Ground-Water Information Center Montana Bureau of Mines and Geology Montana Tech of The University of Montana 1300 West Park Street - Main Hall 314 Butte Montana 59701-8997	9/8/2008
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Listed below are the currently available Geologic Aquifer Codes in GWIC.

Code	Description
100UDFD	CENOZOIC UNDIFFERENTIATED
110ADKB	ANDERSON-DIETZ1 CLINKER
110ALVF	ALLUVIAL FAN DEPOSITS (QUATERNARY)
110ALVM	ALLUVIUM (QUATERNARY)
110ANKB	ANDERSON CLINKER
110CDKB	C&D CLINKER
110CKKB	COOK CLINKER
110CLNK	QUATERNARY CLINKER DEPOSITS
110CLVM	COLLUVIUM (QUATERNARY)
110CNKB	CANYON CLINKER
110DIKB	DIETZ CLINKER
110FRKB	FERRY CLINKER
110LCSR	LACUSTRINE DEPOSITS (QUATERNARY)
110ODKB	ODELL CLINKER
110PDMN	PEDIMENT DEPOSITS (QUATERNARY)
110PWKB	PAWNEE CLINKER
110SNGR	SAND AND GRAVEL (QUATERNARY)
110SWKB	SAWYER CLINKER
110TRRC	TERRACE DEPOSITS (QUATERNARY)
110UDFD	QUATERNARY UNDIFFERENTIATED
110VLCC	VOLCANICS (QUATERNARY)
110WAKB	WALL CLINKER
110YRT1	YELLOWSTONE RIVER TERRACE-1
111ALVF	ALLUVIAL FAN DEPOSITS (HOLOCENE)
111ALVM	ALLUVIUM (HOLOCENE)
111CLVM	COLLUVIUM (HOLOCENE)
111DDGP	DREDGE PILINGS (PLACER TAILINGS)
111DMCT	HOLOCENE SILT AND CLAY
111FILL	HOLOCENE MAN-DEPOSITED FILL MATERIALS
111LCSR	LACUSTRINE DEPOSITS (HOLOCENE)
111MDMP	MINE DUMPS
111MTLG	MINE TAILINGS
111PDMN	PEDIMENT DEPOSITS (HOLOCENE)
111SICL	HOLOCENE SILT AND CLAY
111SNGR	SAND AND GRAVEL (HOLOCENE)
111SPBK	COAL MINE SPOIL BANKS
111TGPD	TAILING PONDS
111TRRC	TERRACE DEPOSITS (HOLOCENE)
111UDFD	HOLOCENE UNDIFFERENTIATED
111VLCC	VOLCANICS (HOLOCENE)
111WAST	METAL MINE WASTE ROCK
111WDBL	WIND BLOWN DEPOSITS (HOLOCENE)
112ALMN	ALTAMONT MORAINE
112ALVF	ALLUVIAL FAN DEPOSITS - PLEISTOCENE
112ALVM	ALLUVIUM (PLEISTOCENE)
112CNCK	CRANE CREEK GRAVEL
112CRRC	CARTWRIGHT GRAVEL (PLEISTOCENE)
112DMCT	PLEISTOCENE DIAMICT: DEBRIS FLOW GLACIAL OR OTHER
112DRFT	GLACIAL DRIFT
112GFLK	GLACIAL GREAT FALLS LAKE SEDIMENTS
112GLCC	GLACIOLACUSTRINE DEPOSITS (PLEISTOCENE)
112LCSR	LACUSTRINE DEPOSITS (PLEISTOCENE)
112LKML	GLACIAL LAKE MISSOULA BEDS
112LONE	LONEPINE AQUIFER (LITTLE BITTERROOT VALLEY)
112OTSH	GLACIAL OUTWASH (PLEISTOCENE)
112SDMS	SEDIMENTS (PLEISTOCENE)
112SICL	PLEISTOCENE SILT AND CLAY
112SNGR	SAND AND GRAVEL (PLEISTOCENE)
112TILL	GLACIAL TILL
112TRRC	TERRACE DEPOSITS (PLEISTOCENE)
112UDFD	PLEISTOCENE UNDIFFERENTIATED
112VFAL	PLEISTOCENE VALLEY-FILL ALLUVIUM CLEAN SAND&GRAV
112VLCC	VOLCANICS (PLEISTOCENE)
112WDBL	WIND-BLOWN DEPOSITS (PLEISTOCENE)
112WIOT	WIOTA GRAVELS (PLEISTOCENE)
112YRT2	YELLOWSTONE RIVER TERRACE-2
112YRT3	YELLOWSTONE RIVER TERRACE-3
112YRT4	YELLOWSTONE RIVER TERRACE-4
120BLMN	BELMONT PORPHRY
120BRKR	BARKER PORPHYRY
120BZMN	BOZEMAN GROUP
120CPCK	CARPENTER CREEK GRANITE PORPHYRY
120DMCT	TERTIARY DIAMICT: DEBRIS FLOW GLACIAL OR OTHER
120DMLM	DRUMLUMMON PORPHYRY
120FWLS	FRESH WATER LIMESTONE OF PLIOCENE AND MIOCENE AGE WITHIN TUFFACEOUS DEPOSITS
120LCSR	LACUSTRINE DEPOSITS (TERTIARY)
120LNLY	LINLEY CONGLOMERATE
120PLNC	PLUTONIC ROCKS (TERTIARY - CRETACEOUS)
120PNTO	PINTO DIORITE
120SCRK	SNOW CREEK QUARTZ PORPHYRY
120SDMS	SEDIMENTS (TERTIARY)
120SFRD	STANFORD CONGLOMERATE
120SICL	TERTIARY SILT AND CLAY
120SNGR	SAND AND GRAVEL (TERTIARY)
120TRRC	TERRACE DEPOSITS (TERTIARY)
120UDFD	TERTIARY UNDIFFERENTIATED
120VLCC	VOLCANICS (TERTIARY)
120WOLF	WOLF PORPHYRY
121BLCK	BLACK TAIL DEER CREEK FORMATION
121CSTL	CASTLE GRANITE (PLIOCENE)
121FLXV	FLAXVILLE GRAVELS (PLIOCENE-MIOCENE)
121FREL	FORT ELLIS BEDS (PLIOCENE)
