Douglas B. Stoeser Gregory N. Green Laurie C. Morath William D. Heran Anna B. Wilson David W. Moore Bradley S. Van Gosen 2005 version 1.0 map U.S. Geological Survey Open-File Report 2005-1351 Denver, CO U.S. Geological Survey http://pubs.usgs.gov/of/2005/1351/ Douglas B. Stoeser Gregory N. Green Laurie C. Morath William D. Heran Anna B. Wilson David W. Moore Bradley S. Van Gosen 2005 version 1.0 map U.S. Geological Survey Open-File Report 1351 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/of/2005/1351/ This open-file report presents the results of the USGS Mineral Resources Program activity to compile a national-scale geologic map database to support national and regional level projects, including mineral resource and geo- environmental assessments. The only comprehensive sources of regional- and national-scale geologic maps are state geologic maps with scales ranging from 1:100,000 to 1:1,000,000. Digital versions of these state maps form the core of what is presented here. Because no adequate geologic map exists for the state of Alaska, it is being compiled in regional blocks that also form part of this national database. It is expected that this series will completed by approximately the end of 2007. These maps and databases are being released in blocks of states or, in the case of Alaska, as compiled blocks of 1:250,000-scale quadrangles as chapters in this series. For Alaska, formal maps as well as databases are being published here, whereas for the conterminous U.S. only state databases and preview graphics are presented, because published maps for most states already exist. For Alaska these regional compilations will form the base for compiling a new geologic map of the state. As documented in Chapter A, standards for the conterminous U.S. are somewhat different than those for Alaska and Hawaii. A primary goal of this work is to develop geologic map datasets with standardized structure and attribution. The database design and standards are documented in Chapter A of this series. The intent is that contiguous databases can be merged seamlessly and without any additional effort. In addition to a common database structure, the conterminous U.S. state databases (the contiguous 48 states) have been fitted to a set of standard state boundaries so that, when states are merged, they match without slivers or overlap. No attempt has been made to reconcile differences in mapping across state boundaries. This database consists of five major Arc/Info GIS datasets for each state; - one: geologic map with formations, - two: faults (where present), - three: dikes (where present), - four: miscellaneous line features (where present), - five: miscellaneous point features (where present). 2005 publication date Complete none planned -109.25 -102.00 41.00 37.00 none geology none USA Colorado National Geologic Map Database Catalog themes, augmented 3100 - Vector 3110 - ESRI 3112 - export 1100 - Geology 1101 - General Augmented FIPS 10-4 and FIPS 6-4, version 1.0 US08 = Colorado none This database is not meant to be used or displayed at any scale other than 1:500,000. Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey. Gregory N. Green U.S. Geological Survey mailing and physical address

MS 973, USGS, Denver Federal Center

Denver CO 80225 USA 303-236-5390 ggreen@usgs.gov State Geologic Map Compilation (SGMC) activity of the National Surveys and Analysis projects of the US Geological Survey Mineral Resources Program. ARC/INFO version 8.3 ArcView 3.2 The values of the attributes ROCKTYPE1 and ROCKTYPE2 were assigned based on the information in the legends of the source maps (most of which are paper). The definitions of these values are described in the draft document Geologic Map Classification version 6.1 (Johnson and others); available at the following website: http://geology.usgs.gov/dm ) All internal polygons were checked for closure with vendor software and on hard copy plots. Overshoots and undershoots have been deleted or corrected as appropriate. Bodies of water are classified as water, and the geologic units underlying them are not included in this coverage. The geologic map