arabia
	...Hejaz Saudi Arabia
RT	Hedjaz Meteorite
SN	Province in W Saudi Arabia.

Hekla
BT	Europe
	.Western Europe
	..Iceland
	...Hekla
UF	Hecla
RT	volcanoes
SN	Volcano in SW Iceland.

Helderberg Group
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Devonian
	....Lower Devonian
	.....Helderberg Group
RT	Virginia
	Pennsylvania
	New York
	Maryland
	West Virginia
	Keyser Limestone
	Coeymans Formation
	Manlius Formation
SN	Includes Coeymans Formation, New Scotland Limestone, Mandata Shale, Becraft Limestone, Port Ewen Shale, Keyser Limestone, Port Jervis Limestone, Licking Creek Limestone, Alsen, Kalkberg, Manlius. New York, E Pennsylvania, W Maryland, Western Virginia, and

Helderbergian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Devonian
	....Lower Devonian
	.....Helderbergian
SN	North America. Above Upper Silurian, below Deerparkian.

Helena Formation
BT	Chronostratigraphic Units
	.Precambrian
	..Proterozoic
	...Mesoproterozoic
	....Helena Formation
UF	Siyeh Formation
RT	Montana
	Belt Supergroup
SN	In Belt Supergroup. W central Montana. Added to Thesaurus in 1989.

Helena Montana
BT	United States
	.Montana
	..Lewis and Clark County Montana
	...Helena Montana
SN	City in W Montana.

Helgoland
BT	hleswig-Holstein Germany
	.Helgoland
RT	North Sea
SN	Island in North Sea 28 miles off mainland.

Helicoplacoidea
BT	Invertebrata
	.Echinodermata
	..Echinozoa
	...Helicoplacoidea

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

helicopter methods
RT	geophysical methods
	geophysical surveys
	methods
	remote sensing
SN	Added to Thesaurus in 1981.

Helikian
BT	Chronostratigraphic Units
	.Precambrian
	..Proterozoic
	...Mesoproterozoic
	....Helikian
RT	Martin Formation
SN	North America.

Heliolites
BT	liolitidae
	.Heliolites
SN	Genus.

Heliolitidae
BT	Invertebrata
	.Coelenterata
	..Anthozoa
	...Zoantharia
	....Tabulata
	.....Heliolitidae
SN	Family.

helium
BT	noble gases
	.helium
NT	He-3
	He-4
	He-4/He-3
UF	He
RT	He/He
	isotopes
	helium gas
	U/He
SN	Chemical element. Use helium gas for helium as a commodity.

helium gas
RT	helium
SN	Commodity. See List C.

Hell Creek Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Cretaceous
	....Upper Cretaceous
	.....Hell Creek Formation
RT	Montana
	North Dakota
	South Dakota
SN	Includes Bull Creek Sand, Isabel-Firesteal Coal Member. E, N, and central S Montana; SW North Dakota; and NW and N South Dakota.

Hell's Canyon
USE	Snake River canyon

Hellenic Arc
BT	Europe
	.Southern Europe
	..Greece
	...Hellenic Arc
RT	Greek Aegean Islands
	Peloponnesus Greece
	Mediterranean Sea
	Crete
	Hellenic Trench
	Rhodes
SN	Island arc from Peloponnesus to Rhodes. Added to Thesaurus in 1985.

Hellenic Trench
BT	Mediterranean Sea
	.Hellenic Trench
RT	East Mediterranean
	Leg 13
	Hellenic Arc
	DSDP Site 127
SN	S of Hellenic Arc. Added to Thesaurus in 1985.

Hellenides
BT	Europe
	.Southern Europe
	..Greece
	...Hellenides
RT	Alps
	Peloponnesus Greece
	Crete
	Pindus Mountains
SN	Deep rooted mountain chain of Greece which is part of the Alpine orogenic belt. Bordered by Rhodope Mountains in N Greece.

Helmholtz free energy
USE	free energy

Helmstedt Germany
BT	Europe
	.Central Europe
	..Germany
	...Lower Saxony Germany
	....Helmstedt Germany
SN	City near Saxony-Anhalt border in E Lower Saxony.

Helsingborg
USE	Halsingborg Sweden

Helsingfors Finland
USE	Helsinki Finland

Helsingor Denmark
BT	Europe
	.Western Europe
	..Scandinavia
	...Denmark
	....Helsingor Denmark
SN	City on the Oresund N of Copenhagen.

