geologic map of the boulder—fort … · kpu kptz qrf kph qc kl ppf pi ppf tkda]pl ppf tqm kpl ppf...

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Kcg Qc J mj Qpc Qc Kfh Qc Kn af Kprl Pl Qpc Ti Qv Kptz Kph Pl Qv Qe Pl Kpm J mj Qc Qc TKda Qrf Kn Kptz Kd Kptz Kpm Qc Kpm Qs Ql Qc Kcg Qpc Pl Qc J mj Kn Pl Kpu Ply Kl Qc Kprl Qc Qc Kn Kph Qc Qc Qrf Kptz Kph Kpl Kl Ply Kcg Kpu Kn Qprf J mj Kn Kcg Qc Ti Qprf J mj Xb P f Qrf Kptz Kcg Qc Qe J mj Qe Kpm Qs Pi Kprl Qc Kcg Kcg Qv P f Qc Qv Qpp Qs Qpc Ql Qv Qs Qs Kn Psi Kcg P f Qc Qc Ysp YXp Qc Kpu Kptz Qrf Kph Qc Kl Qv P f Pi P f TKda Pl P f Tqm Kpl P f Qv Kn Qv Ply P f Kpm Qrf Qpp Qv Qs Kprl Pl Qc Qprf P f Kcg P f Qpc Xbc Pl Qs Qpp Kl Kcg Ply Kpl Kn Kprl Kl Qprf Qc ARTIFICIAL FILL POST-PINEY CREEK ALLUVIUM (UPPER HOLOCENE) TALUS (UPPER HOLOCENE TO PLEISTOCENE) COLLUVIUM (UPPER HOLOCENE TO PLEISTOCENE) EOLIUM (WINDBLOWN CLAY, SILT (LOESS), SAND, AND GRANULES) (UPPER HOLOCENE TO BULL LAKE GLACIATION) LANDSLIDE DEPOSITS (HOLOCENE TO PLEISTOCENE) PINEY CREEK ALLUVIUM (UPPER HOLOCENE) BROADWAY ALLUVIUM (PINEDALE GLACIATION, PLEISTOCENE) LOUVIERS ALLUVIUM (BULL LAKE GLACIATION, PLEISTOCENE) SLOCUM ALLUVIUM (SANGAMON INTERGLACIATION OR ILLINOIAN GLACIATION, PLEISTOCENE) VERDOS ALLUVIUM (YARMOUTH INTERGLACIATION OR KANSAN GLACIATION, PLEISTOCENE) ROCKY FLATS ALLUVIUM (AFTONIAN INTERGLACIATION OR NEBRASKAN GLACIATION, PLEISTOCENE) PRE-ROCKY FLATS ALLUVIUM (NEBRASKAN(?) GLACIATION, PLEISTOCENE) BOULDER DEPOSITS (PLIOCENE?) QUARTZ MONZONITE (EOCENE) RHYODACITE AND BASALT (PALEOCENE) DENVER (PALEOCENE AND UPPER CRETACEOUS) AND ARAPAHOE (UPPER CRETACEOUS) FORMATIONS LARAMIE FORMATION (UPPER CRETACEOUS) FOX HILLS SANDSTONE (UPPER CRETACEOUS) PIERRE SHALE, UNDIFFERENTIATED (UPPER CRETACEOUS) Upper transition member Upper shale member Richard Sandstone Member, unnamed shale member, Larimer Sandstone Member, unnamed shale member, and Rocky Ridge Sandstone Member. Middle shale member Hygiene Sandstone Member Lower shale member NIOBRARA FORMATION (UPPER CRETACEOUS) CARLILE SHALE, GREENHORN LIMESTONE AND GRANEROS SHALE DAKOTA GROUP (LOWER CRETACEOUS) MORRISON, CANYON SPRINGS MEMBER OF SUNDANCE AND JELM FORMATIONS LYKINS FORMATION (TRIASSIC AND PERMIAN) LYONS SANDSTONE (PERMIAN) SATANKA AND INGLESIDE FORMATIONS (PERMIAN) INGLESIDE FORMATION FOUNTAIN FORMATION (PERMIAN AND PENNSYLVANIAN) SILVER PLUME QUARTZ MONZONITE (PRECAMBRIAN Y) PEGMATITE (PRECAMBRIAN Y OR X) BOULDER CREEK GRANODIORITE (PRECAMBRIAN X) TONALITE (PRECAMBRIAN X) METASEDIMENTARY ROCKS (PRECAMBRIAN X) Quartzofeldspathic schist and gneiss interbedded with mica schist and gneiss Knotted mica schist Porphyroblastic biotite schist AMPHIBOLITE (PRECAMBRIAN X) CONTACT FAULT OR LINEAR FEATURE INFERRED TO BE A FAULT—Dotted where concealed U, upthrown side; D, downthrown side; crosshatched area is brecciated rock D U af Qpp Qt Qpc Qb Qlo Qs Qv Qrf Qprf Tb Tqm Ti Qc Ql Qe DESCRIPTION OF MAP UNITS TKda Kl Kfh Kptz Kpu Kprl Kpm Kph Kpl Kn Kcg Kd JT Rmj T RPl Ply Psi Pi Ysp YXp Xbc Xt Xq Xk Xb Xa P f MISCELLANEOUS INVESTIGATIONS SERIES I–855–G Version 1.1 U.S DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY GEOLOGIC MAP OF THE BOULDER—FORT COLLINS—GREELEY AREA, COLORADO By Roger B. Colton CONTOUR INTERVAL 50 METERS NATIONAL GEODETIC VERTICAL DATUM OF 1929 2002 MAGNETIC DECLINATION AT CENTER OF SHEET TRUE NORTH MAGNETIC NORTH 10° 1 10 KILOMETERS 0 1 2 4 3 5 6 7 8 9 SCALE 1: 100 000 1 8 MILES 1 0 2 3 4 5 6 7 COLORADO MAP LOCATION Universal Transverse Mercator projection, zone 13, 1927 North American Datum Geology compiled in 1976; GIS database by Theodore R. Brandt, David W. Moore, and Kyle E. Murray; Digital Cartography by Theodore R. Brandt; Edited by Alex J. Donatich 105°22'30" 105°22'30" 105°15' 105°15' 105°7'30" 105°7'30" 105°0' 105°0' 104°52'30" 104°52'30" 104°45' 104°45' 104°37'30" 104°37'30" 40°0' 40°0' 40°7'30" 40°7'30" 40°15' 40°15' 40°22'30" 40°22'30" 40°30' 40°30' 40°37'30" 40°37'30" Horsetooth Reservoir Boedecker Lake Welch Res Lonetree Res Lake Loveland Horseshoe Lake Boyd Lake Fossil Creek Res Timnath Lake Windsor Res Lower Latham Reservoir River Platte South Carter Lake Reservoir McIntosh Lake Terry Lake Ish Res Calkins Lake Panama Res No 1 Boulder Reservoir Valmont Res Milton Reservoir South Platte River