was digitized from compilations ranging in scale from 1:1,000,000 to 1:100,000 and is an accurate representation of the source maps. It is intended to be used at scales ranging from 1:1,000,000 to 1:500,000. Display at significantly larger scales may produce small errors in locations of contacts or faults relative to features contained in other data sets. Accuracy of Colorado state boundary and those arcs intersecting it: The accuracy of the state boundary arcs is based on the 1:100000 scale original data used to produce this boundary. (Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, Chapter A)) Those internal arcs intersecting the state boundary were extended or shortened as needed to complete polygons, possibly creating a small amount of error. Tweto, Ogden 1979 map 5000000 paper 1985 publication date Tweto (1979) Original mapping and compilation Green, G.N. 1992 map 500000 digital map Digital geologic map of Colorado 1992 publication date CO001 Bruce R. Johnson vector digital data unpublished material 100,000 online 199808 unknown US001 Provided linework for state boundaries Bruce R. Johnson unpublished material document online; http://geology.usgs.gov/dm unknown unknown Johnson Lith Class 6.1 Classification scheme used for lithology. The purpose of this standardization is to allow all SGMC covers to be seamlessly joined without any additional effort to form regional or national level digital maps. Note that for Alaska, the state is being compiled as blocks of 1:250k quadrangles that will ultimately be used to compile a new state map. Douglas Stoeser and Ric Wilson are co-coordinators for the overall SGMC effort, with Stoeser coordinating work on the mainland states and Wilson coordinating work for Alaska and Hawaii. 2003 - 2004 G.N. Green obtained the digital geologic map of Colorado from the website: http://pubs.usgs.gov/of/ofr-92-0507/ Re-projected the coverage into the following: projection: Lambert Conformal Conic units: meters datum: NAD27 standard parallel 1: 33 0 0.000 standard parallel 2: 45 0 0.000 central meridian: -100 0 0.000 reference latitude: 0 0 0.000 false easting: 0.000 false northing: 0.000 All attributes were deleted except NAME. (Note: Attributes associated with the generation of the coverages were not deleted. PAT - shape, area, perimeter, coverage#, and coverage-id AAT - shape, fnode#, tnode#, lnode#, rnode#, length, coverage#, and coverage-id) The values from NAME where then calculated into a new field called orig_label. 20031215 The following attributes were exported from Filemaker as a comma delimited file map_symbol1 map_symbol2 unit_link reference_id unit_age rocktype1 rocktype2 The attributes were then loaded into INFO with the following structures: item name: orig_label width: 12 output: 12 type: c item name: sgmc_label width: 16 output: 16 type: c item name: unit_link width: 18 output: 18 type: c item name: source width: 6 output: 8 type: c item name: unit_age width: 60 output: 60 type: c item name: rocktype1 width: 40 output: 40 type: c item name: rocktype2 width: 40 output: 40 type: c 20031222 Once the .csv was loaded, it was joined in Arc/Info with the joinitem command. orig_label as the related item. 2004818 Once the .pat file was correct, the .aat file was addressed. The following items were added to the table: item name: arc-code width: 3 output: 3 type: i item name: arc-para1 width: 3 output: 3 type: i item name: arc-para2 width: 3 output: 3 type: i item name: source width: 6 output: 8 type: c 20040102 Arc-code was populated using the digital map source to tag the lines using the AAT line type data dictionary. Arc-para1 was populated when additional information was available such as upthrown side of a fault or angle of thrusting on a fault. Arc-para2 is a scratch field that is used mostly in Alaska. Source was populated with code that designates the source used for the linework; typically the paper map. 20040105 Vector Lambert Conformal Conic 33 45 -100.0 0 0.00000 0.00000 coordinate pair 0.01 0.01 Meters North American Datum of 1927 Clarke 1866 6378206.4 294.98 co_geol.pat Polygon attribute table for the Colorado geologic coverage. ESRI