121LCSR	LACUSTRINE DEPOSITS (PLIOCENE)
121PLNC	PLUTONIC ROCKS (PLIOCENE)
121SDMS	SEDIMENTS (PLIOCENE)
121SXCK	SIXMILE CREEK FORMATION (PLIOCENE)
121UDFD	PLIOCENE UNDIFFERENTIATED
121VLCC	VOLCANIC ROCKS (PLIOCENE)
122ARKR	ARIKAREE FORMATION (MIOCENE)
122CHLS	CHALLIS VOLCANICS (MIOCENE-OLIGOCENE-EOCENE)
122CLLS	CHALLIS VOLCANICS-EOCENE
122DPRV	DEEP RIVER BEDS (MIDDLE MIOCENE)
122FRLG	FORT LOGAN BEDS (LOWER MIOCENE)
122LCSR	LACUSTRINE DEPOSITS (MIOCENE)
122MDSV	MADISON VALLEY FORMATION
122PLNC	PLUTONIC ROCKS (MIOCENE)
122RMRD	RIMROAD GRAVEL OR FORMATION
122SDMS	SEDIMENTS (MIOCENE)
122UDFD	MIOCENE UNDIFFERENTIATED
122VLCC	VOLCANIC ROCKS (MIOCENE)
122WDMN	WOOD MOUNTAIN GRAVELS (SASKATCHEWAN)
123ABRD	ANCESTRAL BITTERROOT RIVER DEPOSITS
123CBGA	CLIMBING ARROW FORMATION (OF BOZEMAN GROUP)
123CHLS	CHALLIS VOLCANICS (OLIGOCENE)
123CKRC	COOK RANCH FORMATION
123CPHL	CYPRESS HILLS FORMATION (SASKATCHEWAN)
123DBCK	DUNBAR CREEK FORMATION (OF BOZEMAN GROUP)
123LCSR	LACUSTRINE DEPOSITS (OLIGOCENE)
123PLNC	PLUTONIC ROCKS (OLIGOCENE)
123PPSP	PIPESTONE SPRINGS FORMATION
123SDMS	SEDIMENTS (OLIGOCENE)
123UDFD	OLIGOCENE UNDIFFERENTIATED
123VLCC	VOLCANIC ROCKS (OLIGOCENE)
123WRVR	WHITE RIVER FORMATION OR GROUP-SOUTH DAKOTA
124BVRD	BEAVERHEAD FORMATION (EOCENE - PALEOCENE)
124CRDL	CRANDALL CONGLOMERATE-WYOMING
124GLDV	GOLDEN VALLEY FORMATION-NORTH DAKOTA
124GVSB	GOLDEN VALLEY FORMATION (OLIGOCENE-PALEOCENE)
124KGBG	KINGSBURY CONGLOMERATE MEMBER (OF WASATCH FM)
124KSNN	KISHENEHN FORMATION
124LDCK	LOWLAND CREEK VOLCANICS
124LVGS	LIVINGSTON FORMATION (EOCENE -CRETACEOUS)
124PLNC	PLUTONIC ROCKS (EOCENE)
124REES	REESE FORMATION-EOCENE
124SDMS	SEDIMENTS (EOCENE)
124SGCK	SAGE CREEK FORMATION
124SPNX	SPHINX CONGLOMERATE
124UDFD	EOCENE UNDIFFERENTIATED
124VLCC	VOLCANICS (EOCENE)
124WSTC	WASATCH FORMATION
125ADCB	ANDERSON-DIETZ 1 COALS COMBINED - FT UNION FM
125ADIB	ANDERSON-DIETZ INTERBURDEN - FT UNION FM
125ADKB	ANDERSON-DIETZ1 CLINKER - FT UNION FM
125ADKC	ANDERSON-DIETZ1 CLINKER AND COAL - FT UNION FM
125ADOB	ANDERSON-DIETZ 1 AND 2 OVERBURDEN - FT UNION FM
125ADUB	ANDERSON-DIETZ COAL UNDERBURDEN
125ANCB	ANDERSON COAL OF THE FT UNION FORMATION
125AND2	ANDERSON-DIETZ 1 AND 2 COALS - FT UNION FM
125ANUB	ANDERSON COAL UNDERBURDEN
125BACB	BREWSTER-ARNOLD COAL - FT UNION FM
125BAUB	BREWSTER-ARNOLD COAL UNDERBURDEN
125BEAR	BEAR FORMATION
125CDCB	C&D COAL
125CDUB	C&D COAL UNDERBURDEN
125CKCB	COOK COAL - FT UNION FM
125CKUB	COOK COAL UNDERBURDEN
125CNCB	CANYON COAL OF THE FT UNION FORMATION
125CNOB	CANYON COAL OVERBURDEN - FT UNION FORMATION
125CNUB	SUB-CANYON COAL SANDSTONE - FT UNION FM
125CRCB	CARNEY COAL BED
125D12K	DIETZ 1 AND 2 CLINKER AND COAL - FT UNION FM
125D1CB	DIETZ 1 COAL OF THE FT UNION FORMATION
125D1D2	DIETZ 1 AND 2 COALS COMBINED - FT UNION FM
125D23I	DIETZ 2 - 3 INTERBURDEN - FT UNION FM
125D2CB	DIETZ 2 COAL OF THE FT UNION FORMATION
125D3CB	DIETZ 3 COAL OF THE FT UNION FORMATION
125DICB	DIETZ COAL OF THE FT UNION FORMATION
125DIUB	DIETZ COAL UNDERBURDEN
125ELCB	ELK COAL
125ELUB	ELK COAL UNDERBURDEN
125FGCB	FLOWERS-GOODALE COAL - FT UNION FM
125FGOB	FLOWERS-GOODALE COAL OVERBURDEN - FT UNION FM
125FGUB	FLOWERS-GOODALE COAL UNDERBURDEN - FT UNION FM
125FRCB	FERRY COAL
125FRUB	FERRY COAL UNDERBURDEN
125FRUN	FORT UNION FORMATION
125HRMN	HARMON LIGNITE OF THE TONGUE RIVER MEMBER
125KNCB	KNOBLOCK COAL OF THE FT UNION FORMATION
125KNOB	KNOBLOCK COAL OVERBURDEN SS - FT UNION FM
125KNUB	KNOBLOCH COAL UNDERBURDEN - FT UNION FM
125LDLW	LUDLOW MEMBER (OF FT UNION FM.)