Helsinki Finland
BT	Europe
	.Western Europe
	..Scandinavia
	...Finland
	....Southern Finland Province
	.....Helsinki Finland
UF	Helsingfors Finland
SN	Capital city and its surrounding region, S Finland.

Helvetian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Neogene
	....Miocene
	.....middle Miocene
	......Helvetian
RT	Tortonian
SN	Europe.

helvine
USE	helvite

helvite
BT	sulfides
	.helvite
BT	silicates
	.framework silicates
	..helvite
UF	helvine
RT	genthelvite
SN	This term has multiple hierarchies.

hematite
BT	oxides
	.hematite
RT	iron ores
	iron oxides
	ocher
	iron
	iron minerals
	martite
	specularite
SN	Before 1981, included use as a commodity term under iron. As of 1981, may be used as a commodity term with iron ores.

Hemichordata
UF	Stomachorda
RT	Camaroidea
	Graptolithina
	Cephalodiscida
	Pterobranchia
	Chordata
	Dendroidea
	Didymograptina
	Graptoloidea
	Didymograptus
	Diplograptina
	Enteropneusta
	Glossograptina
	Isograptus
	Monograptina
	Monograptus
	Monograptus uniformis
	Rhabdopleurida
	Stolonoidea
	Tuboidea

hemihedrite
BT	chromates
	.hemihedrite

hemimorphite
BT	silicates
	.orthosilicates
	..sorosilicates
	...hemimorphite
RT	zinc ores

Hemingfordian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Neogene
	....Miocene
	.....lower Miocene
	......Hemingfordian
RT	Kirkwood Formation

hemipelagic environment
BT	marine environment
	.hemipelagic environment
RT	sedimentation
	deep-sea environment
	oceanography
	ecology
	paleoecology
	depositional environment
	continental slope
	deep-water environment
	terrigenous materials
	pelagic environment
	slope environment
SN	Added to Thesaurus in 1985.

Hemiptera
BT	Invertebrata
	.Arthropoda
	..Mandibulata
	...Insecta
	....Pterygota
	.....Neoptera
	......Exopterygota
	.......Hemiptera
UF	Hemipteroida
SN	Order. Also search Hemipteroida.

Hemipteroida
USE	Hemiptera

Hemlo Deposit
BT	Canada
	.Eastern Canada
	..Ontario
	...Hemlo Deposit
RT	Canadian Shield
	gold ores
SN	Gold ores. Canadian Shield of Ontario.

Hemlock Conglomerate
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Oligocene
	.....Hemlock Conglomerate
RT	Alaska
	Kenai Group
SN	In Kenai Group. S Alaska. Before 1989, also search Hemlock Formation AND Alaska. Added to Thesaurus in 1989.

Hemlock Formation
BT	Chronostratigraphic Units
	.Precambrian
	..Proterozoic
	...Paleoproterozoic
	....Hemlock Formation
RT	Wisconsin
	Michigan
	Baraga Group
SN	In Baraga Group. Paleoproterozoic. N Michigan and N Wisconsin. Before 1989, was sometimes used for Hemlock Conglomerate in Alaska. Added to Thesaurus in 1989.

Hemphill County Texas
BT	United States
	.Texas
	..Hemphill County Texas

Hemphillian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Neogene
	....Hemphillian
RT	lower Pliocene
	upper Miocene
SN	Upper Miocene to lower Pliocene. Above Clarendonian, below Blancan. Indexed with ages as applicable.

Hempstead County Arkansas
BT	United States
	.Arkansas
	..Hempstead County Arkansas

Henan China
BT	Asia
	.Far East
	..China
	...Henan China
UF	Henan Sheng China
	Honan China
RT	Dabie Mountains
	Taiyuan Formation
	Benxi Formation
	Dongpu Depression
	Huang He
	Luoquan Formation
	Taihua Group
SN	Province, South-Central China.

Henan Sheng China
USE	Henan China

Henbury Meteorite
BT	meteorites
	.iron meteorites
	..octahedrite
	...Henbury Meteorite
RT	Australia
	Northern Territory Australia
SN	Impact in Northern Territory. Before 1981, also search Henbury AND meteorites. Added to Thesaurus in 1981.

Henderson County Illinois
BT	United States
	.Illinois
	..Henderson County Illinois
SN	W Illinois.

Henderson County Kentucky
BT	United States
	.Kentucky
	..Henderson County Kentucky
SN	W Kentucky.

