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Qf <br />Qba <br />Qal <br />QPP <br />QP <br />' Qrg <br />t Qc <br />-..Qls: ~~•:.~ <br />QV <br />~~~Qed. ~.: ~... <br />Qlo <br />DESCRIPTION OF hL4P UNITS <br />[For this map the base of the Miocene is placed at 29 million years) <br />ARTIFICIAL FILL (HOLOC6VE)-Mt11 railings, slag. and quany waste at <br />Colorado Springs and along Arkansas River <br />FAN ALLUVIUM (HOLOCENE)-Bouldery, poorly weed, crudely strad- <br />fied, steeply sloping alluvium along mountain fronts <br />BASIN-FILL ALLUVIUM (HOLOCENE)-Sulfate-rich clayey to sandy al- <br />luvium in San Luis Valley <br />ALLUVIUM (HOLOCENE) <br />Post-Piney Creek alluvium-Sandy to gravelly alluvium along all <br />large streams: not shown where bedrock conracr are closely spaced <br />Piney Creek Alluvium-Silty to gravelly humus-rich alluvium along <br />all valleys <br />ROCK GLACIER (HOLOCENE TO PINEDALE GLACIATION OF THE <br />PLEISTOCENE)-Blocks of rock in Flow sheets in valleys above <br />10.000 feet (3.000 ml altitude <br />COLLUVIUM (HOLOCENE AND PLEISTOCENE)-Nonsotted. non- <br />stradfied, coarse-grained slopewash in mounmins and afine-grained <br />deposit on plains. In southeastern part of quadrangle includes some <br />Icess and residuum <br />LANDSLIDE DEPOSIT (HOLOCENE AND PLEISTOCENEI-Earth- <br />Hows and debris slides on steep slopes <br />TRAVERTINE (HOLOCENE AND PLEISTOCENE)-Includes calcareous <br />lu(a along and south of Arkansas River <br />EOLIAN SAND (HOLOCENE AND PINEDALE GLACIATION OF THE <br />PLEISTOCENE(-Fine to coarse, windblown sand <br />LOESS I HOLOCENE AND PINEDALE GCACIAT(ON OF THE PLEISTO• <br />CENEI-Windblown clayey silt east of Founrain Creek near Founmin <br />PINEDALE GLACIATION (PLEISTOCENE): <br />Fan alluvium-Thick gravelly deposits, in part outwash, chtefiy in San <br />Luis Valley and upstream from Elevenmile Canyon <br />Broadway Alluvium-Thin gravelly deposits on terraces 40 feet (12 m) <br />above sneams on the plains <br />Outwash-Gravelly deposits along east Flank of Sangre de Cristo Range <br />and around Pikes Peak <br />Till-Terminal and lateral moraines of glaciers in the Sangre de Crisco <br />Range and around Pikes Peak . <br />BULL LAKE GLACIATION (PLEISTOCENE(: <br />Fan alluvium-Thick gravelly deposits, in part ouri,ash, chiefly in San <br />Luis Valley and upsneam from Elev¢nmile Canyon <br />Louviers Alluvium-Thin gravely deposits on terraces 70 feet (21 m) <br />above streams on the plains <br />Outwash~iravelly deposits at two 1¢v¢Ls abng e•* Hank of Sangre <br />de Cristo Range and atone level notth of Pikes {'¢ak <br />Till-Terminal and lateral moraines of glaciers in the Sangre de Cristo <br />Range and around Pikes Peak <br />PRE-BULL LAKE GLACIATION IPLEISTOCENEI: <br />Fan alluvium-Pebbly gravel near Villa Grove <br />QpE <br />Qb <br />QPo <br />~.Qp~ ~;..~.~. <br />: ~: Qbo: ~':.~. <br />~..Qbt ~~~ ~..: <br />Qpbf .. <br />Qs: <br />Qpb <br />Qpbo <br />~ QPl)I <br />~ Qrof <br />' Qv <br />I Qd <br /> <br />Slocum Alluvium (Sangamon lnterglacianon or Ilkitoian Glaciadon)- <br />Weathered gravel on cut surface about ILO feet (30 ml above modern <br />streams. Near Canon Ciry gravel lies at two levels. 100 (Qs,)and 120 <br />(Qs,l feet 130 and 36 ml. above streams <br />AAuvium-Includes Slocuml'I and Verdos!') Alluvwmi <br />Our-va sh-Bouldery gravel <br />Tdl-Nonsorted. deeply weathered. boulden,~ depose on east Hank of <br />Sangre de Cnsro Ranga <br />ROCKFALL DEPOSIT (YA R`-IOUTH~ INTERGLACIATION OF THE <br />PLEISTOCENE(-Boulday deposit on ea, flank of Cheyenne <br />Mountain. iouthwest of Colorado Springs <br />VERDOS ALLUVIUM IYARMOIJfH LVTERGL4CIA?ION OR K.