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Page 1: GEOLOGIC MAP OF THE BOULDER—FORT … · kpu kptz qrf kph qc kl ppf pi ppf tkda]pl ppf tqm kpl ppf qv kn qv ply ppf kpm qrf qpp qs kprl]pl qc qprf ppf kcg ppf qpc xbc]pl qs qpp kl

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ARTIFICIAL FILL

POST-PINEY CREEK ALLUVIUM (UPPER HOLOCENE)

TALUS (UPPER HOLOCENE TO PLEISTOCENE)

COLLUVIUM (UPPER HOLOCENE TO PLEISTOCENE)

EOLIUM (WINDBLOWN CLAY, SILT (LOESS), SAND, AND GRANULES) (UPPER HOLOCENE TO BULL LAKE GLACIATION)

LANDSLIDE DEPOSITS (HOLOCENE TO PLEISTOCENE)

PINEY CREEK ALLUVIUM (UPPER HOLOCENE)

BROADWAY ALLUVIUM (PINEDALE GLACIATION, PLEISTOCENE)

LOUVIERS ALLUVIUM (BULL LAKE GLACIATION, PLEISTOCENE)

SLOCUM ALLUVIUM (SANGAMON INTERGLACIATION OR ILLINOIAN GLACIATION, PLEISTOCENE)

VERDOS ALLUVIUM (YARMOUTH INTERGLACIATION OR KANSAN GLACIATION, PLEISTOCENE)

ROCKY FLATS ALLUVIUM (AFTONIAN INTERGLACIATION OR NEBRASKAN GLACIATION, PLEISTOCENE)

PRE-ROCKY FLATS ALLUVIUM (NEBRASKAN(?) GLACIATION, PLEISTOCENE)

BOULDER DEPOSITS (PLIOCENE?)

