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9 ST oti @G DEPARTMENT OF THE INTERIOR �s UNITED STATES GEOLOGICAL SURVEY 105 °15• T 3 S. T 4 S. I r3'Adm 3 � m I I 1 V 4230° - O 1 \ \\ 7 Ii 2 w W K 17 or W W 0 40 T. 4S. T. 5 S 39 °37'30' C( O �l ir O Td. •�r �'' / S " M O � =�r �ry CreG o u � �• %%% # ## a a ti erso \�'E+ ne � ° =_ _ = =s = = == ou Tdx � m '. •i ` -.r +• 4 \, r. - ¢ a> CAMP GEORG ST /) r• �; ;.).,q ' a +••y °.e r ' / ` \\;1`�'•\ `�- s (NATI AL o -_ _ . / J �'G • 33 A - I K a flume Ln feOT$ BO '° `�� n s>zs w,.��etxa \ o, r it LANE \ 1 KP 1 11 _ d /••..� l7 e �" -etl °p� Cem f •r; — _ W Sch . Gu, munity RO �\ \� asm .•/. :i • a \ V Ka RadloTwn:so — _ •••• •• °• ••t easant ViV lw �.. KGOU •= n ./ '�, j'• / ¢ �' o°. •Flinn II =Coe ••i � •TKd cN z. �32a " � �� \ '"Irter %J . /OJ � ___ ... •. .•.• __i— - �`'�� / l / � � ° d\ \ p, .. o• n i �' 7__i �. � .% t•. \.�i -tea. / _ -_ �_�_ \r)JereYWGounq I I \ J B : r • I , + n fd - Itl dp ....., / / C '\ /a �I i 1 x il'� • °; Imo__ -i I ^1/� lO C Fd1f81Wlld J .x \ 6000 •" Y " ° ° °� °O II \ \\ N .' a lO � d (I�1 ,� '•N PI d Y., � / _ Q " o \ + • 1 / 603? ohs - 1l /3 °F inch ° b 1 H C'D�� _ v l� \V-1 K II, nn \ �n +sl< + 1 I 36 � f 1 Gra a voll �`"��'�� I'"'' 11111�1�� ` \111)P11��1►�%+1.1'11�ti1�►r�c Q I J °wol 4 16 _A 2 C ID c \ 4 1 Kp II r I \\ KI J ' \ s + 5\ n + + I b 4 TKd Pa o of w na �3 t k�\ �\ R / 6 UNION S3 aa \ 3 Qq KP � 2 wdeeL lie Pa ro � p f ..� P \I \ DI 1 d 6•�•� •� �i /n� Il ins ,;_j R- %n w. t!V R. 69 W. INTER IOR- GEOLOGICAL SURVEY WASHINGTON. O f - 198111- 0e4212 105 °19 Z� Base by U.S. Geological Survey, 1957 PP t✓'S �QO z t' J A ra•- SCALE 1:24000 1 S't 0 1 MILE i - 1 .5 0 1 KILOMETER ocaingtw .wN` CONTOUR INTERVAL 40 FEET 1 DATUM IS MEAN SEA LEVEL P� PO J P� 3 9 °45' EXPLANATION Tgm Green Mountain Conglomerate of LeRoy (1946) Td3 T- TKd Denver Formation T. 3 S. Td3, youngest latite flow. Td, intermediate flow. T. 4 S. The earliest flow is not exposed in this quadrangle UNCONFORM/TY(P) Ka Arapahoe Formation UNCONFORMITY(7) KI Laramie Formation cUNCONFORMITY Kfh Fox Hills Sandstone Kp Pierre Shale Faunal zones shown by red lines; most zones are wid than lines shown, but their exact boundaries are n mapped Kris Knf Niobrara Formation Kris, Smoky Hill Shale Member. Knf, Fort Hays Limestone Member UNCONFORMITY Kb 230" Benton Shale U � Kd Dakota Group UNCONFORMITY Jm Morrison Formation UNCONFORMITY(P) ti a� Jrc Ralston Creek Formation UNCONFORMITY(?) Ti PI Lykins Formation UNCONFORMITY(9) PI Lyons Sandstone 0.{ � P�f Fountain Formation UNCONFORMITY PE Crystalline rocks Contact Dashed where approximately located; dotted where concealed - -� U'- -- D so or Normal fault, showing dip Dashed where approximately located. U, upthrown side; D, downthrown aide z _- Reverse fault Lashed where approximately located. R. upthrown side - -------- ' ------ � Probable fault J5 Strike and dip of beds Strike and dip of overturned beds T. 4 S. –4— Strike of vertical beds T. 5 S. as Strike and dip of joint Strike of vertical joint <o v's Strike and dip of beds and strike and dip of joints combined. Point of observation where joined a 0320 Location of fossil collection and the secession number of the U.S.G.S. Denver, Colo Dry hole or non-commercial well • Spring 19 °3730" Geology mapped in 1955 -59 a lt, O 2 MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I -428 1964 SEA 0_ Q W l- 0 W U Q F W fC U U W N Q fC V, U Z (n ¢N �a aLd o Z 1 ¢ Z Il Q s wZ N a¢ � z O a ¢ > w J = 1 n 10 Z to Z Of rl Q a U l' L) m U W a MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I -428 AGE GROUP OR MEMBER THICKNESS LITHOLOGY A FORMATION Great Basins Petroleum 1 i Kd S D Johnson 1 Pallaoro Pallaoro (projected) a SODO' P J \\ \\ \ \Jm Pc DAKOTA " z w o a o a W3 w3 i x GREEN MOUNTAIN i Y m 7000•. HOGBACK PI PI FPI Jrc Jm Ktl \ o 007 g i ncdf - - -- t C Ka ------ T•"'. v a - SEA LEVEL stone. Middle 250 ft, claystone, siltstone, fine - grained Kb no KIM KI \ \ \ an 6000' U \\ Pei comprised of about 50 ft of thick- bedded cobble and boulder \\ \ /K4 11 -- __— ______--- `�' - - - - -_ __ - -- \\ \�• _ —_______---------------------_---__-- \\ Z Jm I I 5000' \ \ I pegmatite, quartzite, sandstone, and volcanic rocks. Forma- \ \\ o L/, i / x l/ plastically contorted \ \ 50 \ silicified wood. \� c7 —. __ ------------ __ —_ - -_ - -_.. 4000' Yellowish -gray to moderate - brown, poorly sorted, tuffaceous, 3000' fossiliferous claystone, siltstone, mudstone, arkosic sandstone, SECTION ALONG LINE A -A' conglomerate beds, and interlayered latite flows. Conglom- GEOLOGY OF THE SEDIMENTARY ROCKS OF THE M By to o r h ritie andesite pebbles predominate. Dark e llowish- J Hiram Smith MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I -428 1964 SEA 0_ Q W l- 0 W U Q F W fC U U W N Q fC V, U Z (n ¢N �a aLd o Z 1 ¢ Z Il Q s wZ N a¢ � z O a ¢ > w J = 1 n 10 Z to Z Of rl Q a U l' L) m U W a MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I -428 AGE GROUP OR MEMBER THICKNESS LITHOLOGY q FORMATION Great Basins Petroleum 1 i Kd S D Johnson 1 Pallaoro Pallaoro (projected) a B P = no Ka, \\ \\ \ \Jm \ 4000' m 2000' 40° Upper 200 ft mainly conglomerate; some sandstone and clay- 1000' SEA LEVEL stone. Middle 250 ft, claystone, siltstone, fine - grained 2000' \ \ \ an sandstone, and conglomerate in thin beds. Lower 150 ft U \\ Pei comprised of about 50 ft of thick- bedded cobble and boulder /K4 11 600 conglomerate overlain by 100 ft of conglomerate and loose W \ sandstone in thin lenses. Conglomerates composed of gneiss, Z Jm I I API pegmatite, quartzite, sandstone, and volcanic rocks. Forma- t/ o L/, i / x l/ plastically contorted tion contains plant fossils of Paleocene age, and abundant 50 silicified wood. .0 3 C c7 a Yellowish -gray to moderate - brown, poorly sorted, tuffaceous, fossiliferous claystone, siltstone, mudstone, arkosic sandstone, conglomerate beds, and interlayered latite flows. Conglom- erate constitutes 10 percent of formation; contains pebbles to 8 in. in diameter, but averaging 11h in. Dark -gray aphanitic to o r h ritie andesite pebbles predominate. Dark e llowish- o: brown latite pebbles from the Table Mountain flows are. common. Granite pebbles abundant near base. Matrix of a pebbles is tuffaeeous claystone or coarse - grained sandstone. Heulandite occurs locally as euhedral crystals and fills W° 950 cavities in the pebbles and sandstone. Sandstone and mud- s stone comprise 50 percent of formation. Sandstone composed c of plagioclase, quartz, augite, hornblende, oxyhornblende, q magnetite, and biotite. Light - yellow montmorillonitic, locally tuffaceous, claystone constitutes 40 percent of formation. Contains fossil leaves, dinosaur bones, and silicified wood. Two flows of latite are included in the formation on South Table Mountain. This rock is grayish - brown, fine- grained, porphyrittc augite latite containing phenoerysts of augite, plagioclase, olivine, and magnetite. Cavities in latite contain zeolite minerals. Upper two - thirds is coarse - to fine- grained sandstone and mudstone consisting of quartz, abundant dark and white mica, r.