sign in sign up
<<
Home , Dawson Butte, Denver Basin

COLORADO GEOLOGICAL SURVEY BASIN GEOLOGIC MAPS: BEDROCK , STRUCTURE, AND ISOPACH MAPS DEPARTMENT OF NATURAL RESOURCES OF THE UPPER TO STRATA DENVER MUSEUM OF NATURE & SCIENCE BETWEEN GREELEY AND SPRINGS, COLORADO DENVER, COLORADO OVERVIEW OF DENVER BASIN STRATIGRAPHIC NOMENCLATURE FOR THE UPPERMOST CRETACEOUS AND STRATA Overview of Denver Basin Stratigraphic Nomenclature for the Uppermost Cretaceous through Upper Tertiary Strata. Plate 2 of 13 N S

Palmer Divide Tda Undifferentiated Hunt Mountain Younger Tertiary Rocks TKbs Monument uence 7000 ft D2 - Seq TKjc TKpr Table Mountain lava flows Tda Daniels Park Jimmy Camp Fan South Table Mountain Kpv Colorado Springs Green MountainGreen Mountain Paleosol Iron Horse Fan Fan TKd Monkey Face Fan lahar D2 Castle Rock 6000 ft KT-Boundary Pulpit Rock Fan Isolated Paleosols and channels D1 - Sequence South Platte River Isolated Paleosols and channels D1 - Sequence Little Wildcat Mountain Fan Wildcat Mountain Fan Arapahoe Conglomerate 5000 ft Fox Hills Pierre Ash Undifferentiated Younger Tertiary Rocks D2 Sequence Surface Geologic Units (Thorson, in press) V.E. ~ 17x Paleosol Tda Table Mountain lava flows TKd Andesitic fan deposits within D1 Sequence 4000 ft 0 5 10 km TKbs Black Squirrel Formation Mixed andesitic and arkosic fan deposits TKjc Jimmy Camp Formation Arkosic fan deposits within D1 Sequence

D1 Sequence (arkosic background) TKpr Pulpit Rock Formation Denver Basin Group Denver Arapahoe Conglomerate Kpv Pikeview Formation Laramie Formation Denver Basin Upper Cretaceous through Upper Paleogene Nomenclature Overview by Author Fox Hills Sandstone Pierre Shale Chronological order

