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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
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
JTRmj
TRPl
Ply
Psi
Pi
Ysp
YXp
Xbc
Xt
Xq
Xk
Xb
Xa
P f
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
eser
voir
McIntoshLake
Terr
y L
ake
Ish Res
CalkinsLake
PanamaRes No 1
Boulder
Reservoir
Valmont Res
Milton Reservoir
South
Platte
River