Henderson County North Carolina
BT	United States
	.North Carolina
	..Henderson County North Carolina
SN	W North Carolina.

Henderson County Tennessee
BT	United States
	.Tennessee
	..Henderson County Tennessee
SN	W Tennessee.

Henderson County Texas
BT	United States
	.Texas
	..Henderson County Texas
SN	E Texas.

Henderson Gneiss
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...lower Paleozoic
	....Henderson Gneiss
RT	Cambrian
	Ordovician
	Silurian
	Devonian
	South Carolina
	North Carolina
SN	W North Carolina and NW South Carolina. Indexed with ages as applicable. Added to Thesaurus in 1989.

Henderson Mine
RT	Chibougamau Quebec
	Clear Creek County Colorado
	Colorado
	mines
	molybdenum ores
	Ontario
	polymetallic ores
	Quebec
	talc deposits
SN	Molybdenum ores in Clear Creek County, Colorado. Polymetallic ores in region near Chibougamau, Quebec. Talc deposits near Madoc, Ontario. Indexed with commodity AND (Clear Creek County Colorado or Quebec or Ontario or other location) as applicable. Added

Hendricks County Indiana
BT	Indiana
	.Hendricks County Indiana

Hendry County Florida
BT	United States
	.Florida
	..Hendry County Florida
SN	SW of Lake Okeechobee in S Florida.

Hengchun Peninsula
BT	Asia
	.Far East
	..Taiwan
	...Hengchun Peninsula
SN	Extreme S Taiwan. Added to Thesaurus in 1989.

Hennepin County Minnesota
BT	United States
	.Minnesota
	..Hennepin County Minnesota
SN	E Minnesota.

Hennessey Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Permian
	....Hennessey Formation
RT	Oklahoma
SN	Overlies Wichita Group and underlies Duncan Sandstone, or Flowerpot Shale, where the Duncan is absent. Central and SW Oklahoma.

Henrico County Virginia
BT	United States
	.Virginia
	..Henrico County Virginia
RT	Richmond Virginia
SN	E central Virginia. Also search Richmond Virginia if applicable.

Henry County Alabama
BT	United States
	.Alabama
	..Henry County Alabama
SN	SE Alabama.

Henry County Georgia
BT	United States
	.Georgia
	..Henry County Georgia
SN	N central Georgia.

Henry County Illinois
BT	United States
	.Illinois
	..Henry County Illinois
SN	NW Illinois.

Henry County Indiana
BT	Indiana
	.Henry County Indiana
SN	E Indiana.

Henry County Iowa
BT	United States
	.Iowa
	..Henry County Iowa
SN	SE Iowa.

Henry County Kentucky
BT	United States
	.Kentucky
	..Henry County Kentucky
SN	N Kentucky.

Henry County Missouri
BT	United States
	.Missouri
	..Henry County Missouri
SN	W central Missouri.

Henry County Ohio
BT	United States
	.Ohio
	..Henry County Ohio
SN	NW Ohio.

Henry County Tennessee
BT	United States
	.Tennessee
	..Henry County Tennessee
SN	NW Tennessee.

Henry County Virginia
BT	United States
	.Virginia
	..Henry County Virginia
SN	S Virginia. Also search Martinsville Virginia if applicable.

Henry Mountains
BT	United States
	.Utah
	..Henry Mountains
RT	Garfield County Utah
	Wayne County Utah
SN	Garfield and Wayne counties, S central Utah. Indexed with counties and mountain ranges as applicable.

Henry's law
RT	absorption
	concentration
	equations
	fugacity
	gaseous phase
	gases
	geochemistry
	liquid phase
	partial pressure
	partitioning
	solubility

Henryhouse Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Silurian
	....Henryhouse Formation
RT	Oklahoma
	Hunton Group
SN	S central Oklahoma. Added to Thesaurus in 1989.

Hepaticae
BT	Plantae
	.Bryophyta
	..Hepaticae

Herault France
BT	Europe
	.Western Europe
	..France
	...Herault France
RT	Cevennes
	impact features
SN	Department in S France.

herbicides
BT	pesticides
	.herbicides
NT	alachlor
	bentazon
	metolachlor
	triazines
RT	environmental geology
	agrochemicals
	waste disposal
	pollutants
	pentachlorophenol
SN	Added to Thesaurus in 1993.

herbivores
USE	herbivorous taxa

herbivorous taxa
UF	herbivores
RT	ecology
	paleoecology
	ecosystems
	carnivorous taxa
	feeding
	grasslands
SN	Added to Thesaurus in 1993.