Emmons, Cross Dane & Pierce Scott, G.R. Soister, P.E. Scott, G.R Maberry & Lindvall Maberry & Lindvall Machette, M.N. Colton, R. B. Lindvall, R. M. Lindvall, R.M. Scott et al. Tweto, O. Trimble & Machette Sharps, J.A. Bryant et al. Thorson, J.P. Thorson, J.P. Morgan et al. Thorson, J.P. Thorson, J.P. Morgan et al. Keller et al. Thorson Kellog et al. This Study and Eldridge 1936 1962 1968 1972 1972 1977 1977 1978 1978 1979 1978 1979 1979 1980 1981 2004 2004 2005 2005 2005 2005 2006 (2011) 2008 2010 1896 Denver Basin Dawson and Laramie Littleton Quad Corral Bluffs Quad Morrison Quad Parker Quad Highlands Ranch Quad Lafayette Quad Urban Fort Logan Quad Arvada Quad Pueblo Colorado Front Range Urban Limon Denver Castle Rock Cherry Valley Dawson Butte Quad Castle Rock East Half Sedalia Quad Palmer Lake Quad Southwestern Denver West Denver Basin Formations in the 30x60 Sheet Monograph 1:24,000 1:24,000 1:24,000 1:24,000 1:24,000 1:24,000 Boulder - Greeley 1:24,000 1:24,000 1x2 degree Quad 1:500,000 Colorado - Springs 1x2 degree Quad 1x2 degrees Quad South Quad School Quad 1:24,000 North Quad Larkspur Butte Quad 1:24,000 Denver Basin 1:250,000 Eastern Part of 1:24,000 1:125,000 1:100,000 1:250,000 to Castle Rock 1:250,000 1:250,000 1:24,000 1:24,000 1:24,000 1:24,000 1:50,000 1:100,000 the Denver Basin Castle Rock Conglomerate 1:100,000 AAPG Bulletin (Tcr) Castle Rock Conglomerate Wall Mtn Tuff (Twm) Castle Rock Conglomerate Castle Rock Conglomerate Castle Rock Conglomerate (Tcr) (Tcr) (Tcr) (Tcr) Conglomerate of Larkspur Butte Castle Rock Conglomerate Castle Rock Conglomerate (Tcr) Castle rock Conglomerate Ogallala Fm (To) and Catstle Rock Conglomerate White River Fm or Group (Twr) Castle Rock Conglomerate (Tcr) (Tcr) (Tcr) Wall Mtn Tuff (Twm) Undivided (Tlccru) Wall Mtn Tuff (Twm) Wall Mtn Tuff (Twm) Wall Mtn Tuff (Twm) Wall Mtn Tuff (Twm) Castle Rock Conglomerate (Tcr) Undifferentiated Castle Rock Conglomerate Castle Rock Conglomerate Wall mtn Tuff Fm (Twm) Upper Paleogene (Tcr) (Tcr) Wall mtn Tuff Fm (Twm) Wall Mtn Tuff (Twm) Wall Mtn Tuff (Twm) Wall Mtn Tuff (Twm) Conglomerate of Larkspur Butte Conglomerate of Larkspur Butte Conglomerate of Larkspur Butte Conglomerate of Larkspur Butte Conglomerate of Larkspur Butte Conglomerate of Larkspur Butte Wall Mtn Tuff (Twm) deposits White River Fm (Twr) Larkspur Conglomerate (Tlc) (Tlc) (Tlc) (Tlc) (Tlc) (Tlc) (Tlc) Tlc Green Mountain Upper part of Dawson Formation Dawson Fm Tdv Tdb Dawson Fm Facies Unit Six (Tkda6) Conglomerate Tda Tdc Tds Tdo Tdso Tdv Tds Tdo Dawson Arkose Upper Part Dawson Fm D2 Sequence Monument Fm Coarse Dawson Arkose (Tg) Tda Tdc Tdu TKda Dawson Fm Facies Unit Six (Tkda6) Dawson Fm Dawson Arkose (Tda) (Nm) Kdc Facies Unit Five Facies Unit Five Facies Unit Five Dawson Fm Dawson Fm Dawson Fm Paleosol Tde (Tkda5) Dawson Fm (Tkda5) (Tkda5) Facies Unit Five (Tkda5) Facies Unit Five (Tkda5) Facies Unit Five (Tkda5) Tdes Tdec Facies Unit Five (Tkda5) Denver Fm Upper Tongue Denver Dawson Arkose Denver Fornation (TKd) Green Mountain Tde Formation (Tkda) Basaltic Flows Dawson Fm Dawson Fm (TKd) Conglomerate (Peg) Dawson Arkose Dawson Dawson Arkose Dawson in Dawson Fm Dawson Fm Black Squirrel Facies Unit Four Facies Unit Four Facies Unit Four Formation Tda Tdc Tds Tdo Tdso Tdv Tda Tdc Tdso Tdv Denver Fm Tgm (Tkda4) (Tkda4) Facies Unit Four Table Mtn Near Golden (Tkda4) (Tkda4) (TKbs) Tt3 Denver Fm Tkd Shoshonite Tdv or lower Td Lower Dawson Arkose Denver and Arapahoe Dawson Fm Table Mountain Upper and Lower Denver and Arapahoe Fms. part of Denver Fm Dawson Formation Denver Fm Formations Denver and Arapahoe Fms. Dawson Formation Denver Formation Facies Unit Four Jimmy Camp Lava flows Tt2 flow (TKda) Dawson Arkose (Kdv) (Kd) (TKdw) (TKda) (Tkda) (TKda) (Tkd) Dawson Formation (Tkd) (Tkda4) Dawson Fm Formation(TKjc) Shoshonite Tkd - andesitic tongue of TKdl Lower Part Dawson Fm undivided Facie Unit 3 Pedb Dawson Formation Formation Dawson Dawson Fm Formation Dawson Dawson Formation Formation Dawson K-T Boundary