QUARTZ MONZONITE (EOCENE)

RHYODACITE AND BASALT (PALEOCENE)

DENVER (PALEOCENE AND UPPER CRETACEOUS) AND ARAPAHOE (UPPER CRETACEOUS) FORMATIONS

LARAMIE FORMATION (UPPER CRETACEOUS)

FOX HILLS SANDSTONE (UPPER CRETACEOUS)

PIERRE SHALE, UNDIFFERENTIATED (UPPER CRETACEOUS)

Upper transition member

Upper shale member

Richard Sandstone Member, unnamed shale member, Larimer Sandstone Member, unnamed shale member, and Rocky Ridge Sandstone Member.

Middle shale member

Hygiene Sandstone Member

Lower shale member

NIOBRARA FORMATION (UPPER CRETACEOUS)

CARLILE SHALE, GREENHORN LIMESTONE AND GRANEROS SHALE

DAKOTA GROUP (LOWER CRETACEOUS)

MORRISON, CANYON SPRINGS MEMBER OF SUNDANCE AND JELM FORMATIONS

LYKINS FORMATION (TRIASSIC AND PERMIAN)

LYONS SANDSTONE (PERMIAN)

SATANKA AND INGLESIDE FORMATIONS (PERMIAN)

INGLESIDE FORMATION

FOUNTAIN FORMATION (PERMIAN AND PENNSYLVANIAN)

SILVER PLUME QUARTZ MONZONITE (PRECAMBRIAN Y)

PEGMATITE (PRECAMBRIAN Y OR X)

BOULDER CREEK GRANODIORITE (PRECAMBRIAN X)

TONALITE (PRECAMBRIAN X)

METASEDIMENTARY ROCKS (PRECAMBRIAN X)

Quartzofeldspathic schist and gneiss interbedded with mica schist and gneiss

Knotted mica schist

Porphyroblastic biotite schist

AMPHIBOLITE (PRECAMBRIAN X)

CONTACT

FAULT OR LINEAR FEATURE INFERRED TO BE A FAULT—Dotted where concealed U, upthrown side; D, downthrown side; crosshatched area is brecciated rock

DU

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DESCRIPTION OF MAP UNITS

TKda

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MISCELLANEOUS INVESTIGATIONS SERIES I–855–GVersion 1.1

U.S DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY

GEOLOGIC MAP OF THE BOULDER—FORT COLLINS—GREELEY AREA, COLORADO By

Roger B. Colton

CONTOUR INTERVAL 50 METERS

NATIONAL GEODETIC VERTICAL DATUM OF 19292002 MAGNETIC DECLINATIONAT CENTER OF SHEET

TRU

E N

OR

TH

MA

GN

ETIC

NO

RTH

10°

1 10 KILOMETERS0 1 2 43 5 6 7 8 9

SCALE 1: 100 0001 8 MILES10 2 3 4 5 6 7

COLORADO

MAP LOCATION

Universal Transverse Mercator projection, zone 13, 1927 North American Datum Geology compiled in 1976; GIS database by Theodore R. Brandt, David W. Moore, and Kyle E. Murray;Digital Cartography by Theodore R. Brandt; Edited by Alex J. Donatich

105°22'30"

105°22'30"

105°15'

105°15'

105°7'30"

105°7'30"

105°0'

105°0'

104°52'30"

104°52'30"

104°45'

104°45'

104°37'30"

104°37'30"

40°0' 40°0'

40°7'30" 40°7'30"

40°15' 40°15'

40°22'30" 40°22'30"

40°30' 40°30'

40°37'30" 40°37'30"

Horsetooth R

eservoir

BoedeckerLake

Welch Res

Lone

tree

Res

LakeLoveland

HorseshoeLake

Boyd L

ake

Fossil Creek Res

TimnathLake

Win

dsor

Res

Lower Latham Reservoir

River

Platte

Sout

h

Car

ter

Lak

e R

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voir

McIntoshLake

Terr

y L

ake

Ish Res

CalkinsLake

PanamaRes No 1

Boulder

Reservoir

Valmont Res

Milton Reservoir

South

Platte

River