-~.VSA~ <br />GLACIATION OF THE PLEISTOC ESE(-Weathered gravel on cut <br />surface ?Ol}-?50 feet 166-~.i m) above modem screams esc¢pt near <br />Westdi He whre it i; only 20 foe! Id ml above Grape Creek Near <br />Canon City gravel lies at two leveh. 2401Qv,1 and 300(Qv,l feet 172 <br />and 90 m), above streams Contains P¢arlene ash bed ryp¢ O in <br />Twelvemile Park and near Westc4H¢ <br />ROCKY FLATS ALLUVIUM( IAFTONIAN INTERGLACIATION OR <br />.~c.,,. ,,-...- ,... _..-~- -~ - - - <br />C~ <br />,~ <br />~~'-:':i <br />Tf <br />TR <br />Ttg <br />Tito <br />T1h <br />Tmf <br />Tdh <br />TUFF AND TUFF BRECCIA (OLIGOCENE)-B~ <br />full and pyroclastic breccia near Gulley <br />FLORISSANT LAKE BEDS (OLIGOCENE)-Thu <br />andesitic ash and volcanidastic rocks fens than <br />RHYOLITE AT BEN WEST HILL (OLIGOCENE(-. <br />WestcGffe <br />QUARTZ IATITE AT BEN W EST HILL (OLIGOCE; <br />near WeStcliHe <br />RlTO ALTO STOCK IOL(GOCENE)-East of Vill. <br />Cristo Range <br />RhyoGte-Leucocratic dikes and small intrusive R <br />Granite-Coarsely porphyridc. pink to gray, smal <br />Tonalite-Medium-grained clinopycoxene-hornb <br />the main rock in stock <br />BIOTITE LATITE (OLIGOCENE)-Flows and fissw <br />phyrinc bio[ite ratite near Cotopaxi and Hillside <br />LAHAR 40LIGOCENEI-Bouldery. andesidc to rhyo <br />Cotopaxi <br />DEVILS HOLE FORMATION (OLIGOCENE)-F <br />luvium, a"v-fall and water-laid ash: in pan dep <br />near Rosita <br />Ash-Flow tuff-Bfodte-sanidine rhyotite full <br />.u <br />Tdp <br />Tcr <br />Ttha' <br />Taba <br />Ttc <br />Twm '~ <br />Tsp <br />Tpc <br />Ti hd <br />Kda I <br />TKr , <br />TKpr <br />i <br />DEER PEAK VOLCACIICS (OLIGOCENE)--Stock, a <br />and volcanic sediments from the Deer Peak <br />1.500 feet (450 ml thick between Rosim and D <br />CASTLE ROCK CONGLOMERATE (OLIGOCENE <br />glomerate about 30 feet l9 m) thick composed la <br />Mountain Tuff. Exposed only in nonheastem I <br />BASALT (OLIGOCENE(-Black dense flows from. <br />Mountain wlcanic center south of Gulley <br />HORNBLENDE ANDESITE (OLIGOCENE)-Gray <br />Writ domes and domal Iavas of Thirryone h[ile htot <br />south of GuL(ey <br />BIOTITE ANDESITE (OLIGOCENE(-Gray porphyri <br />and domal lavas of East and West Antelope Mour <br />TALLAHASSEE CREEK CONGLOMERATE (OL <br />coned, bouldery, volcanic conglomerate more rh <br />thick in paleovalleys <br />WALL MOUNTAIN TUFF {OLIGOCENE)-Blodte <br />rhyotite ash-flow full. Ps much as 200 feet (6l <br />ECHO PARK ALLWIUM (EOCENE(-Poorly sorte <br />conglomerate more [han 1,000 feet (300 ml : <br />and grabens <br />LATITE PORPHYRY (EOCENE?)-Intruded along <br />southwest of Antero Reservoir <br />SOUTH PARK FORh1AT10N (pALEOCEVE)-And <br />sandstone, siltstone, and claystone <br />POISON CANYON FORMATION (PALEOCENE <br />Sandstone. and in lower parr conglom¢ra;e. <br />Probably totaling 500-L000 (eet (150300 m) t <br />DAlb50N FORMATION (PALEOCENE AND UPPEE <br />.A&osic and and¢sinc coarse~grmned sandstone <br />crone about 1.800 feet (540 m) thick. Contains <br />mired-rock lens near middle of Dawson, but not <br />extending between Kettle Creek and Coital Blvt <br />rado Springs <br />Andesinc lens-Conglomerate. sandstone. sdt;rone. <br />135 feet 135 m) thick at the base of Dawwn <br />RATON FORbIAT10N (PALEOCENE .YVD UPPEF <br />CLibforming sandstone probably Iev than SUt. <br />POISON' C.A.V1'ON ANO RATON FORMAYIO~iS <br />Kv I VERMEJOFOR~IATIONIUPPERCRETACEQUSI- <br />s:one interlayered u3h shale and coal abou[ a5 <br />Rockvale Sandstone hkmbr. lies li0.3%S Iae <br />base <br />'~ TRINIDAD SANDSTOSE (UPPER CRETACEOI <br />err:,,,,,o ~,.~....- ~ -~-- -- <br />