Dawson Fm undivided Formation Dawson Dawson Fm undivided Formation Dawson the Denver Formation Kda Tkdl (Tkdu) (Tkdu) Facies Unit Four (Tkdu) (TKDa3) Dawson Formation (TKda) Formation Dawson

Dawson Formation (TKda) Formation Dawson D1 Sequence (Tkda4) Denver

Olive Claystone Olive Claystone Olive Denver Tml

Pulpit Rock Basin Group Denver and Basin Group Denver Formation Wildcat Mountain Dawson Arkose Arkosic Sandstone Arkosic Sandstone Formation (TKpr) (TKd) fan

Variegated claystone Variegated claystone Variegated Arapahoe Dawson Fm (Tkda) Tkd Dawson Fm undivided Formations (Tkdu) Facie Unit 1 Denver Formation (TKd) Formation Denver

Conglomeratic Sandstone Conglomeratic Sandstone Conglomeratic (TKda) (TKDa1) Arapahoe (Ka) Arapahoe Fm Sandstone - light-Olive Grey - light-Olive Sandstone Arapahoe Conglomerate Sandstone - light-Olive Greay - light-Olive Sandstone (Ka) Andesitic lens Arapahoe Formation (Ka) Arapahoe Formation (Ka) Pikeview Formation (Kpv) Formation Dawson (Kda) (Ka) Upper Laramie Formation (Klu) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Lower Laramie Formation and Sandstone Claystone Olive Interbedded and Sandstone Claystone Olive Interbedded (Kll) Tdes - Denver Fm Sandstone Facies (andesite) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kfh) Tdec - Denver Fm Claystone Facies (weathreed andesite) Pierre Shale Pierre Shale Tde - Denver Fm Undifferentiated lithology Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale (Kp) (Kp) Pierre Shale (sandstone and claystone thin bedded) Kptz Pierre Shale Pierre Shale Pierre Shale (Km) (Kp,Kps, Kpt) (Kpu,Kph, Kpl) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) Montana Group

Dawson Arkose (Tdb) Td - arkosic sandstone and ss facies Tkdl - Fine Grained Sandstone Green Mtn Conglomerate (Tgm) Denver Formation (Tkd) Arapahoe Formation (Ka) Ordered by Scale first, then North to South