orig_label unmodified map unit symbol from source cover. Doug Stoeser Qa Modern alluvium Qg Gravels and alluviums Qgo Older gravels and alluviums Qe Eolian deposits Qeo Older eolian deposits Qd Glacial drift Qdo Older glacial drift Ql Landslide deposits Qb Basalt flows QTSa Unclassified surficial deposits and underlying Alamosa Fm in San Luis Valley QTa Ancient alluvium To Ogallala Fm Tgv Bouldery gravel on old erosion surfaces in Front Range and Never Summer Mountains Ta Arikaree Fm Twr White River Fm or Group Th Huerfano Fm Tcu Cuchara Fm Tpc Poison Canyon Fm Tdu Upper part of Dawson Arkose Tbp Browns Park Fm Tt Troublesome Fm Tnp North Park Fm Tos Oligocene sedimentary rocks Tu Uinta Fm Tb Bridger Fm Tg Green River Fm Tgp Green River Fm--Parachute Creek Member Tgl Green River Fm--Lower Part Tglm Green River Fm--Laney Member Tgt Green River Fm--Tipton Tongue Tglu Green River Fm--Luman Tongue Tglw Lower part of Green River Fm and Wasatch Fm Tw Wasatch Fm Twc Wasatch Fm--Cathedral Bluffs Tongue Twn Wasatch Fm--Niland Tongue Two Wasatch Fm (including Fort Union equivalent at base) and Ohio Creek Fm Tf Fort Union Fm Tc Coalmont Fm Tm Middle Park Fm exclusive of Windy Gap Member Td Dry Union Fm Ts Sante Fe Fm Tsp South Park Fm Tlp Los Pinos Fm Tsj San Jose Fm Te Eocene prevolcanic sedimentary rocks Tn Nacimiento Fm Tbb Basalt flows and associated tuff, breccia, and conglomerate of late-volcanic bimodal suite Tbbi Basaltic intrusive rocks related to basalt flows Tbr Rhyolitic intrusive rocks and flows of late-volcanic bimodal suite Tbrt Ash-flow tuff of late-volcanic bimodal suite Taf Ash-flow tuff of main volcanic sequence Tial Intra-ash flow andesitic lavas Tiql Intra-ash flow quartz latitic lavas Tpl Pre-ash-flow andesitic lavas, breccias, tuffs, and conglomerates Twm Wall Mountain Tuff Tv Volcanic rocks in northwestern Colorado Tui Upper Tertiary intrusive rocks Tmi Middle Tertiary intrusive rocks Tdv Basaltic flows in Denver Fm near Golden TKda Denver and Arapahoe Fms TKdl Denver Fm or lower part of Dawson Arkose TKr Raton Fm TKa Animas Fm TKec Telluride conglomerate of Eocene prevolcanic sedimentary rocks (Te) and Cimarron Ridge Fm TKi Laramide intrusive rocks Kl Laramie Fm Kf Fox Hills Sandstone Klf Laramie Fm and Fox Hills Sandstone Kvt Vermejo Fm and Trinidad Sandstone Kp Pierre Shale, undivided Kpu Pierre Shale--Upper unit Kpm Pierre Shale--Middle unit Kpl Pierre Shale--Lower unit Kn Niobrara Fm Transitional unit between Battle Spring and Wasatch Formations Kcg Carlile Shale, Greenhorn Limestone, and Graneros Shale Kc Colorado Group Kpg Pierre Shale (Kp), Niobrara (Kn), and Carlile, Greenhorn, and Graneros (Kcg) Fms, undivided Kdp Dakota Sandstone and Purgatoire Fm Kd Dakota Sandstone or Group Kln Lance Fm Kmw Windy Gap Member of Middle Park Fm Kls Lewis Shale Kmv Mesaverde Fm, undivided Kmvu Mesaverde Group or Fm--Upper part Kmvl Mesaverde Group or Fm--Lower part Kw Williams Fork Fm Ki Iles Fm Kh Hunter Canyon Fm Ksc Sego Sandstone, Buck Tongue of Mancos Shale, and Castlegate Sandstone Kmgs Mount Garfield Fm and Sego Sandstone Km Mancos Shale Kmfm Mancos Shale--Frontier Sandstone and Mowry Shale Members Kfd Frontier Sandstone and Mowry Shale Members of Mancos Shale, and Dakota Sandstone Kdb Dakota Sandstone and Burro Canyon Fm Kkf Kirtland Shale and Fruitland Fm Kpcl Pictured Cliffs Sandstone and Lewis Shale Kch Cliff House Sandstone Kmp Menefee Fm and Point Lookout Sandstone Kmj Mancos Shale--Juana Lopez Member KJdm Dakota and Morrison Fms KJdj Dakota, Burro Canyon, Morrison, and Junction Creek Fms KJdw Dakota, Burro Canyon, Morrison, and Wanakah Fms KJdr Dakota Group and Morrison And Ralston Creek Fms at mountain front between Boulder and Colorado Springs. Dakota, Purgatoire, Morrison, and Ralston Creek Fms in Canon City area KJde Dakota, Purgatoire, Morrison, Ralston Creek, and Entrada Fms in southeast. Dakota, Morrison, and Entrada Fms in central mountains. Dakota, Burro Canyon, Morrison, Wanakah, and Entrada Fms in Gunnison River area. Dakota, Morrison, Curtis, And Entrada Fms in northwest KJds Dakota, Morrison, and Sundance Fms Jm Morrison Fm Jmj Morrison Fm and