125LEBO	LEBO SHALE MEMBER (OF FT UNION FM.)
125LKCB	LOWER KNOBLOCH COAL OF THE FORT UNION FORMATION
125LNLY	LINLEY CONGLOMERATE (MEMBER OF THE FORT UNION FM)
125LOCB	LOCAL COALS - FT UNION FM
125MKCB	MCKAY COAL * FORT UNION FORMATION
125MKOB	MCKAY OVERBURDEN-SANDSTONE - FT UNION FM
125MMCB	MAMMOTH COAL OF THE FT UNION FM.
125MMOB	MAMMOTH COAL OVERBURDEN - FT UNION FM
125MMUB	SUB-MAMMOTH COAL UNITS - FT UNION FM.
125MNCB	MONARCH COAL - FT UNION FM
125NACB	NANCE COAL OF THE FT UNION FM
125ODCB	ODELL COAL
125ODUB	ODELL COAL UNDERBURDEN
125OTCB	OTTER COAL OF THE FT UNION FM
125OTUB	OTTER COAL UNDERBURDEN
125PLNC	PLUTONIC ROCKS (PALEOCENE)
125PWCB	PAWNEE COAL
125PWUB	PAWNEE COAL UNDERBURDEN
125RBCB	ROSEBUD COAL * FORT UNION FORMATION
125RBMI	ROSEBUD-MCKAY INTERBURDEN * FT UNION FM.
125RBOB	ROSEBUD OVERBURDEN SANDSTONE - FT UNION FM.
125RLCB	ROLAND COAL - FT UNION FM
125ROBN	ROBINSON COAL OF THE FORT UNION FORMATION
125SAIB	SMITH/ANDERSON INTERBERDON - FT UNION FM.
125SDMS	SEDIMENTS (PALEOCENE)
125SMCB	SMITH COAL OF THE FORT UNION FORMATION
125SMOB	SMITH COAL OVERBURDEN OF THE FORT UNION FORMATION
125SNLB	SENTINEL BUTTE MEMBER (OF FT UNION FM.)
125SRSL	SUB-ROBINSON SILT OF THE FT UNION FM.
125SUMK	SUB-MCKAY SANDSTONE OF THE FT UNION FM.
125SWCB	SAWYER COAL
125SWUB	SAWYER COAL UNDERBURDEN
125TGRV	TONGUE RIVER MEMBER (OF FT UNION FM.)
125TLCK	TULLOCK MEMBER (OF FT UNION FM.)
125UDFD	PALEOCENE UNDIFFERENTIATED
125VLCC	VOLCANICS (PALEOCENE)
125WACB	WALL COAL - FT UNION FM
125WAOB	WALL COAL OVERBURDEN - FT UNION FM
125WAUB	WALL COAL UNDERBURDEN
125WLCK	WILLOW CREEK FORMATION (LATE CRETACEOUS)
200PLNC	PLUTONIC ROCKS (MESOZOIC)
200SDMS	SEDIMENTS (UNDIFFERENTIATED)
200UDFD	MESOZOIC UNDIFFERENTIATED
200VLCC	VOLCANICS (MESOZOIC)
210CRCS	USGS GEOLOGIC CODE (MEANING ?)
210PLNC	PLUTONIC ROCKS (CRETACEOUS)
210SDMS	SEDIMENTS (CRETACEOUS)
210UDFD	CRETACEOUS UNDIFFERENTIATED
210VLCC	VOLCANICS (CRETACEOUS)
211ACRK	ASH CREEK SANDSTONE MEMBER (OF STEELE SHALE)
211ADLM	ADEL MOUNTAIN VOLCANICS
211ASPN	ASPEN SHALE
211BDBT	BOULDER BATHOLITH
211BDRV	BOULDER RIVER SS MEMBER (OF FRONTIER FM.)
211BGEK	BIG ELK SANDSTONE (OF COLORADO GROUP)
211BLCK	BULL CREEK SANDY LIMESTONE MEM (OF GREENHORN FM)
211BLDB	USGS CODE (BOULDER BATHOLITH?)
