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COLORADO GEOLOGICAL SURVEY
<br />DEPARTMENT OF NATURAL RESOURCES
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<br />_4SC1 3F 4AP UNITS
<br />w.qt Pi..,°4 ryw,.t Allt,y ±em
<br />Piny Creek Alluvium
<br />Quaternary
<br />'Qp
<br />Eolian Sand
<br />r Oe]s
<br />4ro atW All uvig
<br />Q b
<br />Louviars Allvrlgs
<br />Slocum Allvvium
<br />Verdos Alluvium
<br />QV
<br />Rgcky Flats Alluvlup
<br />Nusspauw Alluvi
<br />Q fl
<br />Paleocene Raton Formation
<br />Ykr
<br />Upper Verme,lo Formation
<br />Cretaceous
<br />KV
<br />Upper Trinidad Sandstone
<br />Cretaceous
<br />Kt
<br />Upper Pierre Shale
<br />Cretaceous
<br />Kp
<br />p ^crly sorted, -,ravelly
<br />Sand about 2 -3 feet (1m) above modern
<br />drainagaa. Sourtt of excellent quali
<br />Grayish-brown, poorly sorted, silty gravel
<br />with humus. Terrace is about 20 fast ('6m)
<br />above the Arkansas River and is mapped in
<br />broad upland valleys. Weakly developed
<br />soil. Source of excelleet quality gravel.
<br />Light -brown to yellow, well- sorted,
<br />cross - bedded, non- ceyneatad sand.
<br />Moderately developed soil and unit is
<br />About 10 -20 feet (3 -6m) thick.
<br />Yellowish -brown, bouidery gravel about 40
<br />feet (12rm) above the Arkansas River. Ter-
<br />race has moderately well developed soil and
<br />is about 10 feet (3m) thick. Source of good
<br />quality gravel,
<br />Yellowish -aray, cobbly gravel, poorly sorted,
<br />poorly stratified about 80 feet (tom) above
<br />the Arkansas River. Terrace is about 20 feet
<br />(6m) thick and has a well developed soil.
<br />Good source of aggregate.
<br />Yatlowlsh -red to grayish - orange, well strati-
<br />fied, poorly sorted gravel with reworked shale.
<br />Usually covered by light brown silt or clayey
<br />sand, occurs at two terrace levels, 120 feet
<br />(36m) and 170 feet (52m), above drainages. Unit
<br />can be very poorly sorted, clay- or silt -rich.
<br />Well developed soil on units about 5 -10 feet
<br />(24m) thick.
<br />Yellowish- 'brown to grayish-broem, coarse sand
<br />and gravel, well rounded, weathered clasts. Two
<br />levels, 180 -230 feet (55 -70m) and 290 feet ()
<br />above the Arkansas River, Units about 20 feet
<br />(6m) thick with well developed soils.
<br />Reddish - brown. poorly sorted, ttr
<br />sandy ravel . Unit occurs at tare
<br />(113 m and 380 feet (127m) above
<br />River. Clasts are very weathered
<br />calcium carbonate. Gravels about
<br />thick.
<br />ratified, silty,
<br />levels, 340 feet
<br />the Arkansas
<br />and coated with
<br />20 feet (6m)
<br />Reddish brown, poorly sorted, coarse sand and peb-
<br />ble gravel on dissected pedl=wt 470 feet (143m)
<br />above the Arkansas River. Vnit is about 40 feet
<br />(13m) thick.
<br />Ttllowis. gray to brat. mod1t#&-gas aerd,
<br />hard, cross - stratified stn stone. sef8.
<br />wall- b4e3ded claystora and siltstom,
<br />pebbly sandstone and poorly sorted
<br />fluvial conglomerate; with chsrt quartz
<br />and granitic cl as is ; adeout 60 feet
<br />(260m) thick.
<br />Yellowish -gray to brown, medium- to
<br />terse- grained, cross - stratified, massive,
<br />cliff forming, van- marine sar& tone. thin
<br />beds of soft, carbonaceous shaly sand-
<br />stones; 250 -500 feet (75 -150x) th ick.
<br />Tan- to yellowish- orange, thin- to
<br />massive - bedded. fine- to coarse- grained,
<br />hard, friable, cross - stratified tar-d-
<br />storsa interladrersd with dart- to fight•
<br />sfia md bituminous blo cky ol a d ligni
<br />sandstones tre both marine and non -
<br />marine, 200 -750 stet (60 -210x) thick,
<br />hogback
<br />resistant sendstones, cliff and hock
<br />former.
