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<br />DESCRIPTION OF MAP UNITS <br />[For this map the base of the Miocene is placed at 29 million yearsl <br />'. of `;--~ ARTIFICIAL FILL iHOLOCENE)-Mill tailings, slag. and quarry waste at <br />Colorado Springs and along Arkansas River <br />Qf FAN ALLUVIUM (HOLOCENE)-Bouldery. poorly suited, crudely stratr- <br />fied, steeply sloping alluvium along mountain fronts <br />Qba BASIN-FILL ALLUVIUM (HOLOCENE)-Sulfate-rich clayey to sandy al- <br />luvium in Sort Luis Valley <br />Qal ALLUVIUM (HOLOCENE) <br />QPD Post-Piney Creek alluvium-Sandy to g;cruelly alluvium along all <br />large screams: not shown where bedrock contacts are closely spaced <br />Qp Piney Creek Alluvium-Silty to gravelly humus~rith alluvium along <br />all valleys <br />Qrg 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 />Qt COLLWIUM (HOLOCENE AND PLEISTOCENE(-Nonsoned, non- <br />stratified, coarse-gained slopewash in mountains and a Hne-grained <br />deposit on plains. In southeastern part of quads ogle includes some <br />loess and residuum <br />'•;,Qls;': ;;: LANDSLIDE DEPOSIT (HOLOCENE AND PLEISTOCENE(-Earth- <br />flows and debits slides on steep slopes <br />Qtr TRAVERTINE (HOLOCENE AND PLEISTOCENE(-Includes calcareous <br />.. tUfa along and south of Arkansas River <br />:~~ Qes~ ~. ~.:: EOLIAN SAND (HOLOCENE AND PINEDALE GLACIATION OF THE <br />PLEISTOCENE)-Fine to coarse, windblown sand <br />Qlo LOESS (HOLOCENE AND PINEDALE GLACIATION OF THE PLEISTO- <br />CENE)-Windblown Clayey silt easy of Fountain Creek near Fountain <br />PINEDALE GLACIATION (PLEISTOCENE): <br />Qpf Fan alluvium-Thick gravelly deposits, in part ounvash, chiefly in San <br />Luis Valley and upstream from Elevenmile Canyon <br />Qb Broadway Alluvium-Thin gravelly deposits on terraces 40 feet (12 m) <br />above streams on the plains <br />Qpo Oulwash-Gravelly deposits along east flank of Sangre de Cristo Range <br />and around Pikes Peak <br />~Qpt~: ~.~ ~.. Till-Terminal and lateral moraines of glaciers in the Sangre de Crisco <br />Range and around Pikes Peak <br />BULL LAKE GLACIATION fPLE15TOCENEI: <br />~~~'~Qbf~::'~: ~ Fan afluvium-Thick gravelly deposits, in pan outwash, chiefly in San <br />Luis Valley and upstream from Elevenmile Canyon <br />~~.~:.~Ql.:~: ~, ~:~~ Louviers Alluvium-Thin gravelly deposits on terraces 70 feet (21 m) <br />,....~~ ~ ~..~~. above streams on the plains <br />~~ bo ~,: ~~..~ Ouhvash-Gravelly deposits at two levek abng e.•n (lank of 5an0re <br />~~ Q' de Cristo Range and at one level north of Pikes Peak <br />~~ .Qlit ~: ~~~~. ~ Till-Terminal and lateral moraines o! glaciers in tFa Sangre de Cris[o <br />Range and around Pikes Peak <br />PRE-BULL LAKE GLACIATION (PLEISTOCENEi: <br />Qpbf ~~ Fan alluvium-Pebbly gravel near Villa Grove <br />Qs Sltxum Alluvium (Sangamon Interglaciaiion or Illinoian Glanadonl- <br />Weathered gravel on cut surface about (1X1 feet (30 m) above modern <br />streams. Near Canon Ciry gravel lies ai two Ieveis,]OOIQs,land 120 <br />(Qs,l feet 130 and 36 ml. above streams <br />Qpb . ~ Alluvium-Includes Slaum(?) and Verdos('I Alluviums <br />Qpbo Outwash-Bouldery gravel <br />Qpbf Till-Nonsoned. deeply weathered. bouldery depost on east flank of <br />Sangre de Cnsto Range <br />Qrol ROCKFALL DEPOSIT (YARMOUTH? INTERGLACIATION OF THE <br />PLEISTOCENE)-Bouldery deposit on east flank of Cheyenne <br />Mountain, southwest of Colorado Spnngz <br />VERDOS ALLUVIUM (YARMOUIN. PITERGLACIATION OR KANSAN <br />GLACIATION OF THE PLEISTOCENE(-Weathered gravel on