211BLFC	BELLE FOURCHE SHALE MEMBER (OF GRANEROS FM)
211BMCK	BILLMAN CREEK FORMATION (OF LIVINGSTON GROUP)
211BNTN	BENTON SHALE (OF COLORADO GROUP)
211BRPW	BEARPAW SHALE
211BSIN	BASIN SHALE
211BVCK	BEAVER CREEK CHALKY MEMBER (OF NIOBRARA FM)
211BWDN	BOWDOIN SANDSTONE
211CBRL	COBERLY FORMATION (OF COLORADO GROUP)
211CKDL	COKEDALE FORMATION (OF LIVINGSTON GROUP)
211CLGT	CLAGGETT SHALE OR FORMATION
211CLNC	CLANCY GRANODIORITE
211CLRD	COLORADO SHALE OR FM. (OF COLORADO GROUP)
211CODY	CODY SHALE
211COGT	COLGATE SANDSTONE MEMBER (OF FOX HILLS FM.)
211CONE	CONE CALCAREOUS MEM (OF MARIAS RIVER FM)
211CRCK	CARTER CREEK FORMATION (OF COLORADO GROUP)
211CRLL	CARLILE SHALE (OF COLORADO GROUP)
211DBTL	IDAHO BATHOLITH
211EGLE	EAGLE SANDSTONE
211ELKB	ELK BASIN SANDSTONE MEMBER (OF TELEGRAPH CK FM)
211ELKM	ELKHORN MOUNTAINS VOLCANICS
211FHHC	FOX HILLS-HELL CREEK AQUIFER
211FLWR	FLOWEREE MEMBER (OF MARIAS RIVER FM.)
211FRDG	FERDIG SHALE MEMBER (OF MARIAS RIVER FM.)
211FRHS	FORT HAYS LIMESTONE MEMBER (OF NIOBRARA FM)
211FRNR	FRONTIER FORMATION
211FSCL	FISH SCALE ZONE (IN GREENHORN FM.)
211FWSK	FIRST WHITE SPECKS (IN NIOBRARA FM.)
211FXHL	FOX HILLS FORMATION OR SANDSTONE
211GMMN	GAMMON FERRUGINOUS MEMBER (OF PIERRE SHALE)
211GRNR	GREENHORN LIMESTONE (OF COLORADO GROUP)
211GROT	GROAT SANDSTONE BED (OF PIERRE SHALE)
211GRRS	GRANEROS SHALE (OF COLORADO GROUP)
211GSPK	GOLDEN SPIKE FM (OF MONTANA GROUP)
211HLCK	HELL CREEK FORMATION
211HLTR	HOLTER MEMBER (OF MARIAS RIVER FM.)
211HPRS	HOPPERS FORMATION (OF LIVINGSTON GROUP)
211HRSF	HORSETHIEF SANDSTONE (OF MONTANA GROUP)
211JDRV	JUDITH RIVER FORMATION (OF MONTANA GROUP)
211JENS	JENS FORMATION (OF COLORADO GROUP)
211KVIN	KEVIN SHALE MEMBER (OF MARIAS RIVER FM)
211LHUD	LANCE-HELL CREEK UNDIFFERENTIATED
211LNCE	LANCE FORMATION
211LNNP	LENNEP SANDSTONE (OF MONTANA GROUP)
211LVGS	UPPER CRETACEOUS LIVINGSTON GROUP
211LVIS	LIVINGSTON IGNEOUS SERIES (OF LIVINGSTON GROUP)
211LWIS	LEWIS SHALE OR FORMATION-WYOMING
211MMHL	MONUMENT HILL BENTONITE MEMBER (OF PIERRE SH)
211MNTN	MONTANA GROUP
211MRCK	MINER CREEK FORMATION (OF LIVINGSTON GROUP)
211MRRV	MARIAS RIVER FORMATION (OF COLORADO GROUP)
211MSBY	MOSBY SANDSTONE MEMBER (OF WARM CREEK SHALE)
211MTTN	MITTEN BLACK SHALE MEMBER (OF PIERRE SHALE)
211MTTS	MEETEETSE FORMATION-WYOMING
211MVRD	MESAVERDE FORMATION OR GROUP-WYOMING
211NBRR	NIOBRARA FM. OR LIMESTONE (OF COLORADO GP)
211PDRO	PEDRO BENTONITE BED (OF PIERRE SHALE)
211PEAY	PEAY SANDSTONE MEMBER (OF FRONTIER FM.)
211PINY	PINEY FORMATION-WYOMING
211PIRR	PIERRE SHALE (OF MONTANA GROUP)
211PLNC	PLUTONIC ROCKS (UPPER CRETACEOUS)
211PLPS	PHILLIPS SANDSTONE
211PRKM	PARKMAN SANDSTONE (OF MONTANA GROUP)
211RDBD	RED BIRD SILTSTONE MEMBER (OF PIERRE SHALE)
211SCGR	SCRATCHGRAVEL HILLS STOCK
211SGBK	SAGE BREAKS SHALE MEMBER (OF NIOBRARA SHALE)
211SGHN	SAGE HEN LIMESTONE (OF COLORADO SHALE)
211SLPF	SULPHUR FLATS SS MEMBER (OF LIVINGSTON GROUP)
211SMKH	SMOKY HILL CHALK MEMBER (OF NIOBRARA SHALE)
211SMRV	ST. MARY RIVER FORMATION
211SMSM	SLIM SAM FORMATION
211SNNN	SHANNON SANDSTONE MBR. (OF CODY OR STEELE SH)
211SPCK	SOAP CREEK BENTONITE BED (MEMBER OF FRONTIER FM)
211SSPG	SHARON SPRINGS MEMBER (OF PIERRE SHALE)
211SSSX	SUSSEX SANDSTONE MEMBER (OF CODY SHALE)
211STEL	STEELE SHALE
211SVLF	STONEVILLE FLATS LIMESTONE MEM (OF BELLE FOURCHE)
211SWSK	SECOND WHITE SPECKS (IN GREENHORN LIMESTONE)
211TBBT	TOBACCO ROOT BATHOLITH
211TCLG	TORCHLIGHT SANDSTONE MEMBER (OF FRONTIER FM)
211TMBS	TOMBSTONE SANDSTONE
211TMDC	TWO MEDICINE FORMATION (OF MONTANA GROUP)
211TPCK	TELEGRAPH CREEK FORMATION (OF MONTANA GROUP)
211TPOT	TEAPOT SANDSTONE MEMBER (OF MESAVERDE FM.)