Junction Creek Sandstone Jmc Morrison Fm and Curtis Fm Jmw Morrison Fm and Wanakah Fm (Junction Creek Sandstone Member at or near top; Pony Express Limestone Member at base) Jmr Morrison and Ralston Creek Fms Jme Morrison Fm and Entrada Sandstone Jms Morrison Fm and Sundance Fm Jmse Morrison Fm, Summerville Fm, and Entrada Sandstone Jmce Morrison, Curtis, and Entrada Fms Jmre Morrison, Ralston Creek, and Entrada (or Exeter) Fms Jmwe Morrison, Wanakah, and Entrada Fms JTRg Glen Canyon Sandstone JTRgc Glen Canyon Group and Chinle Fm JTRmg Morrison, Curtis, Entrada, and Glen Canyon Fms JTRmc Morrison, Entrada, and Chinle Fms TRkc Kayenta Fm, Wingate Sandstone, and Chinle Fm TRwc Wingate Sandstone and Chinle Fm TRm Moenkopi Fm TRch Chugwater Fm TRcc Chinle and Chugwater Fms TRc Chinle Fm TRd Dolores Fm TRdg Dockum Group TRPl Lykins Fm TRPs State Bridge Fm TRPll Lykins Fm and Lyons Sandstone TRPjs Jelm, Lykins, Lyons, and Satanka Fms TRPcs Chinle And State Bridge Fms TRPcp Chinle, Moenkopi, and Park City Fms TRPr Triassic and Permian rocks TRPdc Dolores Fm and Cutler Fm TRPmc Moenkopi Fm and Cutler Fm TRPAlf Lykins Lyons and Fountain Fms Pp Park City Fm Pu Upper Permian rocks, undivided Pc Cutler Fm MZ Mesozoic rocks MZPZ Mesozoic and Paleozoic rocks PPAf Fountain Fm PPAcf Casper Fm and Lower part of Fountain Fm PPAif Ingleside Fm and Fountain Fm PPAs Sangre de Cristo Fm PPAm Maroon Fm PPAw Weber Sandstone PPAwm Weber Sandstone and Maroon Fm PAm Minturn Fm and other units of Pennslyvanian age PAb Belden Fm PAmb Minturn and Belden Fms PAe Eagle Valley Fm PAee Eagle Valley Fm - evaporitic facies PAmbe Evaporitic facies of Minturn And Belden Fms in South Park and southward PAh Hermosa Fm PArh Rico and Hermosa Fms PAmr Morgan Fm and Round Valley Limestone MCA Leadville Limestone, Williams Canyon Limestone , Manitou Limestone, and Sawatch Quartzite MDO Leadville Limestone, Williams Canyon Limestone, and one or more of: Fremont Limestone, Harding Sandstone, and Manitou Limestone DOCA Williams Canyon Limestone, Manitou Limestone, and Sawatch Quartzite OCA Manitou Limestone and Sawatch Quartzite in Southern Front Range and Wet Mountains. One or more Ordovician Fms (Fremont Limestone, Harding Sandstone, and Manitou Dolomite), Dotsero Fm, Peerless Fm, and Sawatch Quartzite in west-central and south-central Colorado Or One or more Ordovician fms MD Leadville Limestone, Gilman Sandstone, Dyer Dolomite, and Parting Fm MDCA Leadville, Gilman, Dyer, Parting, and Sawatch Fms in west-central and south-central. Leadville Limestone, Ouray Limestone, Elbert Fm, and Ignacio Quartzite in far southwest. DO Parting, Fremont, and Harding Fms CAs Sawatch Quartzite Mm Madison Limestone CAl Lodore Fm MCAml Madison Limestone and Lodore Fm CAam Intrusive rocks Yu Uinta Mountain Group YXu Uncompahgre Fm Xb Biotitic gneiss, schist, and migmatite Xfh Felsic and hornblendic gneisses, either separate or interlayered Xq Quartzite, conglomerate, and interlayered mica schist Wr Red Creek Quartzite Yp Rocks of Pikes Peak Batholith (1000-m.y. age group) Yg Granitic rocks of 1400-m.y. age group Yam Alkalic and mafic rocks in small plutons, and diabase and gabbro dikes Xg Granitic rocks of 1700-m.y. age group Xm Mafic rocks of 1700-m.y. age group YXg Granitic rocks of 1400- and 1700-m.y. age groups, undivided, or, in Taylor River region, rocks with characteristics of Xg but U-Th-Pb zircon ages of Yg sgmc_label sgmc_label = orig_label + ;n where n= province number (n=0 if no province number) Doug Stoeser unit_link composite map label = ST + sgmc_label This creates a unique identifier for every unit in the CONUS (continental United States) covers. Doug Stoeser source reference to the source used Doug Stoeser CO001 Green, G.N., 1992, The Digital Geologic Map of Colorado in ARC/INFO Format: U.S. Geological Survey Open-File Report 92-0507A-O, 9 p. and 14 magnetic disks; online at http://pubs.usgs.gov/of/1992/ofr-92-0507/ unit_age The geologic age from the source map used. Doug Stoeser Quaternary geologic age Tertiary geologic age Pliocene geologic age Miocene geologic age Oligocene geologic age Eocene geologic age Paleocene geologic