GENERAL OUTCROP SECTION OF THE BLACK HILL.S AREA QUATERNARY FORMATION SECTION DESCRIPTION PLIOCENE O-!5o' "'ANoS AND GRAVELS :,: '. . . . . .. ... 0-100 OGAI:LALA GROUP MIOCENE ARIKAREE GROUP ~ OLIGOCENE <l I- 0: •••• I- ~-?- WHITE RIVER GROUP HELL CREEK FORMATION (Lance Fo,motlon) Scnd, grovel, and boulde,•• Lltptt co/or~ 80n. and .(If&. UPPER FOX HILLS FORMATION 2!5-200 Grayish-white to yellow .sandstone Principal horlzo!, or limestone len ••• ol-.•• /ng t•• p•• butt •• Dork-groy .hol. contolnlng .eott.red concretions. Widely .coU.red UIn•• tone mou.,. g/.,/ng smoll tapH buHu ':.". ".- ' ..... PIERRE B/oclc 11"11. shol. with coner.llons Impur. chollt and colcor~u. shale LIght -gray shol. with numerous large concretions and sandy /oy.r s. Doric -gray shol. (2~- 30) Impur. .'obby.llm."fon.. Weathe,.. buff. \ E===--~---====----===------=====---~~200-350) Oork-groy calcor.ous thol., wit" thin Orman Lok. IIm.done .ot bose. ~- - - - -~ Groy shol. w"h scott.red I,,,, •• 'one .~~~~ 300-550 toner."on •. ~ Cloy ~pur bentonite 'ot bo ••. ~~----------------------~~==~==~==~~==~==~==~==~------~~~~~~~~--~ &I: ~ :=-~I _SO=_-::2-:50_I_-L-lg...:h::.,:::-g~r:..:o:::Y:..':.:i12IC:..~OU:...':=-'!:hO::'::..::. :.:F:.:~.:...h_5C_O_IO_. -I ~ MOWRY SHALE ~ =~ ond Ihin loy.,. 0' ~••• ""lto ;: NEWCASTLE SANDSTONE" .:.' .. : .-: : .:,' ,.,: "".". .: .. : ,, :. ~2~0~--=6..:0_I_::B:.:ro:.:w:::n:...':.:o...:I:.!lg~h::.'.!.y..:.:.:llo::.,:....:o:::n:.:d-.,~h~I.:.;'.~·..:.:..on~d:.:.:..'-:::.::.... __ ~ CI SKULL CREEK SHALE ~===-=--~ LOWER Massi •••• to 51abby sotKl5ton e. JURASSIC SHALE 120o-200c Oar" gray '0 block 5hal. ~·==o=·----====-------·--==~ 10-188 0-25 MINNELUSA FORMATION B····· _~ .. Ii·· 350-850 =: = NIOBRARA FORMATION 100-22!5 25-48!5 Coaru gray to buff eron-b.dded con- glom.rotlc ss, Int.rb.dd.d ."ith buff, r.d, and gray cloy. especially toword top. Local fin.-groin.d limes ton •.. .. '. '. '. '. : .•... : '. '. '. :' .': .•.•. ~"\..:0::_.-~2~2.::0~......:G:.:r.: •• ::n:....:.':.o..:m:::o::r.:o.:on~.::h::o:..'.:.:._T:...":..'~n....::.o:.:n::d:...'::o~n= •. _I ENGLEWOOD LIMESTONE 10-400 Schi~t, slot •• quortzlte, and arkosic gr.it. Intrud.d by dio,it., m.tomorpllosed to oMphibolit., and by fI,onite and p.gmatlte. DEVONIAN ~ MISSISSIPPIAN PAHASAPA (MADISOH) LIMESTONE Tv,n., Sand Zone "t>: :.':: :.: .>:.';::: -: :.::',~ CARLILE FORMATION ~~~~ Wall Creek Sandi EC=:--=--=----=-- ====== 400-7!50 GREENHORN FORMATION BELLE FOURCHE SHALE Gr•• nlsh-groy sho/., thin limutone I.u •• GlauconitIc sandston.; r.d IS. ".or mldd I. PERMIAN 170-270 FALL RIVER [DAKOTA (71] II .:=--: ::.: :': ..- .:.•. :.- :. ::.::.:: .r> 10-200 PENNSYLVANIAN ORDOVICIAN CAMBRIAN METAMORPHIC and IGNEOUS ROCKS PRE -CAMBRIAN _ , Fuson Shale :; 2, I Minnewasfe Is ~•.. ..J MORRISON FORMATION ........ ~. I- y.llow to r.d cross -b.dded sond~tolt e, Jimedone, ond onhydrit. locolly at ,op. Interb.dded sonddona, limestone, dolomit., thole, and anhydrite .. R.d .ho/e with Int.rbedd.d limestone and .and .• tOll. ot bas •. Alau've Hght-colo,ed lime&tone. Dolomlt. in par'. Cov.rnous in upper po,t. PinJc '0 buff IIm.stone. Sho,. locallv 0' bas •. Buff do/omlt. ond limes ton•. Gr•• n lltol. with ti/tstOlle •.• o.~I::,., bfr!ggSyOd~~!~,~. :;:e;,':thpet':,~CO"ItIC ~~~~~~:roc,:nf~~=,~~G!~. th!ob~:~~ne. w"h 1963 UNKPAPA SS SUNDANCE FM 250-450 300-630 30-60 WHITEWOOD (REO RIVER) FORMATION WINNIPEG FORMATION . ,",0-60 0-100 DEADWOOD FORMATION DEPARTMENT OF GEOLOGY AND GEOLOGICAL ENGINEERING SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY RAPID CITY, SOUTH DAKOTA -------