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Data sets Publications Expeditions Thesaurus
Sm  search
USEsamarium
Sm-147/Nd-144  search
BTisotopes
 .radioactive isotopes
 ..Sm-147/Nd-144
BTisotopes
 .stable isotopes
 ..Sm-147/Nd-144
BTmetals
 .rare earths
 ..neodymium
 ...Sm-147/Nd-144
BTmetals
 .rare earths
 ..samarium
 ...Sm-147/Nd-144
RTisotope ratios
 Sm/Nd
SNFor age determination, use Sm/Nd. This term has multiple hierarchies.
Sm/Nd  search
UFNd/Sm
RTabsolute age
 isotope ratios
 thermochronology
 neodymium
 samarium
 Sm-147/Nd-144
SNIsotopic ratio used in age determination. Added to Thesaurus in 1985.
Smackover Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Jurassic
 ....Upper Jurassic
 .....Smackover Formation
RTMississippi
 Texas
 Alabama
 Arkansas
SNOverlies Eagle Mills Formation; underlies Buckner Formation. Subsurface.
Smaland  search
BTEurope
 .Western Europe
 ..Scandinavia
 ...Sweden
 ....Smaland
RTKalmar Sweden
SNPlateau region S of Lake Vattern in S Sweden. Indexed with counties as applicable.
small mines  search
BTmines
 .small mines
UFsmall-scale mining
RTmining geology
SNRefers to size of operation. Added to Thesaurus in 1985.
small-scale mining  search
USEsmall mines
smaragd  search
USEemerald
SMART2  search
UFStrong Motion Array Taiwan 2
RTarrays
 seismic networks
 Taiwan
 strong motion
SNAcronym. SMART1 was a surface accelerograph array deployed in 1980 near Lotung, NE Taiwan, which recorded local strong-motion data until 1990. In 1992, SMART2, a larger array situated 70 kilometers south, near Hualien, NE Taiwan was deployed. SMART method
Smartville Complex  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Jurassic
 ....Smartville Complex
RTCalifornia
SNE California. Added to Thesaurus in 1989.
smectite  search
BTsilicates
 .sheet silicates
 ..clay minerals
 ...smectite
RTmontmorillonite
 K-bentonite
 fuller's earth
 saponite
smelters  search
RTeconomic geology
 metallurgy
 mines
 mining geology
 pollution
 production
Smilodon  search
BTChordata
 .Vertebrata
 ..Tetrapoda
 ...Smilodon
RTTheropoda
 Felidae
SNPliocene-Pleistocene genus in North and South America belonging to Family Felidae, Suborder Fissipeda. Also a Triassic genus of Europe belonging to Suborder Theropoda, Order Saurischia. Indexed with fossil names as applicable.
Smirciny Massif  search
USEFichtelgebirge
Smith County Kansas  search
BTUnited States
 .Kansas
 ..Smith County Kansas
SNN Kansas.
Smith County Mississippi  search
BTUnited States
 .Mississippi
 ..Smith County Mississippi
SNS central Mississippi.
Smith County Tennessee  search
BTUnited States
 .Tennessee
 ..Smith County Tennessee
SNN central Tennessee.
Smith County Texas  search
BTUnited States
 .Texas
 ..Smith County Texas
SNE Texas.
Smithers British Columbia  search
BTCanada
 .Western Canada
 ..British Columbia
 ...Smithers British Columbia
SNVillage in W central British Columbia.
Smithian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Triassic
 ....Lower Triassic
 .....Smithian
SNNorth America. Lower Triassic, above Dienerian and below Spathian. Added to Thesaurus in 1985.
Smithsonian Institution  search
RTDistrict of Columbia
 museums
smithsonite  search
BTcarbonates
 .smithsonite
UFzinc spar
RTazurite
Smithville Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Ordovician
 ....Lower Ordovician
 .....Smithville Formation
RTMissouri
 Arkansas
SNAbove Powell Formation and below Black Rock Limestone in N Arkansas, and below Everton Formation in SE Missouri. N Arkansas and SE Missouri.
Smithwick Shale  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Smithwick Shale
RTTexas
SNLower and Middle Pennsylvanian. In Bend Group. Central Texas. Added to Thesaurus in 1985.
Smokies  search
USEGreat Smoky Mountains
Smoky Hill Chalk Member  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Upper Cretaceous
 .....Smoky Hill Chalk Member
RTNew Mexico
 Colorado
 Kansas
 South Dakota
 Niobrara Formation
SNOf Niobrara Formation. E Colorado, W Kansas, NE New Mexico, and SE South Dakota.
Smoky Hill River basin  search
BTUnited States
 .Kansas
 ..Smoky Hill River basin
SNW central and central Kansas. Also search Smoky Hill River. Indexed with counties as applicable.
smoky quartz  search
BTsilicates
 .framework silicates
 ..silica minerals
 ...smoky quartz
RTquartz
Smoky River  search
BTCanada
 .Western Canada
 ..Alberta
 ...Smoky River
SNRises in Jasper National Park and flows NNE into Peace River.
Smolensk Russian Federation  search
BTCommonwealth of Independent States
 .Russian Federation
 ..Smolensk Russian Federation
BTEurope
 .Smolensk Russian Federation
SNOblast including the city on left bank of upper Dnieper River SW of Moscow. Before 1993, Smolensk Russian Republic was also used. This term has multiple hierarchies.
Smyth County Virginia  search
BTUnited States
 .Virginia
 ..Smyth County Virginia
smythite  search
BTsulfides
 .smythite