Tqp Tqp Tqp Kpl Kpl Kpl cm cm Qg Qc Qc Qgo Qac Qf Je ? Tqp ° 68 65 15 53 12 17 16 50 27 29 12 22 39 16 18 20 32 10 15 22 24 18 8 20 20 16 32 56 38 23 45 44 42 24 27 20 27 24 29 17 9 23 20 55 68 39 18 12 10 8 13 12 20 18 15 18 25 23 73 14 30 15 40 12 23 43 7 10 10 2 17 19 12 21 15 30 20 23 23 30 78 58 27 30 77 22 32 23 39 32 26 40 25 37 21 27 80 20 20 34 20 27 24 40 14 29 31 20 28 24 18 20 25 22 34 26 20 27 20 37 24 41 25 35 30 40 13 35 30 28 28 31 19 26 33 21 23 15 23 39 63 15 12 34 41 40 42 52 60 54 72 33 35 43 42 42 40 80 64 42 50 45 33 30 45 55 57 62 65 64 50 53 59 44 53 35 45 10 22 55 23 47 55 62 59 76 41 80 72 75 7 66 7 7 63 80 65 60 65 60 7 61 78 62 70 72 69 87 61 72 80 87 78 33 70 52 78 77 72 60 85 50 85 65 60 54 79 72 60 75 88 75 69 82 74 80 67 20 66 37 75 69 75 65 88 48 67 76 33 50 28 25 45 33 26 38 72 32 25 22 45 48 20 30 20 7 23 56 31 15 5 42 34 22 34 38 25 81 44 LIST OF MAP UNITS af dt Qal Qw Qav Qry Qr Qf Qt Qc Qac Qls Qls (Kb) Qg Qop Qtp Qtb Qgo QTd QTgm SCALE 1:24 000 1/ 2 1 0 1 MILE 1 KILOMETER 1 .5 0 CONTOUR INTERVAL 40 FEET NATIONAL GEODETIC VERTICAL DATUM OF 1929 QTgg QTls Kpm Kps Kpl Kn Jm Kb Kd Je cm YXu YXdi YXp Xgg Xgd Xmg Xhpg Xbg Xum Artificial fill (recent) Dredge tailings (recent) Alluvium (Holocene) Wetland deposits (Holocene) Avalanche deposits (Holocene) Active rock-glacier deposits (Holocene) Travertine (Holocene) Inactive rock-glacier deposits (Holocene and upper Pleistocene) Fan deposits (Holocene and upper Pleistocene) Talus (Holocene and upper Pleistocene) Colluvium (Holocene and upper Pleistocene) Alluvium and colluvium, undivided (Holocene and upper Pleistocene) Younger landslide deposits (Holocene and upper Pleistocene) Large landslide deposit composed entirely of Benton Shale Terrace gravel (Holocene to middle Pleistocene) Pinedale outwash deposits (upper Pleistocene) Till of Pinedale glaciation (upper Pleistocene) Till of Bull Lake glaciation (middle Pleistocene) Older outwash gravel (middle or lower Pleistocene) Diamicton (middle Pleistocene to Pliocene?) Older landslide deposits (middle Pleistocene to Pliocene) Bouldery gravel of Mesa Cortina ("Buffalo placers") (middle Pleistocene to Pliocene?) Bouldery gravel of Gold Run (middle or lower Pleis- tocene to Pliocene) Quartz monzonite porphyry (Eocene) Hornblende-biotite monzonite porphyry (Eocene) Pierre Shale (Upper Cretaceous) Shale and sandstone member Kremmling Sandstone Member Lower shale member Niobrara Formation (Upper Cretaceous) Benton Shale (Upper Cretaceous) Dakota Sandstone (Lower Cretaceous) Morrison Formation (Upper Jurassic) Entrada Sandstone (Middle Jurassic) Chinle (Upper Triassic) and Maroon Formations (Lower Permian to Middle Pennsylvanian), undivided MIDDLE AND LOWER PROTEROZOIC ROCKS Middle and Lower Proterozoic rocks, undivided— Shown on cross sections only Diorite (Middle and Lower Proterozoic) Pegmatite (Middle and Lower Proterozoic) LOWER PROTEROZOIC ROCKS Routt Plutonic Suite Granitic gneiss Granodiorite Migmatite Amphibolite and hornblende-plagioclase gneiss Biotite gneiss Ultramafic rock Contact—Dashed on map where approximately located; dotted where concealed Normal fault—Dashed where approximately located; dotted where concealed. Bar and ball on downthrown side Thrust fault—Dashed where