° and minor feldspar; locally pebbly. Lower third is poorly :a € 400 sorted pebble conglomerate containing subrounded to d p• rounded pebbles of dark -gray chert, quartz, granite, peg- matite, and older sedimentary rocks; shows cut -and -fill structures; contains ironstone concretions. Sandstone, claystone and coal. Sandstone, light -gray to yellowish brown, silty to clayey, fine to medium - grained; composed of subangular to rounded grains of white and clear E quartz and abundant chart. Claystone and associated mica- ceous siltstone, light -gray to light olive- and pinkish -gray; to v some browish -gray and organic -rich; massive to blocky p. m structure; claystone is extensively quarried as pottery clay. v Coal in many thin seams in lower 200 ft of formation; sub - 4 '� bituminous and impure lignite. Formation contains fossil El aleaves. U Upper 105 ft is olive -gray to dark yellowish -brown shale and C ,g interbedded sandstone. Lower 75 ft is yellowish -brown ,.a massive to thin - bedded friable fine - grained locally cross - x'� 180 bedded sandstone and interbedded dark olive -gray shale and t°y n claystone. Contains large reddish -brown hard calcareous sandstone concretions about 65 ft above base. m Upper part of formation is interbedded yellowish -brown to olive -gray silty sandstone, sandy shale, and shale. Middle m part is grayish -brown clayey fine - grained sandstone of 6200 Hygiene Sandstone Member. Lower part is olive -gray to yellowish -brown shale containing ironstone and limestone concretions. Concretions contain fossils. IM a ,� E Pale -brown to reddish -brown soft thin - bedded calcareous shale 410 and interbedded thin layers of limestone. Upper part o i contains silty yellowish- orange chalk, and middle part some yellowish -gray chalk. m m r ° p °+ 3' $' Li ht ellowish- g y gray dense hard fine - grained limestone in beds Z w. w 35 1 to 7 ft thick. Contains small nodules of limonite after ,'� pyrite. Contains Inoceramus deformis. loo Dark -gray to black shale, silty claystone, sandstone, calcarenite, thin beds of bentonite, siltstone, and massive limestone. I• Upper part is chalky and silty shale and sandstone that constitute Carlile equivalent. Middle part is fossiliferous V 530 calcareous shale, calcarenite, and limestone that constitute Greenhorn equivalent. Lower part is noncalcareous black shale that contains cone -in -cone concretions and constitutes Graneros equivalent; light- to dark -gray platy siltstone in lower 15 ft is equivalent to Mowry Shale. W Tan to light yellowish -gray medium - grained crossbedded sand- stone and interbedded well- indurated siltatone and claystone. W.o a Forms a prominent hogback. South Platte Formation y a •,°; contains 4 sandstone members separated by 3 shale members. WQ Sandstone, well- sorted, porous; composed of well - rounded to fry O w o subrounded fine to medium quartz sand. Lytle Formation U S 5 u 300 contains local conglomerate or