Basin Scale 1:250,000 Scale 1:100,000 or 1:50,000 Scale 1:24,000 Scale

Tweto, O. Emmons, Cross This Study Bryant et al. Sharps, J.A. Dane & Pierce Scott et al. Colton, R. B. Kellog et al. Trimble & Machette Thorson Machette, M.N. Lindvall, R.M. Scott, G.R Lindvall, R. M. Scott, G.R. Maberry & Lindvall Maberry & Lindvall Morgan et al. Thorson, J.P. Morgan et al. Thorson, J.P. Thorson, J.P. Thorson, J.P. Keller et al. Soister, P.E. 1979 and Eldridge 2010 1981 1980 1936 1978 1978 2008 1979 (2011) 1977 1979 1972 1978 1962 1977 1972 2005 2005 2005 2004 2005 2004 2006 1968 1896 Colorado Denver Basin Denver Basin Denver Limon Dawson and Laramie Pueblo Front Range Urban Denver West Front Range Urban Southwestern Lafayette Quad Arvada Quad Morrison Quad Fort Logan Quad Littleton Quad Highlands Ranch Quad Parker Quad Sedalia Quad Castle Rock Dawson Butte Quad Castle Rock East Half Cherry Valley Palmer Lake Quad Corral Bluffs Quad Monograph 1x2 degree Quad Formations in the 1x2 degree Quad Boulder - Greeley 30x60 Sheet Denver Basin North Quad South Quad Larkspur Butte Quad School Quad 1:500,000 1:250,000 1x2 degree Quad Colorado - Springs 1:24,000 1:24,000 1:24,000 1:24,000 1:24,000 1:24,000 1:24,000 1:24,000 1:24,000 1:24,000 1:24,000 1:125,000 1:250,000 1:250,000 Eastern Part of 1:250,000 1:100,000 1:100,000 to Castle Rock 1:50,000 1:24,000 1:24,000 1:24,000 1:24,000 the Denver Basin 1:100,000 Castle Rock Conglomerate AAPG Bulletin (Tcr) Castle Rock Conglomerate Castle Rock Conglomerate Castle Rock Conglomerate Castle Rock Conglomerate Wall Mtn Tuff (Twm) (Tcr) (Tcr) (Tcr) (Tcr) Conglomerate of Larkspur Butte Castle Rock Conglomerate Castle Rock Conglomerate (Tcr) Ogallala Fm (To) Castle rock Conglomerate and Catstle Rock Conglomerate White River Fm or Group (Twr) (Tcr) Castle Rock Conglomerate (Tcr) Castle rock Conglomerate (Tcr) Undifferentiated (Tcr) Wall Mtn Tuff (Twm) Wall Mtn Tuff (Twm) Wall Mtn Tuff (Twm) Wall Mtn Tuff (Twm) Wall Mtn Tuff (Twm) Undivided (Tlccru) Upper Paleogene Wall mtn Tuff Fm (Twm) Castle Rock Conglomerate Castle Rock Conglomerate Wall Mtn Tuff (Twm) Wall Mtn Tuff (Twm) deposits Wall Mtn Tuff (Twm) Wall mtn Tuff Fm (Twm) Wall Mtn Tuff (Twm) (Tcr) (Tcr) Conglomerate of Larkspur Butte Conglomerate of Larkspur Butte Conglomerate of Larkspur Butte Conglomerate of Larkspur Butte Conglomerate of Larkspur Butte Conglomerate of Larkspur Butte White River Fm (Twr) Larkspur Conglomerate (Tlc) Tlc (Tlc) (Tlc) (Tlc) (Tlc) (Tlc) (Tlc) Upper part of Dawson Formation Green Mountain Dawson Fm Tdb Dawson Fm Dawson Arkose Monument Fm Coarse Dawson Arkose Upper Part Conglomerate Tdo Tdv Tda Tdc Tds Tdo Tdso Tdv Facies Unit Six (Tkda6) D2 Sequence Dawson Arkose (Tda) Tds Dawson Fm Facies Unit Six (Tkda6) Tdu (Nm) Kdc TKda (Tg) Tda Tdc Dawson Fm Dawson Fm Dawson Fm Facies Unit Five Facies Unit Five Facies Unit Five Dawson Fm Dawson Fm Tde Facies Unit Five (Tkda5) (Tkda5) (Tkda5) (Tkda5) Facies Unit Five (Tkda5) Dawson Fm Facies Unit Five (Tkda5) Facies Unit Five (Tkda5) Denver Tdes Tdec Denver Fm Upper Tongue Green Mountain Denver Fornation (TKd) Dawson Arkose Formation Tde Basaltic Flows Conglomerate (Peg) (TKd) (Tkda) Dawson Fm Dawson Fm

Black Squirrel Arkose Dawson in Arkose Dawson Dawson Fm Dawson Fm Formation Facies Unit Four Facies Unit Four Facies Unit Four Denver Fm Tgm Tda Tdc Tdso Tdv Tda Tdc Tds Tdo Tdso Tdv (Tkda4) (Tkda4) Facies Unit Four Near Golden (TKd) (TKbs) Table Mtn (Tkda4) (Tkda4) Denver Fm Tt3 Table Mountain Td Shoshonite Tkd Tdv or lower Lower Dawson Arkose Denver and Arapahoe Dawson Fm part of Lava flows Denver Formation Dawson Formation Denver Fm Denver and Arapahoe Fms. Upper and Lower Denver and Arapahoe Fms. Denver Fm Formations Jimmy Camp Facies Unit Four Dawson Formation Dawson Arkose (Tkd) (Tkd) (TKda) (TKda) Tt2 flow (TKda) (Kdv) (Kd) (Tkda) Shoshonite Dawson Formation Formation (TKjc) (Tkda4) Dawson Fm (TKdw) TKdl Pedb Lower Part Tkd - andesitic tongue of Dawson Fm undivided Facie Unit 3 Dawson Formation Formation Dawson Dawson Fm Formation Dawson K-T Boundary Formation Dawson