211TRBT	TOBACCO ROOT BATHOLITH
211TRNR	TURNER SANDY MEMBER (OF CARLILE SHALE)
211UDFD	UPPER CRETACEOUS UNDIFFERENTIATED
211UNVL	UNIONVILLE GRANODIORITE
211VLCC	VOLCANICS (UPPER CRETACEOUS)
211VRGL	VIRGELLE SANDSTONE MEMBER (OF EAGLE SANDSTONE)
211WLCK	WALL CREEK SANDSTONE MEMBER (OF FRONTIER FM)
211WMCK	WARM CREEK SHALE (OF COLORADO GROUP)
217ALBN	ABINO SHALE MEMBER (OF THERMOPOLIS SHALE)
217AMFK	AMERICAN FORK FORMATION
217BCKF	BLACKLEAF FORMATION (OF COLORADO GROUP)
217BILD	BOW ISLAND SANDSTONE
217BLCD	BASAL COLORADO SILTSTONE (OR DAKOTA SILT)
217BLGR	BOOTLEGGER MEMBER (OF BLACKLEAF FM.)
217BRDD	BIRDHEAD SANDSTONE MEMBER (OF THERMOPOLIS FM)
217CBNK	CUT BANK SANDSTONE
217CLSN	CHILSON MEMBER (OF LAKOTA FM.)
217CLSP	CLAY SPUR BENTONITE BED (OF MOWRY SHALE)
217CLVL	CLOVERLY FORMATION
217CPRN	CYPRIAN SANDSTONE MEMBER (OF THERMOPOLIS SH)
217DKBG	DUNKLEBERG MEMBER (OF BLACKLEAF FM.)
217DKOT	DAKOTA SANDSTONE FORMATION OR GROUP
217DRLG	DARLING SANDSTONE
217FCCK	FIRST CAT CREEK SANDSTONE (BASE OF COLORADO GP)
217FLOD	FLOOD SHALE MEMBER (OF BLACKLEAF FM.)
217FLRV	FALL RIVER FORMATION (OF INYAN KARA GROUP)
217FUSN	FUSON MEMBER (OF LAKOTA FM.)
217GRBL	GREYBULL SANDSTONE MEMBER (OF CLOVERLY FM)
217HINS	HINES MEMBER (OF CLOVERLY FM.)
217INKR	INYAN KARA GROUP
217KOTN	KOOTENAI FORMATION
217LKOT	LAKOTA SANDSTONE (OF INYAN KARA GROUP)
217LLSP	LITTLE SHEEP MEMBER (OF CLOVERLY FM.)
217LPTN	LUPTON SAND (OF KOOTENAI FM) (2ND CAT CREEK SAND)
217MDDY	MUDDY SANDSTONE MEMBER (OF THERMOPOLIS SHALE)
217MLTN	MOULTON SANDSTONE
217MSSR	MOSSER SANDSTONE
217MWRY	MOWRY SHALE (OF COLORADO GROUP)
217NCSL	NEWCASTLE SANDSTONE MEMBER (OF GRANEROS SHALE)
217PLNC	PLUTONIC ROCKS (LOWER CRETACEOUS)
217PRYR	PRYOR CONGLOMERATE MEMBER (OF CLOVERLY FM)
217RSTY	RUSTY BEDS (IN THERMOPOLIS SHALE)
217SBRS	SUNBURST SANDSTONE
217SCCK	SECOND CAT CREEK SANDSTONE (OF KOOTENAI FM)
217SDMS	SEDIMENTS (LOWER CRETACEOUS)
217SKCK	SKULL CREEK SHALE MEMBER (OF GRANEROS SHALE)
217TCCK	THIRD CAT CREEK SANDSTONE (BASAL KOOTENAI FM)
217TFHL	TAFT HILL MEMBER (OF BLACKLEAF FM.)
217TMPL	THERMOPOLIS SHALE
217UDFD	LOWER CRETACEOUS UNDIFFERENTIATED
217VGHN	VAUGHN MEMBER (OF BLACKLEAF FM.)
217VKNG	VIKING SANDSTONE-CANADA
217VLCC	VOLCANICS (LOWER CRETACEOUS)
220SUDE	SAUDE FORMATION (JURASSIC-TRIASSIC)
220UDFD	JURASSIC UNDIFFERENTIATED
221BRDL	BRINDLEY SANDSTONE (OF MORRISON FM.)
221CSPG	CANYON SPRINGS SANDSTONE MEM (OF SUNDANCE FM)
221ELLS	ELLIS GROUP
221HLTT	HULETT SANDSTONE MEMBER (OF SUNDANCE FM)
221LAK	LAK MEMBER (OF SUNDANCE FM.)
221MRSN	MORRISON FORMATION
221RDTR	REDWATER SHALE MEMBER (OF SUNDANCE FM.)