cut <br />sudace 200.250 feet 160.75 m) above modem streams except near <br />WestdiHe where rt is only 20 feet 16 ml above Grope Creek. Near <br />Canon Ciry gravel lies at two levels 240 (Qv,l and 3001Qv,lfeet (72 <br />and 90 m), above screams. Contains Pearlene ash bed type O in <br />Twelvemile Park and near Westcli H¢ <br />Qrf ROCKY FLATS ALLUVIUM fAFTONIAN INTERGLACIATION OR <br /> <br />T~y.r~;, <br />Tf <br />Tm <br />Trg <br />Tito <br />nn <br />Tm( ". <br />Tdh <br />TUFF AND TUFF BRECCIA (OLIGOCENE(-B~ <br />cull and pyrodastic breccia near Gulley <br />FLORISSANT LAKE BEDS IOLIGOCENEI-This <br />andesitic ash and volcanidastic rocks less than <br />RHYOLITE AT BEN WEST HILL (OLIGOCENE(-I <br />WestcliHe <br />QUARTZ LATITE AT BEN W EST HILL (OLIGOCEP <br />near WestdiHe <br />RfTO ALTO STOCK (OLIGOCENE(-East of Vrlle <br />Cristo Range <br />Rhyobte-Leucocratic dikes and small Intrusive m <br />Granite-Coarsely porphyrinc, pink to gray, small <br />Tonalite-Medium-grained clinopyroxene-hornb~ <br />the main rock in stock <br />BIOTITE LATITE (OLIGOCENE)-Flows and Hssur <br />phyddc biotite lance near Cotopaxi and Hillside <br />LAHARfOLIGOCENE(-Bouldery, andesitic to rhyo' <br />Cotopaxi <br />DEVILS HOLE FORMATION IOLIGOCENEI-F <br />luvium, a'u-fall and water-laid ash: N part dep <br />near Rosita <br />Ash-Slav tuff-Biotite-sanidine rhyolite NH <br />T <br />Tdp <br />Tcr <br />7tb <br />Ttha' <br />Tabs <br />Ttc <br />Twm <br />Tsp <br />Tpc <br />TKd <br />Kda <br />TIv <br />i <br />TKpr <br />Kv <br />- Kt- <br />DEER PEAK VOLCANICS fOLGGOCENE)-Stock. a <br />and volcanic sediments from the Deer Peak ~ <br />1.500 feet 1450 m) thick bertueen Rositn and D~ <br />CASTLE ROCK~CONGLOMERATE (OLIGOCENE <br />glomerate about 30 feet (9 ml thick composed la <br />Mountain Tuff. Exposed only in northeastern i <br />BASALT (OLIGOCENE(-Black dense flows from <br />Mountain uolwnic center south of GnHey <br />HORNBLENDE ANDESITE IOLIGOCENEI-Gray <br />ntic domes and domal lavas of Thirtyone Mile Mot <br />south of Gu(fey <br />BIOTITE ANDESFfE (OLIGOCENE)-Gray porphyrt <br />and domal lavas of East and West Antelope Mour <br />TALLAHASSEE CREEK CONGLOb1ERATE (OL <br />sorted. bouldery, volcanic conglomerate more tt+ <br />thick in paleovalleys <br />WALL MOUNFAIN TUFF (OLIGOCENE(-Biontz <br />rhyoGte ash-flow to H. As much as 2001¢et (61 <br />ECHO PARK ALLUVIUM (EOCENE)-Poorly sonz <br />conglomerate more than 1,000 feet (300 ml <br />and grabens <br />LATITE PORPHYRY (EOCENE?I-Intruded along <br />southwest of Antero Reservoir <br />SOUTH PARK FORMATION (PALEOCENE(-And <br />sandstone, siltstone, and daystone <br />POISON CANYON FORMATION IPALEOCENE~ <br />sandstone, and in lower part conglomerate. I <br />Probably totaling 500.1,000 feet (150.300 ml t <br />DAWSON FORMATION (PALEOCENE AND UPPEF. <br />Arkosit and andesitic coarse-Grained sandstone. <br />stone about 1,$00 feet 1540 m) (hick. Coniaim <br />mixed-rock lens near middle of Dawson, but not <br />extending between Kenle Creek and Corral BIuN <br />rado Springs <br />Andesincfens-Conglomerate, sandstone. sJtstone. , <br />165 feet (55 m) thick at the base of Dawson <br />RATON FORMATION (PALEOCENE AND UPPER <br />Ceti-forming sandstone probably less than SOU <br />POISON CANYON AND RATON FORMATIONS <br />VERMEJO FORMATION (UPPER CRETACEOUS(-C <br />stone interlayered with shale and coal about 850 <br />Rockvale Sandstone Member lies 150.375 feet <br />base <br />TRINIDAD SANDSTONE (UPPER CRETACEOUS <br />sandstone. massive in upper part and thin be: <br />