Black  search
Black Creek Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Upper Cretaceous
 .....Black Creek Formation
RTSouth Carolina
 North Carolina
SNE South Carolina and W North Carolina. Added to Thesaurus in 1989.
Black earth  search
USEChernozems
Black Forest  search
BTEurope
 .Central Europe
 ..Black Forest
UFSchwarzwald
RTSwitzerland
 Baden-Wurttemberg Germany
SNMountainous region in W Baden-Wurttemberg extending into NW Switzerland. Indexed with country and state or canton as applicable.
Black Hawk County Iowa  search
BTUnited States
 .Iowa
 ..Black Hawk County Iowa
Black Hills  search
RTCrook County Wyoming
 Custer County South Dakota
 Fall River County South Dakota
 Lawrence County South Dakota
 Meade County South Dakota
 Niobrara County Wyoming
 Pennington County South Dakota
 South Dakota
 United States
 Weston County Wyoming
 Wyoming
SNGroup of mountains primarily in SW South Dakota. May be in other locations. Search in combination with state or region. Indexed with states and counties as applicable.
black lead  search
USEgraphite
Black Mesa  search
RTApache County Arizona
 Arizona
 Coconino County Arizona
 Navajo County Arizona
SNTableland region in NE Arizona. Also occurs in other locations. Search in combination with state or region. Indexed with counties or regions as applicable.
Black Mesa Basin  search
RTArizona
 Coconino County Arizona
 Navajo County Arizona
SNIn NE Arizona. Search in combination with state or region. Indexed with counties or regions as applicable.
Black Mountain  search
RTArizona
 Australia
 California
 South Africa
 Wales
SNOccurs in various locations. Indexed with appropriate regions or states and U.S. counties as applicable. Added to Thesaurus in 1989.
Black Mountains  search
RTArizona
 Beaver County Utah
 Black Range
 California
 Clark County Nevada
 England
 Inyo County California
 Iron County Utah
 Mohave County Arizona
 Nevada
 Utah
 Wales
SNOccur in numerous locations including: part of the Amargosa Range, Death Valley area, E California and S Nevada; Mohave County, NW Arizona and Clark County, S Nevada; Beaver and Iron counties, SW Utah; and in SE Wales and SW England. Indexed with states a
Black Range  search
RTBlack Mountains
 Grant County New Mexico
 New Mexico
 Sierra County New Mexico
SNExtends N-S through parts of Grant and Sierra counties in SW New Mexico. Indexed with counties or state and mountain ranges as applicable.
Black River Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Ordovician
 ....Middle Ordovician
 .....Black River Group
RTPennsylvania
 New York
 Blackriverian
SNComprises Pamelia, Lowville, and Chaumont formations.
Black River-Matheson Program  search
USEBRIM
Black Rock  search
RTBahamas
 Black Rock Desert
 North Atlantic
 Utah
SNW central Utah. Also search Black Rock Desert and Utah for location in Utah. As of 1993, use Black Rock Utah for the town if applicable. Also a marine feature in the Bahamas. Indexed with states or regions as applicable. Added to Thesaurus in 1981.
Black Rock Desert  search
RTBlack Rock
 Humboldt County Nevada
 Millard County Utah
 Nevada
 Pershing County Nevada
SNIn Pershing and Humboldt counties in NW Nevada. Also a location in Millard County Utah. Search in combination with state or region. Indexed with counties or states as applicable.
Black Sea  search
BTMediterranean Sea
 .East Mediterranean
 ..Black Sea
RTAzov Sea
 Bosporus
 DSDP Site 379
 DSDP Site 380
 DSDP Site 381
 Eurasia
 Leg 42B
SNLarge inland sea bounded on the N and NE by the Central Asian republics, the Russian Federation, and Ukraine; S by Turkey, and W by Bulgaria and Romania.
Black Sea Basin  search
USEBlack Sea region
Black Sea Coast  search
USEBlack Sea region
Black Sea Lowland  search
USEBlack Sea region
Black Sea region  search
UFBlack Sea Basin
 Black Sea Coast
 Black Sea Lowland
RTTurkey
 Romania
 Ukraine
 Bulgaria
 Eurasia
 Cimmerian Orogeny
 Dobruja Basin
 Moldova
SNIndexed with Europe and/or Asia; and/or countries as applicable.
black shale  search
BTsedimentary rocks
 .clastic rocks
 ..black shale
UFbiopelite
 bituminous shale
 carbonaceous shale
RTterrigenous materials
 shale
 carbonaceous composition
black smokers  search
BThydrothermal vents
 .black smokers
RTbottom features
 ocean floors
 sulfides
 mid-ocean ridges
 hydrothermal conditions
 fumaroles
 volcanic features
SNAdded to Thesaurus in 1993.
Black Warrior Basin  search
BTUnited States
 .Black Warrior Basin
RTMississippi
 Alabama
 Mary Lee Coal
 Warrior coal field
SNPrimarily in Alabama. Indexed with states as applicable.
Blackbird District  search
USEBlackbird mining district
Blackbird mining district  search
BTUnited States
 .Idaho
 ..Lemhi County Idaho
 ...Blackbird mining district
UFBlackbird District
RTmines
 copper ores
 cobalt ores
SNE central Idaho. Added to Thesaurus in 1993.
Blackford County Indiana  search
BTIndiana
 .Blackford County Indiana
SNE Indiana.
Blackhawk Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Upper Cretaceous
 .....Blackhawk Formation
RTUtah
 Mesaverde Group
SNIn Mesaverde Group. Six principal members are Desert, Grassy, Sunnyside, Kenilworth, Aberdeen, and Spring Canyon. Central E Utah.
Blackleaf Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Lower Cretaceous
 .....Blackleaf Formation
RTMontana
 Colorado Group
 Sweetgrass Arch
SNLower Cretaceous. NW and central Montana. In Colorado Group. Members ascending are Flood Member, Taft Hill Member, Vaughn Member, and Bootlegger Member. Underlies Marias River Shale; overlies Kootenay Formation. Added to Thesaurus in 1993.
Blackriverian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Ordovician
 ....Middle Ordovician
 .....Blackriverian
RTBlack River Group
SNNorth America. Lower Mohawkian, below Trentonian.
Blacksburg Virginia  search
BTUnited States
 .Virginia
 ..Montgomery County Virginia
 ...Blacksburg Virginia
SNTown in SW Virginia.
Blackstone Series  search
BTChronostratigraphic Units
 .Precambrian
 ..Proterozoic
 ...Neoproterozoic
 ....Blackstone Series
RTMassachusetts
 Rhode Island
SNSE Massachusetts and N Rhode Island. Added to Thesaurus in 1989.
Blackwater Draw Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Quaternary
 ....Blackwater Draw Formation
RTPleistocene
 Holocene
 New Mexico
 Texas
SNPleistocene or Holocene. In Texas and New Mexico. Indexed with age as applicable. Added to Thesaurus in 1995.
Blackwater River  search
RTFlorida
 Missouri
 West Virginia
SNSeveral locations including NW Florida and W Missouri. Indexed with county or region as applicable.