221RRDN	RIERDON FORMATION (OF ELLIS GROUP)
221SKBV	STOCKADE BEAVER SHALE MEMBER (OF SUNDANCE FM)
221SNDC	SUNDANCE FORMATION
221SWFT	SWIFT FORMATION (OF ELLIS GROUP)
221UDFD	UPPER JURASSIC UNDIFFERENTIATED
221VGRD	VANGUARD FORMATION
224BOWS	BOWES MEMBER (OF PIPER FM.)
224FRMN	FIREMOON LIMESTONE MEMBER (OF PIPER FM.)
224GPSP	GYPSUM SPRING FORMATION
224KLIN	KLINE MEMBER (OF NESSON FM.)
224NSSN	NESSON FORMATION
224PCRD	PICARD MEMBER (OF NESSON FM.)
224PIPR	PIPER FORMATION
224POE	POE MEMBER (OF NESSON FM.)
224STTH	SAWTOOTH FORMATION (OF ELLIS GROUP)
224TMPC	TAMPICO MEMBER (OF PIPER FM.)
224UDFD	MIDDLE JURASSIC UNDIFFERENTIATED
230ALCV	ALCOVA LIMESTONE MEMBER (OF CHUGWATER FM.)
230BWLR	BOWLER FORMATION
230CGTR	CHUGWATER FORMATION
230CRMN	CROW MTN SANDSTONE MEMBER (OF CHUGWATER FM)
230GSEG	GOOSE EGG FORMATION
230RDPK	RED PEAK MEMBER (OF CHUGWATER FM.)
230SPRF	SPEARFISH FORMATION
230UDFD	TRIASSIC UNDIFFERENTIATED
230WDSD	WOODSIDE SHALE
231PPAG	POPO AGIE MEMBER OF CHUGWATER FM.
231UDFD	UPPER TRIASSIC UNDIFFERENTIATED
237DNDY	DINWOODY FORMATION
237TYNS	THAYNES LIMESTONE FORMATION OR GROUP
237UDFD	LOWER TRIASSIC UNDIFFERENTIATED
237WDSD	WOODSIDE FORMATION SILTSTONE OR REDBEDS
300PLNC	PLUTONIC ROCKS (PALEOZOIC)
300SDMS	SEDIMENTS (PALEOZOIC)
300UDFD	PALEOZOIC UNDIFFERENTIATED
300VLCC	VOLCANICS (PALEOZOIC)
310ERVY	ERVAY MEMBER OF TONGUE (OF PHOSPHORIA FM)
310FRNS	FRANSON MEMBER OR TONGUE (OF PARK CITY FM)
310GRDR	GRANDEUR MEMBER (OF PARK CITY FM.)
310MDPK	MEADE PEAK PHOSPHATIC SHALE MBR. (OF PHOSPORIA FM)
310PNSL	PINE SALT MEMBER (OF SPEARFISH FM.)
310PRKC	PARK CITY FORMATION OR GROUP
310PSPR	PHOSPHORIA FORMATION
310REX	REX CHERT MEMBER (OF PHOSPHORIA FM.)
310RTRT	RETORT PHOSPHATIC SHALE MBR. (OF PHOSPHORIA FM)
310SDRN	SHEDHORN SANDSTONE
310TOSI	TOSI CHERT MEMBER OR TONGUE (OF PHOSPHORIA FM)
310UDFD	PERMIAN UNDIFFERENTIATED
317MNKT	MINNEKAHTA LIMESTONE MEMBER (OF GOOSE EGG FM)
317OPCH	OPECHE SHALE
317UDFD	LOWER PERMIAN UNDIFFERENTIATED
320AKBC	ALASKA BENCH LIMESTONE OF AMSDEN GROUP
320AMSD	AMSDEN GROUP
320BGLC	BEAR GULCH LIMESTONE MEMBER (OF TYLER FM.)
320CMCK	CAMERON CREEK MEMBER (OF TYLER FM.)
320DRWN	DARWIN SANDSTONE (OF AMSDEN GROUP)
320DVPK	DEVILS POCKET FORMATION (OF AMSDEN GROUP)
320MNLS	MINNELUSA SANDSTONE OR FORMATION
320QDRN	QUADRANT QUARTZITE
320SNSC	STONEHOUSE CANYON MEMBER (OF TYLER FM.)
320TSLP	TENSLEEP SANDSTONE
320TYLR	TYLER FORMATION (OF AMSDEN GROUP)
320UDFD	PENNSYLVANIAN UNDIFFERENTIATED
330BKKN	BAKKEN FORMATION
330CLRF	CASTLE REEF DOLOMITE (OF MADISON GROUP)
330EGLD	ENGLEWOOD FORMATION
330HNNH	HANNAH LIMESTONE
330MDLC	MIDDLE CANYON FORMATION (OF WHITE KNOB GROUP)
330MDSN	MADISON GROUP OR LIMESTONE
330MLGN	MILLIGAN FORMATION
330SCPK	SCOTT PEAK FORMATION (OF WHITE KNOB GROUP)
330SCRK	SOUTH CREEK FORMATION (OF WHITE KNOB GROUP)
330SRCN	SURRETT CANYON FORMATION (OF WHITE KNOB GROUP)
330SRVR	SUN RIVER MEMBER (OF CASTLE REEF DOLOMITE)
330UDFD	MISSISSIPPIAN UNDIFFERENTIATED
330WKNB	WHITE KNOB LIMESTONE OR GROUP - IDAHO
331A	'A' ZONE (OF CHARLES FORMATION)
331B	'B' ZONE (OF CHARLES FORMATION)
331BGSN	BIG SNOWY GROUP
331C	'C' ZONE (OR 'BERENTSON' ZONE) (OF CHARLES FM)
331CRLS	CHARLES FORMATION (OF MADISON GROUP)
331HETH	HEATH FORMATION OR SHALE OF BIG SNOWY GROUP
331KBBY	KIBBEY SANDSTONE (OF BIG SNOWY GROUP)
331MIDL	'MIDALE' ZONE (OF CHARLES FORMATION)
331OTTR	OTTER FORMATION (OF BIG SNOWY GROUP)
331RCHY	RICHEY SHALE ZONE (IN CHARLES FM.)
