COLORADO GEOLOGICAL SURVEY DENVER BASIN GEOLOGIC MAPS: BEDROCK GEOLOGY, STRUCTURE, AND ISOPACH MAPS DEPARTMENT OF NATURAL RESOURCES OF THE UPPER CRETACEOUS TO PALEOGENE STRATA DENVER MUSEUM OF NATURE & SCIENCE BETWEEN GREELEY AND COLORADO SPRINGS, COLORADO DENVER, COLORADO OVERVIEW OF DENVER BASIN STRATIGRAPHIC NOMENCLATURE FOR THE UPPERMOST CRETACEOUS AND PALEOCENE 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 North Table Mountain 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 Laramie Formation 5000 ft Fox Hills Sandstone Pierre Ash Undifferentiated Younger Tertiary Rocks D2 Sequence Surface Geologic Units (Thorson, in press) V.E. ~ 17x Pierre Shale Paleosol Tda Dawson Arkose Table Mountain lava flows TKd Denver Formation 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 Front Range 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 Arapahoe Formation (Ka) Arapahoe Fm Sandstone - light-Olive Grey - light-Olive Sandstone Arapahoe Conglomerate Sandstone - light-Olive Greay Sandstone - light-Olive (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