Hercegovina
USE	Herzegovina

Hercinico Centro
BT	Europe
	.Southern Europe
	..Iberian Peninsula
	...Spain
	....Hercinico Centro
SN	Added to Thesaurus in 1981.

Hercinico Sur
BT	Europe
	.Southern Europe
	..Iberian Peninsula
	...Spain
	....Hercinico Sur
SN	Added to Thesaurus in 1981.

Hercoglossa danica
BT	Invertebrata
	.Mollusca
	..Cephalopoda
	...Tetrabranchiata
	....Nautiloidea
	.....Hercoglossa danica

Hercynian
SN	A valid index term through 1977. After 1977, use Hercynian Orogeny.

Hercynian Geosyncline
RT	geosynclines
	Hercynian Orogeny
SN	Before 1978, search geosynclines AND Hercynian.

Hercynian Orogeny
UF	Abean Orogeny
	Variscan Orogeny
RT	Lower Triassic
	Devonian
	Carboniferous
	Permian
	orogeny
	tectonics
	Europe
	Asturian Orogeny
	Rhenohercynian
	Hercynian Geosyncline
	Saalian Phase
	Saxothuringian
	Variscides
SN	Devonian-Lower Triassic. Also search orogeny AND Hercynian; Variscan; Abean. Indexed with ages as applicable.

Hercynides
USE	Variscides

hercynite
BT	oxides
	.hercynite
UF	ferrospinel
	iron spinel
RT	spinel group

herderite
BT	phosphates
	.herderite

Herja
BT	Europe
	.Southern Europe
	..Romania
	...Transylvania
	....Maramures Romania
	.....Herja
SN	Mining region in Maramures County in N Transylvania.

Herkimer County New York
BT	United States
	.New York
	..Herkimer County New York
SN	Central and N central New York.

hermatypic taxa
UF	taxa, hermatypic
RT	ahermatypic taxa
	Coelenterata
	reef builders
	reefs
SN	Before 1978, also search hermatypic.

Hermosa Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Carboniferous
	....Pennsylvanian
	.....Middle Pennsylvanian
	......Hermosa Formation
RT	New Mexico
	Utah
	Colorado
	Arizona
	Honaker Trail Formation
	Paradox Member
SN	Middle Pennsylvanian of Arizona, Colorado, New Mexico and Utah. Added to Thesaurus in 1985.

Hernando County Florida
BT	United States
	.Florida
	..Hernando County Florida

Heron Island
RT	Queensland Australia
SN	Largest of Capricorn Islands in Coral Sea 40 miles off SE coast. Indexed with state or region as applicable.

Herrin Coal Member
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Carboniferous
	....Pennsylvanian
	.....Herrin Coal Member
UF	Herrin No. 6 Coal
RT	Illinois
	Carbondale Formation
SN	Of Carbondale Formation. Added to Thesaurus in 1985.

Herrin No. 6 Coal
USE	Herrin Coal Member

Hertford County North Carolina
BT	United States
	.North Carolina
	..Hertford County North Carolina

Hertfordshire England
BT	Europe
	.Western Europe
	..United Kingdom
	...Great Britain
	....England
	.....Hertfordshire England
SN	SE England.

hervidero
USE	mud volcanoes

Herzegovina
BT	snia-Herzegovina
	.Herzegovina
UF	Hercegovina
SN	Region in N Bosnia-Herzegovina.

herzenbergite
BT	sulfides
	.herzenbergite
UF	kolbeckine

Hesperian
RT	Mars
SN	Intermediate system of three in the Martian stratigraphic column. Added to Thesaurus in 1993.

Hess Deep
BT	Pacific Ocean
	.North Pacific
	..Northeast Pacific
	...Hess Deep
BT	Pacific Ocean
	.Equatorial Pacific
	..Hess Deep
RT	Galapagos Rift
	East Pacific Rise
	Leg 147
	ODP Site 894
	ODP Site 895
SN	5400 meter-deep rift valley near the triple junction of the Pacific-Cocos-Nazca Ridge, E Equatorial Pacific. This term has multiple hierarchies.

Hess Mountains
BT	Canada
	.Western Canada
	..Yukon Territory
	...Hess Mountains
SN	E central Yukon Territory.

Hess Rise
BT	Pacific Ocean
	.North Pacific
	..Northwest Pacific
	...Hess Rise
RT	DSDP Site 310
	Leg 62
	DSDP Site 464
	DSDP Site 465
	DSDP Site 466
SN	N central Pacific Ocean. This term has multiple hierarchies. Added to Thesaurus in 1985.