331UDFD	UPPER MISSISSIPPIAN UNDIFFERENTIATED
337ALMN	ALLEN MOUNTAIN LIMESTONE (OF MADISON GROUP)
337CNDC	COTTONWOOD CANYON MEMBER (OF LODGEPOLE LMST)
337D	D' ZONE (OF MISSION CANYON FM.)
337DNLK	DEAN LAKE CHERT MEMBER (OF MADISON LIMESTONE)
337EXSH	EXSHAW SHALE
337LCFC	LITTLE CHIEF CANYON MBR. OF LODGEPOLE LIMESTONE
337LDGP	LODGEPOLE LIMESTONE OR FM. (OF MADISON GP)
337MNRM	MONITOR MTN. LIMESTONE MEMBER (OF MADISON GP)
337MSNC	MISSION CANYON LIMESTONE (OF MADISON GROUP)
337PHSP	PAHASAPA LIMESTONE - SOUTH DAKOTA
337PINE	PAINE SHALE MEMBER (OF LODGEPOLE FM.)
337RONY	ROONEY CHERT MEMBER (OF MADISON LIMESTONE)
337SLVP	SILVERTIP CONGLOMERATE MEMBER (OF MADISON GP)
337SPNG	SAPPINGTON FORMATION
337SYPO	SAYPO LIMESTONE MEMBER (OF MADISON LIMESTONE)
337TRFK	THREE FORKS SHALE LIMESTONE OR FORMATION
337UDFD	LOWER MISSISSIPPIAN UNDIFFERENTIATED
337WDRS	WOODHURST LIMESTONE MEMBER (OF LODGEPOLE FM)
340UDFD	DEVONIAN UNDIFFERENTIATED
341BRDB	BIRDBEAR MEMBER (OF JEFFERSON LIMESTONE)
341BVLK	BEAVERHILL LAKE GROUP OR FORMATION
341CPLK	COOPERS LAKE LIMESTONE MEMBER (OF JEFFERSON FM)
341DPRW	DUPEROW FORMATION (OF JEFFERSON GROUP)
341DRBY	DARBY FORMATION
341GLCK	GLEN CREEK SHALE MEMBER (OF JEFFERSON LIMESTONE)
341GRDV	GRAND VIEW DOLOMITE - IDAHO
341JFRS	JEFFERSON LIMESTONE
341LGGC	LOGAN GULCH MEMBER (OF THREE FORKS FM.)
341LNBT	LONE BUTTE LIMESTONE MEMBER (OF JEFFERSON FM)
341NSKU	NISKU FORMATION
341PTLC	POTLATCH FORMATION OR ANHYDRITE
341SPDB	SPOTTED BEAR LIMESTONE MEMBER (OF JEFFERSON GP)
341SRRV	SOURIS RIVER FORMATION
341TRDN	TRIDENT MEMBER (OF THREE FORKS FORMATION)
341UDFD	UPPER DEVONIAN UNDIFFERENTIATED
341UNON	UNION SHALE
341WDBD	WOODBEND FORMATION - ALBERTA
341WRDG	WHITE RIDGE LIMESTONE MEMBER (OF JEFFERSON GP)
344ASRN	ASHERN FORMATION (OF ELK POINT GROUP)
344BRTB	BEARTOOTH BUTTE FORMATION
344DSNB	DAWSON BAY FORMATION
344ELKP	ELK POINT GROUP
344MYWD	MAYWOOD FORMATION
344PRIR	PRAIRIE EVAPORITE FORMATION (OF ELK POINT GP)
344UDFD	MIDDLE AND LOWER DEVONIAN UNDIFFERENTIATED
344WPGS	WINNEPEGOSIS FORMATION (OF ELK POINT GROUP)
350IRLK	INTERLAKE FORMATION
350LKTN	LAKETOWN DOLOMITE - UTAH
350UDFD	SILURIAN UNDIFFERENTIATED
360UDFD	ORDOVICIAN UNDIFFERENTIATED
361BGRN	BIGHORN DOLOMITE
361GNTN	GUNTON MEMBER (OF STONY MOUNTAIN FM.)
361HRDG	HARDING SANDSTONE (OF BIGHORN DOLOMITE)
361LIGH	LEIGH DOLOMITE MEMBER (OF BIGHORN DOLOMITE)
361LNDR	LANDER SANDSTONE (OF BIGHORN DOLOMITE)
361RDRV	RED RIVER FORMATION (OF BIGHORN GROUP)
361SNMN	STONY MOUNTAIN FORMATION (OF BIGHORN GROUP)
361STGN	STOUGHTON MEMBER (OF STONY MOUNTAIN FM.)
361UDFD	UPPER ORDOVICIAN UNDIFFERENTIATED
361WHTD	WHITEWOOD DOLOMITE
364ALDN	ALADDIN SANDSTONE - SOUTH DAKOTA
364ICBX	ICE BOX SHALE - SOUTH DAKOTA
364KNKC	KINNIKINIC QUARTZITE
364RGCK	ROUGHLOCK SILTSTONE - SOUTH DAKOTA
364WNPG	WINNIPEG FORMATION
370BKSP	BUCK SPRING FORMATION
370CMBR	CAMBRIAN UNDIFFERENTIATED
370HMRK	HASMARK FORMATION OR DOLOMITE
371DDWD	DEADWOOD FORMATION
371DRBR	DEARBORN LIMESTONE
371DRCK	DRY CREEK SHALE
371DUNR	DU NOIR LIMESTONE MEMBER (OF GALLATIN LIMESTONE)
371DVLG	DEVILS GLENN DOLOMITE
371GLTN	GALLATIN GROUP
371GVCK	GROVE CREEK MEMBER (OF SNOWY RANGE FM.)