medium- to fine - grained ..1 ,° m iron- stained sandstone; conglomerate contains quartz, C q r quartzite, gray chert, limestone, and granite. Pyrite and 4 a asphaltic material abundant along shears in sandstone in r° uranium mines along Turkey Creek. Dinosaur footprints in South Platte and silicified tree trunks in upper part of Lytle. Gray and red shale and gray claystone that contain sandstone c o a and thin charophyte- bearing limestone beds. Sandstone and in 300 shale ucpermost unit of Waldschmidt and LeRoy (1944) U o are traceable into pebble conglomerate that seems to be part m W of Lytle. At base of formation, fine - grained lenticular cross - w bedded brown sandstone 7 to 31 ft thick. a tiGrayish- yellow siltstone and dull -red and greenish- yellow vari- F '� colored mudstone. Local thin lenses of dense medium -gray U.3 argillaceous lithographic limestone or yellowish -brown silt- 9 90 stone. Gypsum common in lower part south of Morrison; mudstone and fine - grained sandstone predominate north of rY Gi Morrison. Blebs and bands of chalcedony in lower 65 ft of formation form key stratigraphic horizon. ,. o Moderate reddish - brown, thin - bedded silty shale with several o thin beds of limestone. Grayish - orange -pink dense ripple- `qq m Ir marked intricately folded laminated limestone 130 ft above z W 450 base is Glennon Limestone Member of LeRoy (1946), 15 ft Wa 9S thick. Yellowish -gray thinly laminated porous limestone 75 y F ft above base is Falcon Limestone Member of LeRoy, 3 ft 7 thick. Grayish - orange to yellowish -gray or white massive medium - fine- grained friable crossbedded quartz sandstone. Twleve- Cto ft bed of conglomerate locally at top, lenses of arkosic con - m115 -200 glomerate and reddish -brown siltstone in lower part, and W o locally entire unit is conglomerate. Low -angle crossbeds p^ truncated by high -angle crombeds. Sand grains are rounded .7 frosted quartz cemented by iron or calcium carbonate. °^ a Moderate reddish -brown to yellowish -gray conglomerate, akrosic 004 sandstone, and thin layers of micaceous siltstone. Cross- es Z a rA 111 1650 bedded; cut and fill channels. Pebbles are granite, pegmatite, quartzite, quartz, feldspar, and gneiss. Resists erosion where a = cemented by iron; easily eroded where cemented by calcite. 7Z. 4 0,, W B KI Ka X00' TKd q Great Basins Petroleum 1 i Kd S D Johnson 1 Pallaoro Pallaoro (projected) a Kb Knf KnLillis P = no Ka, \\ \\ \ \Jm \ 4000' 3000' 2000' 40° 1000' SEA LEVEL 1000' 2000' \ \ \ an \\ Pei /K4 11 \ \\ Jm I I API ,{� �I -/ I I // Structure of Pierre Shale is unknown; shale is probably _ L/, i / x l/ plastically contorted Pe 2000' ��11, o KO I e / PI I PI ✓ 3000' �L It Kns rl —� Knf Kb PI 4D00 ' �� ad _� / PP1 PPI API \ ��i 5000' PI SECTION ALONG LINE B -B' ORRISON QUADRANGLE, COLORADO INt3lt Ur -THE STRATIGRAPHIC UNITS B' 7000• 105 M t Carbon KI Ka X00' TKd 5000' \ 4000' 3000' 2000' 40° 1000' SEA LEVEL 1000' 2000' 3000 ®DENVER IC O L O R A D O Pueblo 0 d .a A D A M S GOLDEN I 4' D NVE ek L+, d R_— _ —_ —_ —_ _ r` SR I rrkn ARAPAHOE INDIAN - -_ HILLS LIT .E - - - - - -- T N JEFFERSON �a No>•tA Fork DOUGLAS I ELBERT 7 yb �I I - // 63 'V 1 J MAP SHOWING MORRISON QUADRANGLE AND OTHER PLACES MENTIONED IN TEXT IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII 0016971 For sale by U.S. Geological Survey, price 50 cents