Er  search
USEerbium
Er Rif  search
USERif
Er Riff  search
USERif
Erath County Texas  search
BTUnited States
 .Texas
 ..Erath County Texas
Eratosthenian  search
RTMoon
SNLunar stratigraphy. Eratosthenian rocks are older than those of the Copernican System but younger than those of the Imbrian System.
erbium  search
BTmetals
 .rare earths
 ..erbium
UFEr
Erduos Basin  search
USEOrdos Basin
Erevan Armenia  search
USEYerevan Armenia
Erfurt Bezirk  search
SNNo longer a valid term for GeoRef. See Thuringia Germany. Used for the district in SW East Germany.
Erfurt Germany  search
BTEurope
 .Central Europe
 ..Germany
 ...Thuringia Germany
 ....Erfurt Germany
SNCity in Thuringia, central Germany. As of 1981, Erfurt refers to only the city in Germany. Before 1981, it also included the East German district.
ergroup#Bluebell Mine#Bluesky Formation#Bonanza Group#Border Ranges Fault#Bowser  search
ergs  search
BTeolian features
 .ergs
RTSahara
 sand
 dunes
 deserts
 sand ridges
 sedimentary structures
 sand seas
 sand sheets
SNAdded to Thesaurus in 1993.
Ericaceae  search
BTPlantae
 .Spermatophyta
 ..Angiospermae
 ...Dicotyledoneae
 ....Ericaceae
SNFamily.
Eridostraca  search
BTInvertebrata
 .Arthropoda
 ..Mandibulata
 ...Crustacea
 ....Ostracoda
 .....Eridostraca
RTmicrofossils
SNIncludes Superfamily Leperditellacea. Indexed with microfossils if applicable.
Erie County New York  search
BTUnited States
 .New York
 ..Erie County New York
SNW New York.
Erie County Ohio  search
BTUnited States
 .Ohio
 ..Erie County Ohio
SNN Ohio.
Erie County Pennsylvania  search
BTUnited States
 .Pennsylvania
 ..Erie County Pennsylvania
NTPresque Isle
SNNW Pennsylvania.
Erimo Seamount  search
BTPacific Ocean
 .North Pacific
 ..Northwest Pacific
 ...Erimo Seamount
RTJapan Trench
 Kuril Trench
SNOff S coast of Hokkaido, Japan. This term has multiple hierarchies.
erionite  search
BTsilicates
 .framework silicates
 ..zeolite group
 ...erionite
Eritrea  search
BTAfrica
 .East Africa
 ..Eritrea
RTEthiopia
 Afar
 Afar Depression
 East African Rift
 Red Sea Basin
 Ethiopian Rift
 Nubian Shield
SNE Africa on the Red Sea. Used in subfile G. Ethiopia was used for this term between 1972 and 1994. Added to Thesaurus in 1995.
Erivan Armenia  search
USEYerevan Armenia
Erlangen Germany  search
BTEurope
 .Central Europe
 ..Germany
 ...Bavaria Germany
 ....Erlangen Germany
SNCity in N central Bavaria.
erodability  search
USEerodibility
erodibility  search
UFerodability
 erosibility
RTerosion
 Universal Soil Loss Equation
SNA measurement of the tendency for or degree of a material to erode.
Eromanga Basin  search
BTAustralasia
 .Australia
 ..Queensland Australia
 ...Eromanga Basin
RTBirkhead Formation
SNIn SW Queensland.
Eros Asteroid  search
BTasteroids
 .S-type asteroids
 ..Eros Asteroid
UF433 Eros
RTNEAR Program
SNObject of NEAR Program study.
erosi  search
erosibility  search
USEerodibility
erosion  search
NTbioerosion
 glacial erosion
 littoral erosion
 planation
 scour
 sheet erosion
 soil erosion
 water erosion
 wind erosion
RTabrasion
 avulsion
 beach profiles
 climatic controls
 corrosion
 CREAMS
 degradation
 denudation
 detritus
 erodibility
 erosion control
 erosion cycle
 erosion features
 erosion rates
 erosion surfaces
 erosional unconformities
 etching
 exfoliation
 exhumation
 fires
 geo
erosion control  search
UFcontrol, erosion
RTwind erosion
 erosion
 soils
 GLEAMS
 conservation
 beach nourishment
 beach profiles
 riprap
 controls
 soil erosion
 water erosion
 geomembranes
 geotextiles
erosion cycle  search
RTcycles
 erosion
 geomorphology
 landform evolution
 peneplains
SNAdded to Thesaurus in 1982.