Dawson Fm undivided Formation Dawson Dawson Fm undivided Formation Dawson Tkdl Kda the Denver Formation (Tkdu) Facies Unit Four (Tkdu) (Tkdu) (TKDa3)

D1 Sequence (TKda) Formation Dawson (Tkda4) (TKda) Formation Dawson Denver Denver Tml Pulpit Rock Denver Basin Group Denver Contact types: Olive Claystone Olive Claystone Olive and a.o.Wildcat Mountain Formation Basin Group Denver Formation(TKpr) Dawson Arkose Arapahoe fan (TKd) Arkosic Sandstone Arkosic Sandstone Dawson Fm (Tkda) Dawson Fm undivided Tkd claystone Variegated claystone Variegated Formations (Tkdu) Facie Unit 1 Arapahoe (TKd) Formation Denver (TKda) Arapahoe Fm (TKDa1) Arapahoe Arapahoe Formation (Ka) Sandstone Conglomeratic Sandstone Conglomeratic Conglomerate Andesitic lens Pikeview (Ka) Grey - light-Olive Sandstone Arapahoe Formation (Ka) Arapahoe Formation (Ka) Formation Greay - light-Olive Sandstone Dawson (Kda) (Ka) Formation (Kpv) Upper Laramie Formation (Klu) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Laramie Formation (Kl) Lower Laramie Formation Conformable contact, or not specified Interbedded Olive Claystone and Sandstone Claystone Olive Interbedded and Sandstone Claystone Olive Interbedded (Kll)

Tdes - Denver Fm Sandstone Facies Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kf) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) Fox Hills Sandstone (Kfh) (andesite) Internal contact, within formation Tdec - Denver Fm Claystone Facies Pierre Shale Pierre Shale (weathreed andesite) Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale Pierre Shale (Kp) Kptz (Kp) Tde - Denver Fm Undifferentiated lithology Pierre Shale Pierre Shale Pierre Shale (Kp) (Km) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kpu,Kph, Kpl) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp) (Kp,Kps, Kpt) Montana Group (sandstone and claystone thin bedded)