<br />Light -gray to yellowish- gray, fine to
<br />medium - grained, friable, cross - stratified,
<br />massive- to thin- bedded sandstone, with
<br />carbonaceoen shale 50 -100 feet (15 -3Om)
<br />thick, cliff former.
<br />Dark -gray. olive -gray to black clayey,
<br />silty, and sandy shale, containing
<br />bentonite beds and several zones of
<br />marine fossils (Scott and Cubban, 1975);
<br />thickness varies from less than 100
<br />feet (304) to over 4000 feet (12100n) in
<br />the Canon City - Florence Basin, contains
<br />core in cone structu,Ys and li;=nitic
<br />concretions.
<br />SYMBOLS
<br />Base from U.S. 6tologicai Survey, 1"y. a:c�uw
<br />Photorevisad. 1976. ' ° ' ""
<br />Asap modified after Stott (19'T7)
<br />and W (1959) .
<br />_ONTOUR INTERVAL 20 FEET -
<br />" �ovAOO
<br />e :..W PANGLI JCATo
<br />RECONNAISSANCE- GEOLOGIC MAP OF THE 'has a ngle ,q ss re as ID r t of c '
<br />Canon „sty i l ,
<br />�uadraTagle ,vas prepared as pa�:�t or Colorado ScIaool of .fine
<br />CANON CITY QUADRANGLE -2,32 wits support of the d liminary to 5 subs F
<br />r
<br />file map 't should be considered preliminary a subs
<br />publication which will be edited and rerirafted. In a
<br />g, ��! formal' publication will include an extensive explar
<br />by B W. Beach on the the`?;.
<br />Contact - Dashed where approximately
<br />located, dotted where concealed.
<br />Fault trace - Ball on dowrthrmmr side.
<br />Dashed where approximately located,
<br />dotted where concealed.
<br />Anticline - Arrow in direction of plunge.
<br />Dotted where concealed.
<br />Syncline - Arrow in direction of plunge.
<br />Dotted where concealed.
<br />ATTITUDE OF BEDDING
<br />X46 Inci il*_d
<br />Vertical
<br />d
<br />t
<br />OPEN FILE 83-
<br />PLATE-!
<br />p �r
<br />Lee, * y 4111 rat
<br />Cretac*oo
<br />4 Kns a
<br />Upper
<br />Fort Nays Limestone
<br />r:F 7W
<br />Upper Carlile Shale
<br />Cratacaous
<br />KC
<br />Upper Greenhorn Lirnestone
<br />Cretaceous
<br />Kg h-
<br />Upper Graneros Shale
<br />Cretaceous
<br />Kg
<br />Laver Dakota Group
<br />Cretaceous
<br />f E
<br />Upper t Formatio
<br />jurassic
<br />.� Rl
<br />Upper Ralston Creek Formation
<br />Jurassic
<br />Precambrian bo Qri Ffmotion
<br />pC
<br />:^. -'�•
<br />fissile shale: chalk, and i'rxastotw ;
<br />About, S73 feat (171st) thick, 1:40 of
<br />cltaii� tede.
<br />Light -gray, fine-grained, hard, fossili-
<br />ferous limestone, ieterbodded with thin,
<br />calcareous shale; 30-40 feet (9 - 12m)
<br />thick. formerly speed Tiapas Limestone.
<br />torahs a ledge or hogback with underiying
<br />Codell Sandstone axed Juana Lopez cal-
<br />GreniLt.
<br />Juana Lopez Member, brown, fossi l i ferious
<br />calcarenite, 3 feet (lm) thick; Codell
<br />Sandstone Member, light -brown to gray.
<br />Fin* 4d ca san33tune.
<br />30 feet (10n) tA ic"; 1 0144' hill V i - a
<br />Ntntber, dark -gray to buck, fissile,
<br />ncnc,1lca*eovs shale, IM f ~?t f3f_%ri) thick;
<br />Fairport Chalky Shale mar, yellowish -
<br />tr wrt to black, fissile, ca`:caroaus
<br />shale, 100 feet ('3o") thick; vastly *on-
<br />resistant, fga°tmirup ml nor valley batty 2n
<br />the Greenhorn and Fort Bays Li stones.