erosion features  search
NTarroyos
 badlands
 cuestas
 erosion surfaces
 gullies
 inselbergs
 mesas
 pediments
 peneplains
 talus slopes
UFerosion forms
 erosional features
 features, erosion
RTerosion
 plains
 geomorphology
 klippen
 colluvium
 berms
 benches
 terraces
 blowouts
 bluffs
 cliffs
 furrows
 boulders
 natural curiosities
 exhumation
 valleys
 knickpoints
 rills
 scarps
 denudation
 volcanic necks
 dry valleys
 highlands
 inliers
 outliers
 potholes
 tors
 wa
erosion forms  search
USEerosion features
erosion rates  search
RTbioerosion
 erosion
 land loss
 rates
 resurfacing
 sedimentation
 soil erosion
 soils
 sediment transport
SNBefore 1993, also search erosion AND rates. Added to Thesaurus in 1993.
erosion surfaces  search
BTerosion features
 .erosion surfaces
NTpediplains
UFplanation surfaces
 surfaces, erosion
RTerosion
 planation
 geomorphology
 wave-cut platforms
 resurfacing
 peneplains
 pediments
erosion transport  search
SNAs of 1993, not a valid term for GeoRef. See sediment transport.
erosional features  search
USEerosion features
erosional unconformities  search
BTunconformities
 .erosional unconformities
UFdisconformities
RTerosion
 exhumation
SNAdded to Thesaurus in 1982.
erratic blocks  search
USEerratics
erratic boulders  search
USEerratics
erratics  search
BTsediments
 .clastic sediments
 ..erratics
UFerratic blocks
 erratic boulders
RTglacial geology
 glaciers
 glacial features
 boulders
 glacial transport
errors  search
RTaccuracy
 corrections
 maximum likelihood
 precision
 reliability
 uncertainty
SNUsed as a general term.
ERS-1  search
UFERS1
 European Remote Sensing satellite 1
RTremote sensing
 infrared methods
 satellite methods
 radar methods
 microwave methods
SNEuropean Space Agency remote sensing satellite launched 1991. Includes microwave, radar altimetry, and infrared radiometry instrumentation. Also index specific geophysical methods as applicable. Added to Thesaurus in 1998.
ERS1  search
USEERS-1
Ertix River  search
USEIrtysh River
ERTS  search
SNA valid term through 1977. After 1977, use Landsat.
ERTS-1  search
SNA valid term through 1977. After 1977, use Landsat.
erubescite  search
USEbornite
eruption clouds  search
USEash clouds
eruptions  search
RTatmospheric transport
 explosive eruptions
 hawaiian-type eruptions
 lava
 nuees ardentes
 plinian-type eruptions
 pyroclastics
 radon emanometry
 strombolian-type eruptions
 volcanic earthquakes
 volcanic risk
 volcanism
 volcanoes
 volcanology
 vulcanian-type eruptio
eruptive rocks  search
USEvolcanic rocks
Ervine Creek Limestone  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Upper Pennsylvanian
 ......Virgilian
 .......Ervine Creek Limestone
RTIowa
 Missouri
 Nebraska
 Kansas
SNOf Deer Creek Limestone. SW Iowa, NE Kansas, NW Missouri and SE Nebraska.
Erzgebirge  search
BTEurope
 .Central Europe
 ..Erzgebirge
NTCzech Erzgebirge
UFKrusne Hory
 Krusnehory Mountains
 Krusny Hory Mountains
RTSaxony Germany
 Czech Republic
 Bohemia
SNMountain range on the border of Saxony, Germany and Bohemia. Indexed with countries as applicable.
Erzincan earthquake 1992  search
BTearthquakes
 .Erzincan earthquake 1992
RTTurkey
SNEpicenter in Erzincan Province, E central Turkey. Added to Thesaurus in 1998.