approximately located; dotted where concealed. Teeth on upper plate Strike-slip fault—Showing relative movement; dashed where approximately located Anticline or antiform—Showing trace of axial plane Syncline or synform—Showing trace of axial plane Strike and dip of beds Inclined Strike and dip of jointing Inclined Strike and dip of foliation Inclined Vertical Strike and dip of foliation and bearing and plunge of lineation—Lineation defined by aligned mineral grains, mullion structures, and small fold axes. In most cases, lineation interpreted to be stretching direction during ductile deformation Quartz vein—Commonly vuggy, showing multiple growth stages; as wide as about 5 m; locally contains sulfide minerals 60 56 31 cm 50 70 GEOLOGIC MAP OF THE FRISCO QUADRANGLE, SUMMIT COUNTY, COLORADO By Karl S. Kellogg, Paul J. Bartos, and Cindy L. Williams 2002 Qls Qt Qt Qt YXdi Xhpg Xbg Xhpg Qt Qac Xhpg Qc Qls YXu cm Je Kd Xmg Xmg Xmg Xmg Xmg Xmg Xgg Xgg Xgg Xgg Qt Qtp Jm Xhpg Xhpg Qls Kb Qtp Xgg af (Kb) Qls 8,000 9,000 10,000 11,000 12,000 13,000 FEET Tenmile Range SECTION BEND IN 14,000 8,000 9,000 10,000 11,000 12,000 13,000 FEET 14,000 E E' E E' TENMILE CREEK NORTH TENMILE CREEK Xhpg B' B 10,000 9,000 8,000 7,000 Thrust Williams Range SECTION BEND IN B' B 7,000 8,000 9,000 10,000 11,000 11,000 cm Kd Kd Jm Jm Qtb Je Je Kb cm cm cm Je Jm Jm Kb Qc Tqp Kd Kd Tqp Kb Kn Kpl Jm Kd Kpl Kps Qac Kpm Kn Kb YXu YXu YXu YXu YXu QTls Qac Qc Qc FEET FEET SNAKE RIVER ARM DILLON RESERVOIR Qtb Kd Kb YXu YXu cm cm cm cm Qtb Tqp Kd Jm Jm Je Je Qg 7,000 8,000 9,000 FEET RESERVOIR DILLON 10,000 11,000 A A' 7,000 8,000 9,000 FEET 10,000 11,000 YXu A A' C C' 7,000 7,000 8,000 8,000 9,000 9,000 10,000 10,000 11,000 11,000 C C' YXu Xgg Kd Jm cm Je Je Jm Qg Kb Kn Kpl Qc Kpm Kb Kn Kb cm Kd Jm Je Kb Kn Kd Jm cm cm YXu Qg Qac Kn Tqp Tqp Je Tqp YXu Tqp Qc cm Qc Qf QTgg Qc FEET FEET DILLON RESERVOIR SODA CREEK 8,000 9,000 FEET 10,000 11,000 8,000 9,000 FEET 10,000 11,000 ? ? ? Je Jm Kb Kd Kn Kpl YXu TR Pcm TR Pcm QTgg Tqp Tqp Qc Qc D D' Gold Run Gulch Galena Gulch D D' U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY 106°07'30" 39°30' 106°07'30" 39°37'30" Base from U.S. Geological Survey 1970 Photorevised 1987 Polyconic projection; longitude of central meridian 105.5° North American Datum of 1927; 10,000-foot grid based on Colorado coordinate system, central zone;1000-meter grid ticks, zone 13 13 / 1 2 APPROXIMATE MEAN DECLINATION, 2001 TRUE NORTH MAGNETIC NORTH Any use of trade names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey For sale by U.S. Geological Survey Information Services Box 25286, Federal Center, Denver, CO 80225 This map was produced on request, directly from digital files, on an electronic plotter. It is also available as a PDF file at http://geology.cr.usgs.gov Geology mapped 1997-98; assisted in the field by A.M. Licamelli. Sharon Smith, R.G. Kuehn, and K.S. Morgan assisted with preparation of the digital files Digital cartography layout by William E. Sowers Preparation of GIS files for map layout by Nancy Shock Manuscript approved for publication June 20, 2000 106°00' 39°30' 39°37'30" 106°30' Unconformity Intrusive contact Unconformity Unconformity Unconformity YXu YXdi Xgg Xhpg YXp Xgd Xbg Xmg Xum cm Jm Je Tmp Kpm Kps