References Bryant, B., McGrew, L.W., and Wobus, R.A., 1981, Geologic map of the Denver 1 degree x 2 Lindvall, R.M., 1978, Geologic map of the Fort Logan Quadrangle, Jefferson, Denver, and Arapahoe Morgan, M.L., McHarge, J.L., and Barkmann, P.E., 2005, Geologic Map of the Sedalia Quadrangle, Thorson, J.P., 2004, Geologic Map of the Castle Rock South Quadrangle, Douglas County, Colorado: degrees Quadrangle, north-: U.S. Geological Survey, Miscellaneous Counties, Colorado: U.S. Geological Survey, Geologic Quadrangle Map GQ-1427, Douglas County, Colorado: Colorado Geological Survey, Open-File Report OF05-06, Colorado Geological Survey, Open-File Report OF04-05, scale 1:24,000. Investigations Series Map I-1163, scale 1:250,000. scale 1:24,000. scale 1:24,000. Scott, G.R., 1962, Geology of the Littleton Quadrangle, Jefferson, Douglas, and Arapahoe Counties, Thorson, J.P., 2004, Geologic Map of the Cherry Valley School Quadrangle, Elbert, Douglas, El Paso Colton, R.B., 1978, Geologic map of the Boulder-Fort Collins-Greeley area, Front Range Urban Lindvall, R.M, 1979, Geologic map of the Arvada Quadrangle, Adams, Denver, and Jefferson Counties, Colorado: U.S. Geological Survey, Bulletin 1121-L, scale 1:24,000. Counties, Colorado: Colorado Geological Survey, Open-File Report OF04-06, scale 1:24,000. Corridor, Colorado: U.S. Geological Survey, Miscellaneous Investigations Series Map Colorado: U.S. Geological Survey, Geologic Quadrangle Map GQ-1453, scale 1:24000. I-855-G, scale 1:100,000. Scott, G.R., 1972, Geologic map of the Morrison Quadrangle, Jefferson County, Colorado: U.S. Geological Thorson, J.P., 2005, Geologic Map of the Castle Rock North Quadrangle, Douglas County, Colorado: Maberry, J.O. and Lindvall, R.M., 1972, Geologic map of the Parker Quadrangle, Arapahoe and Douglas Survey, Miscellaneous Geologic Investigations Map I-790-A, scale 1:24,000. Colorado Geological Survey, Open-File Report OF05-02, scale 1:24,000. Dane, C. H., and Pierce, W. G., 1936, Dawson and Laramie Formations in southeastern part of the Counties, Colorado: U.S. Geological Survey, Miscellaneous Geologic Investigations Denver Basin, Colorado: American Association of Geologists Bulletin, v. 20, Map I-770-A, scale 1:24,000. Scott, G.R., Taylor, R.B., Epis, R.C., and Wobus, R.A., 1978a, Geologic map of the Pueblo 1 degree x 2 Thorson, J.P., 2005, Geologic Map of the East Half of the Larkspur Quadrangle, Douglas and El Paso p. 1308–1328. degrees Quadrangle, south-central Colorado: U.S. Geological Survey, Miscellaneous Investigations Counties, Colorado: Colorado Geological Survey, Open-File Report OF05-07, scale 1:24,000. Maberry, J.O. and Lindvall, R.M., 1977, Geologic map of the Highlands Ranch Quadrangle, Arapahoe Series Map I-1022, scale 1:250,000. Emmons, S.F, Cross, W., and Eldridge, G.H., 1896, Geology of the Denver Basin in Colorado: and Douglas Counties, Colorado: U.S. Geological Survey, Geologic Quadrangle Map GQ-1413, Trimble, D.E. and Machette, M.N., 1979, Geologic map of the Colorado Springs-Castle Rock area, Front U. S. Geological Survey Monograph 27, 527 pp. scale 1:24,000. Sharps, J.A., 1980, Geologic map of the Limon 1 degree x 2 degrees Quadrangle, Colorado and : Range Urban Corridor, Colorado: U.S. Geological Survey, Miscellaneous Investigations Series U.S. Geological Survey, Miscellaneous Investigations Series Map I-1250, scale 1:250,000. Map I-857-F, scale 1:100,000. Keller, J. W., Morgan, M. L., Thorson, J. P., Lindsay, N. R., and Barkmann, P.E., 2006, Geologic Machette, M.N., 1977, Geologic map of the Lafayette Quadrangle, Adams, Boulder, and Jefferson Counties, Map of the Palmer Lake Quadrangle, El Paso County, Colorado: Colorado Geological Colorado: U.S. Geological Survey, Geologic Quadrangle Map GQ-1392, scale 1:24,000. Soister, P.E., 1968, Geologic map of the Corral Bluffs Quadrangle, El Paso County, Colorado: U.S. Tweto, O., 1979, Geologic map of Colorado: U.S. Geological Survey, scale 1:500,000 Survey, Open-File Report 06-06, scale 1:24,000. Geological Survey, Geologic Quadrangle Map GQ-783, scale 1:24,000. Morgan, M.L., Temple, J., Grizzell, M.T., and Barkmann, P.E., 2005, Geologic Map of the Dawson Kellogg, K.S., Shroba, R.R., Bryant, B., and Premo, W.R., 2008, Geologic map of the Denver Butte Quadrangle, Douglas County, Colorado: Colorado Geological Survey, Open-FileReport Thorson, J.P., 2011. Geology of the Upper Cretaceous, Paleocene and Eocene strata in the southwestern West 30' x 60' quadrangle, north-central Colorado: U.S. Geological Survey, Scientific OF04-07, scale 1:24,000. Denver Basin, Colorado. Colorado Geological Survey. Investigations Map SIM-3000, scale 1:100,000.

DENVER BASIN GEOLOGIC MAPS: BEDROCK GEOLOGY, STRUCTURE, AND ISOPACH MAPS OF THE UPPER CRETACEOUS TO PALEOGENE STRATA BETWEEN GREELEY AND COLORADO SPRINGS, COLORADO

Marieke Dechesne, Robert G. Raynolds, Peter E. Barkmann and Kirk R. Johnson 2011