<br />Bridge Creek Limestone ?der, bluish -
<br />gray, thin - bedded, dense, hard, lime-
<br />stone intArrbaridded with thick, gray,
<br />calcareous shale, 40 feet (13m) thick;
<br />Martland Shale Member, dark -gray.
<br />calcareous shale, 60 feet (gym) thick;
<br />Lincoln Limestone r, dark-gray
<br />calcareous shale and thin- 5edded Cal -
<br />carenite, 40 feet (13m) thick; lime-
<br />stones vertically jointed, unit forms
<br />a low hogback.
<br />Light- to dark -gray, argillaceous,
<br />fissile, noncalcareous shale, minor
<br />clay teats and li layers; 115
<br />feet (24m) thick, with cone in cone
<br />structures in the lower 60 fleet
<br />i•
<br />Dakota Sandstone, light -tan to yellowish -
<br />brown, fine- to medium- grained, friable,
<br />massive- to thin- bedded, cross - bedded, sand-
<br />stone; with minor shale, claystone, and con -
<br />giomerate; 80 -100 fret (2S -30m) thick, foams
<br />distinctive, massive hogback. Glencai m
<br />Shale. tan to brown, thin- tedded, fin*- to
<br />aadium- grained sandstone with gray to black,
<br />sandy, fissile shale and clay; SO .feet (Z!m)
<br />thi ck;
<br />Lytle Sandstone, white medl ug- to c24r A.
<br />trained, cross - bedded s"dst , l to
<br />and variegated clays; 40-110 feet thick.
<br />Gray, maroon, red and green sar4stc,",
<br />siltstone, lenticular limestone and
<br />shale with wince conglomerates; 300-
<br />150 feet (114 -115n) thick, commonly
<br />displays landslide deposits..
<br />Greenish -gray siltstone, ciaystone,
<br />shale and evaporits (yylpsum), artosic
<br />sandstone and conglomerate, ontly in the
<br />southwestern so area; 20 -50 feat (7 -16m)
<br />thick, ledge axed slope former with the
<br />Morrison.
<br />fed. arkosic. cr s- Oadded. conglawrote
<br />and sandstone, siltstaeue and dark roddish-
<br />browa shale, minor lenticular liatstones;
<br />10001 - 11SI feet (300-- 410z) thick, «.' .y
<br />farmer with lower section terming rasis-
<br />tant 'flat - crows.'
<br />Light -gray to white, fine - grained,
<br />dense gsrartzitas; red to gray, coassa-
<br />Srained Pikes leak granita; biotits-
<br />plegioclase -rich gneiss; dense, hard,
<br />and fractured.
<br />Gerhard, L.C., 1961, Geology of the lower Phantom Canyon
<br />area, f enont County, Colorsda : Unpvbl. M.S. Thesis,
<br />University of Kansas.
<br />Mann, C.J. , 1957, Geology of tine Chandler Syncline,
<br />Fremont County, Colorado: Uvtpubl. M.S. Thesis, I1/S
<br />University of Kansas.
<br />Scott, G.R., 1977, Roeonnaissanea geologic map of the hAy 10 2007
<br />Canon City quadrarngIs, Free t County, Colorado: Oiv min
<br />U.S.G.S. Miss. Fie d Studies Mf -392. g and safety
<br />Webs 6.D., 1959, Geology of the Canon City- Twin
<br />Mountain area, Fremont County, Colorado: UnpuCI.
<br />M.S. Thesis, University of Kansas.
<br />LEGEND
<br />fto � m rak Mine Permit Boundary
<br />DEPARTMENT OF NATURAL RESOURCES
<br />Division of Minerals and Geolo
<br />MAP 5
<br />RECONNAISSANCE
<br />GEOLOGIC MAP
<br />Northfield Mine Project
<br />Northfield Partners, LLC
<br />P.O. Box 260678
<br />Littleton, CO 8016.3-0678
<br />DATE March 2006 Revised 2/12/
<br />N
<br />0 1.aa° 2,000 3,W0 f<
<br />SCALE: i" = 2000'
<br />CANON CiTY QUADRANGLE
<br />I. `�EMONT CO.
<br />5 MCtU -E SERIHS OPOGRAPNIC)
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