Kpl Kn Kb Kd af dt Qal Qtp Qtb Qg Qop Qgo Qw Qav Qry QTd QTls Qtr Qr Qf Qt Qc Qac Qls Holocene Pleistocene Pliocene Eocene Upper Cretaceous Upper Jurassic Middle Jurassic MIDDLE PROTEROZOIC Lower Cretaceous Upper Triassic to Middle Pennsylvanian QUATERNARY TERTIARY CRETACEOUS JURASSIC TRIASSIC TO PENNSYLVANIAN LOWER PROTEROZOIC CORRELATION OF MAP UNITS ? ? ? ? Qls (Kb) QTgm QTgg MISCELLANEOUS FIELD STUDIES MAP MF–2340 Version 1.0 Pamphlet accompanies map COLORADO Map Area 0 5 10 KM COLORA DO FRO NT RAN GE B L U E RI VE R Dillon Interstate 70 W illia m s R a n ge th ru st Blu e R iv er fr onta l f ault G or e fa ult TECTONIC LOCATION MAP Frisco Breckenridge Dillon Reservoir GORE RANGE TENMIL E R ANGE FRISCO QUADRANGLE 39°30' 39°45' 106°00' Tqp Tqp Tqp Tqp Tqp Tqp Tqp Tqp Tqp Tqp Tqp Tqp Kpl Kpl Kpl Kpl Kpl Kpl Kpl Kpl Kpl Kpl Kpl Kpl Kpl Kpl Kn Kn Kn Kn Jm Kb Kb Kd Kd Kd Kd Kd Kd Kd Kd QTgg QTgg QTgg QTgg Tqp Tqp Tqp Tqp Tqp Kb Jm Jm Tqp Tqp Kn Qal Qal dt dt dt Xgg Qg Qg Je Qac Qac Qc Tqp QTd Qc QTd QTd Qc Xbg Qac YXdi Qtb Qtb Qtp YXdi Xgg Xgg Qtp Xhpg Xgg Xhpg Qt Qt YXdi Xmg Xmg Xhpg Qt Xhpg Qls Xhpg Xmg Qt Qr Qls Qr Xgg Qt Qr Qt Qt Xbg Xhpg Xgg Xhpg Qtp QTd QTd Qtb Qc Xgg Xgg Qtb Qls Qt Kd Xhpg Jm Qac Jm Jm Jm Qc Qc Xhpg Qac Qtb Xum YXp Qc Xgg Je Xbg Xhpg Jm cm cm Xhpg Qc Qac Je Qc Qls Kpl Qal Kn Jm Kb dt Qc Qc QTgg Qac Qg Qc Qal Tqp Qg Qg Qg Qal QTgg Qac Qac Qac dt Qal Qtb Kpm Kpm Qc Qc Qac Qac Qac Kn Kn Qg Jm Je Je cm Qc Qc Qc Kn Kn Kd Qw Qal QTgg Qtb Qtp Kd Xmg Xhpg Qac Xhpg Qls Xmg Qc Xgg Xmg Xgg Qf Qt Xgg Qc Qtp Qop Qop Xgg Qtp Qop Qop Qt Xmg Qal Qls Qc af af af Xhpg Xhpg Qtp Xhpg Qop Qtp Qtb Qtp Qtp Qtp Qop Qc Qc Kpl Kn Kb Kb Kb Kn Kn Qac Kb Kb Kd Kd Kd Qc Qc Kb Kpl Qc Qg Qtb Kb Kb Kb Qc Qc Qc Kd Kd Qtb Qac Jm Kn Qc Jm Qtp Qtp Qtp Qtb QTgm QTgm Qac Qg Kd Qls Qls(Kb) Qtp Qls Qtb QTb Qac Qw Qls QTd Qtp Qav Qac QTgm Qtb Qls Kn Kn Kb Kb Jm Kd Qg af Qc Kb Kb Kd Qac Kpm Kpm Kps QTls Qf Qc Williams Range thrust Qal QTls QTls Kps Qac Qc Qc Qc Qs Kn QTls Qg Jm Qac Qac Qls Qc Qal Qg Xgg Qc Qal QTd Qac QTd Jm Kd Qf Qf Qal Qg Qc Qc Qls Qal Qal cm Qac QTls Kps Kpm Qac cm Qc Xgg Tqp Qr Qls Qr Qry Qt Qls Kn Kn Kpl Kpl Kpl Tqp Frisco Willow Lakes Dillon Vail Pass Copper Mountain 7.5' Keystone Brecken- ridge Boreas Pass Loveland Pass INDEX MAP SHOWING SURROUNDING QUADRANGLES Je Tmp Kd Jm Jm Je Kb Kpl Ka Jm Kn Kb cm cm Kd Jm Qt Kd (BOREAS PASS) (DILLON) (VAIL PASS) (KEYSTONE) 32'30" 32'30" 43 79 43 78 43 77 43 74 43 73 000m. N. 43 80 43 81` 43 82 43 83 43 85 43 86 6500 FEET 35' T. 5 S. T. 6 S. 4 14 4 13 4 12 2'30" 1 850000 FEET 4 10 4 06 4 05 4 04 000m. E. 43 77 43 76 43 75 43 74 43 73 610 000 FEET 4 04 4 05 1 830 00 FEET 4 06 4 07 4 08 4 09 2'30" 4 11 4 12 4 13 000m. E. LOVELAND PASS 12MI. GEORGETOWN 27 MI. LINCOLN 7 MI. 0.4 Mi. TO COLO. 9 DILLON 1.1 MI. 43 79 43 78 VAIL 24 MI. WHEELER JUNCTION (COLO. 91) 5MI. 43 86 000m N. 43 85 43 84 43 83 43 83 35" BRECKENRIDGE 1.2 MI. Qtr Xhpg Xhpg Xhpg Xhpg Qtr Kn af cm Qw Kb Jm Jm CONVERSION FACTORS Multiply By To obtain centimeters (cm) 0.3937 inches (in.) meters (m) 3.281 feet (ft) kilometers (km) 0.6214 miles (mi) Multiply By To obtain inches (in.) 2.54 centimeters (cm) feet (ft) 0.3048 meters (m) miles (mi) 1.609 kilometers (km) Xbg Xgd Jm COLORADO QUADRANGLE LOCATION Tqp Tqp Tmp