age Mesozoic geologic age Cretaceous geologic age Jurassic geologic age Triassic geologic age Paleozoic geologic age Permian geologic age Pennsylvanian geologic age Mississippian geologic age Devonian geologic age Ordovician geologic age Cambrian geologic age Middle Proterozoic geologic age Early Proterozoic geologic age Late Archaen geologic age rocktype1 The predominant lithology found in the formation. unit classification alluvium gravel clastic dune sand landslide conglomerate glacial drift mudstone claystone shale sandstone siltstone limestone quartzite intermediate basalt ash-flow tuff mixed clastic/volcanic rhyolite granite felsic gneiss granitoid biotite gneiss andesite quartz latite gabbro diabase water rocktype2 The second most predominant lithology in the formation. unit classification talus alluvium claystone bentonite conglomerate sandstone siltstone mudstone oil shale shale silt limestone dolostone tuff volcanic breccia basalt granodiorite felsite diorite diabase amphibolite slate quartzite schist mafic gneiss co_geol.aat Arc attribute table for Colorado geologic coverage. ESRI arc-code Unique identifier for the line feature AAT data dictionary, Appendix H 1 contact, location certain 4 normal fault, location certain 7 shoreline or riverbank 18 Internal contact 52 normal fault, concealed 94 Shear zone, certain 101 thrust fault, direction of motion undefined, location certain 124 state boundary arc-para1 Used for "decorated" lines where additional information is needed. AAT data dictionary 0 no additional information 1 for normal faults, upthrown side is to the right arc-para2 "Scratch" field used mostly in Alaska. AAT data dictionary 0 no additional information source A coded reference citation indicating source material used. AAT data dictionary CO001 Green, G.N., 1992, The Digital Geologic Map of Colorado in ARC/INFO Format: U.S. Geological Survey Open-File Report 92-0507A-O, 9 p. and 14 magnetic disks; online at http://pubs.usgs.gov/of/1992/ofr-92-0507/ US001 Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, Chapter A) Coding for polygon attributes: NAME: FEATURE: orig_label unmodified map unit symbols from source cover sgmc_label orig_label modified for standard geologic age symbols and an integer code added for province unit_link sgmc_label and a state code identifier source reference to source of data unit_age geologic age rocktype1 predominant lithology rocktype2 second most predominant lithology Coding for arc attributes: NAME: FEATURE: arc-code unique integer identifier arc-para1 used where additional information is needed arc-para2 scratch field source reference to source of data Coding for point attributes: NAME: FEATURE: point_feature name of feature on map source reference to source of data Coding for dikes (special arcs) attributes: NAME: FEATURE: orig_label unmodified map unit symbols from source cover sgmc_label orig_label modified for standard geologic age symbols and an integer code added for province arc-code unique integer identifier dike_lith general lithology dike_age geologic age source reference to source of data ESRI U.S. Geological Survey Information Services mailing and physical address

U.S. Geological Survey 507 National Center

Reston Virginia 20192 USA 1-888-ASK-USGS or 1-703-648-5953 http://www.usgs.gov/contact/ This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey (USGS) editorial standard nor with the North American stratigraphic codes. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the USGS. Although these data have been used by the USGS and have been successfully imported into data base programs, no warranty, expressed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith. This data base GIS is not meant to be used or displayed at any scale other than 1:500,000. USGS OFR 2005-1351 ARC/INFO export 8.3 Geologic units and structural features gzip and tar http://pubs.usgs.gov/of/2005/1351/ none 20041020 20041020 U.S. Geological Survey Gregory N. Green mailing and physical address

MS 973, USGS, Denver Federal Center

Denver CO 80225 USA 1-303-236-5390 ggreen@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998