Hesse
BT	Europe
	.Central Europe
	..Germany
	...Hesse
RT	Hesse Germany
SN	Region in central Germany, comprising the state of Hesse and the former Prussian province of Hesse-Nassau. As of 1993, use Hesse Germany for the state.

Hesse Basin
BT	Europe
	.Central Europe
	..Germany
	...Hesse Basin
SN	Between Kassel and Wetterau. Added to Thesaurus in 1981.

Hesse Germany
BT	Europe
	.Central Europe
	..Germany
	...Hesse Germany
NT	Taunus
RT	Rhenish Schiefergebirge
	Franconia
	Main River
	Odenwald
	Palatinate
	Swabia
	Upper Rhine Valley
	Rhon Mountains
	Frankfurt Germany
	Frankenberg Germany
	Hesse
	Lahn River
	Lahn River valley
	Mainz Basin
	Southwestern German Massifs
	Steinheim Germany
	Werra River
	Weser
SN	State.

Hessen
SN	Not a valid term for GeoRef. See Hesse Germany or Hesse.

hessite
BT	tellurides
	.hessite

heterochrony
USE	diachronism

Heterocorallia
BT	Invertebrata
	.Coelenterata
	..Anthozoa
	...Zoantharia
	....Heterocorallia
SN	Order.

heterogeneity
UF	inhomogeneity
RT	seismology
	self-similarity
	homogeneity
SN	Added to Thesaurus in 1981.

heterogeneous materials
RT	homogeneous materials
	materials
SN	Before 1978, search heterogeneous.

heterogenite
BT	oxides
	.heterogenite
UF	stainierite

Heterohelicidae
BT	Invertebrata
	.Protista
	..Foraminifera
	...Rotaliina
	....Globigerinacea
	.....Heterohelicidae
RT	microfossils
SN	Family. Indexed with microfossils if applicable.

heteromorphic taxa
UF	heteromorphs
	taxa, heteromorphic
RT	taxonomy

heteromorphite
BT	sulfosalts
	.sulfantimonites
	..heteromorphite

heteromorphs
USE	heteromorphic taxa

Heteroptera
BT	miptera
	.Heteroptera
SN	Suborder.

Heterostegina
BT	Invertebrata
	.Protista
	..Foraminifera
	...Rotaliina
	....Rotaliacea
	.....Heterostegina
RT	microfossils
	Nummulitidae
SN	Indexed with microfossils if applicable.

Heterostegina depressa
BT	terostegina
	.Heterostegina depressa
RT	microfossils
SN	Indexed with microfossils if applicable.

Heterostraci
BT	Chordata
	.Vertebrata
	..Agnatha
	...Heterostraci
RT	Pisces
SN	Order.

Hettangian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Jurassic
	....Lower Jurassic
	.....Hettangian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Jurassic
	....Lower Jurassic
	.....lower Liassic
	......Hettangian
SN	Europe. Above Rhaetian (Triassic), below Sinemurian.

Hettinger County North Dakota
BT	United States
	.North Dakota
	..Hettinger County North Dakota

heulandite
BT	silicates
	.framework silicates
	..zeolite group
	...heulandite
RT	clinoptilolite

hexachlorobenzene
BT	organic compounds
	.halogenated hydrocarbons
	..chlorinated hydrocarbons
	...hexachlorobenzene
UF	perchlorobenzene
RT	agrochemicals
	chlorobenzene
	pollutants
	toxic materials
	aromatic hydrocarbons
	benzene
SN	Used in organic synthesis, as a seed fungicide and wood preservative.

Hexacorallia
USE	Scleractinia

Hexactinellida
BT	Invertebrata
	.Porifera
	..Hexactinellida
SN	Class. Before 1998, also search Hyalospongea.

Hexactiniaria
BT	Invertebrata
	.Coelenterata
	..Anthozoa
	...Zoantharia
	....Hexactiniaria

hexagonal system
BT	crystal systems
	.hexagonal system
RT	crystallography
SN	Before 1985, also search hexagonal. Added to Thesaurus in 1985.

hexahedrite
BT	meteorites
	.iron meteorites
	..hexahedrite
UF	hexahedrites
SN	Added to Thesaurus in 1981.

hexahedrites
USE	hexahedrite

hexahydrite
BT	sulfates
	.hexahydrite

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