371OPDR	OPEN DOOR LIMESTONE (OF GALLATIN LIMESTONE)
371PLGM	PILGRIM LIMESTONE OR DOLOMITE
371RDLN	RED LION FORMATION
371SNRG	SNOWY RANGE FORMATION (OF GALLATIN GROUP)
371YOGO	YOGO LIMESTONE
374ALPR	ALPRESTON QUARTZITE
374DCNN	DEATH CANYON LIMESTONE MEMBER (OF GROS V
374DMNN	DAMNATION LIMESTONE
374EMRS	EMERSON FORMATION
374FLTD	FLATHEAD QUARTZITE OR SANDSTONE
374GRDN	GORDON SHALE
374GRVR	GROS VENTRE FORMATION
374MGHR	MEAGHER LIMESTONE
374PARK	PARK SHALE OR ARGILLITE
374PGOD	PAGODA LIMESTONE
374PNGN	PENTAGON SHALE
374SCBK	SWITCHBACK SHALE
374SLVH	SILVER HILL FORMATION
374TLDN	TILDEN FORMATION
374WLSY	WOLSEY SHALE OR FORMATION
377STMB	STEAMBOAT LIMESTONE
377UDFD	LOWER CAMBRIAN UNDIFFERENTIATED
400AHRN	AHORN QUARTZITE
400ALTN	ALTYN LIMESTONE
400APCK	APPLE CREEK FORMATION
400APKN	APPEKUNNY FORMATION
400BCKF	BLACKFOOT FORMATION
400BCRD	BOUCHARD FORMATION (OF MISSOULA GROUP)
400BELT	BELT SUPERGROUP
400BNNR	BONNER QUARTZITE (OF MISSOULA GROUP)
400BURK	BURKE FORMATION (OF RAVALLI GROUP)
400CMBL	CHAMBERLAIN SHALE
400COOK	COOK GRANITE
400CPCK	CAMP CREEK GROUP
400CYUS	CAYUSE LIMESTONE
400EMPR	EMPIRE FORMATION
400GCRK	GOOSE CREEK GRANITE
400GRNL	GRINNELL FORMATION (OF RAVALLI GROUP)
400GRRG	GARNET RANGE QUARTZITE OR FORMATION
400GRRM	GREENHORN MOUNTAIN QUARTZITE
400GRSN	GREYSON SHALE
400GTWY	GATEWAY FORMATION
400HDLY	HOADLEY FORMATION
400HELN	HELENA DOLOMITE
400HLGT	HELLGATE QUARTZITE MEM (OF MILLER PEAK ARGILLITE)
400KNTL	KINTLA ARGILLITE (OF MISSOULA GROUP)
400LBBY	LIBBY FORMATION (OF MISSOULA GROUP)
400LHOD	LAHOOD FORMATION
400LMHI	LEMHI QUARTZITE - IDAHO
400LUPN	LUPINE QUARTZITE (OF MISSOULA GROUP)
400MCMR	MCNAMARA ARGILLITE OR FM. (OF MISSOULA GP)
400MCRB	MIDDLE BELT CARBONATE
400MLPK	MILLER PEAK ARGILLITE OR FM (OF MISSOULA GROUP)
400MMPC	METAMORPHIC ROCKS
400MRSH	MARSH FORMATION (OF MISSOULA GROUP)
400MSSL	MISSOULA GROUP
400NHRT	NEIHART QUARTZITE
400NLND	NEWLAND FORMATION OR LIMESTONE
400PIGN	PIEGAN GROUP
400PLCR	PILCHER QUARTZITE (OF MISSOULA GROUP)
400PRCD	PRICHARD FORMATION OR SLATE
400PRCL	PURCELL BASALT (OF MISSOULA GROUP)
400RRBR	ROCK RABBIT RIDGE QUARTZITE
400RVLL	RAVALLI GROUP
400RVTT	REVETT FORMATION (OF RAVALLI GROUP)
400SIYH	SIYEH LIMESTONE (OF PIEGAN GROUP)
400SLWY	SLOWAY FORMATION (OF MISSOULA GROUP)
400SPKN	SPOKANE SHALE
400SPRC	SPRUCE FORMATION (OF MISSOULA GROUP)
400SPRD	SHEPARD FORMATION (OF MISSOULA GROUP)
400SRGS	ST REGIS FORMATION (OF RAVALLI GROUP)
400STRP	STRIPED PEAK FORMATION (OF MISSOULA GROUP) MID PRO
400SWGR	SWAUGER QUARTZITE - IDAHO
400UDFD	PRECAMBRIAN UNDIFFERENTIATED
400WLLC	WALLACE FORMATION (OF PIEGAN GROUP)
500CRCK	CHERRY CREEK GROUP - PRE-BELT
500GNSC	GNEISS AND SCHIST (EARLY PROTEROZOIC OR ARCHEAN)
500PCMB	PRECAMBRIAN (EARLY PROTEROZOIC OR ARCHEAN)
500PONY	PONY SERIES - PRE-BELT
500PRBL	PRE-BELT
500STLR	STILLWATER COMPLEX (ARCHEAN)