9342

• UCREFRP Catalog Number: 9342
• Author: Wynn, K. H., N. J. Bauch and N. E. Driver.
• Title: Gore Creek Watershed, Colorado--Assessment of Historical and Current Water Quantitiy, Water Quality, and Aquatic Ecology, 1968-98.
• USFW Year: 2001.
• USFW - Doc Type: Denver.
• Copyright Material: NO

The geology of the Gore Creek watershed
varies from older Precambrian-age basement rocks
to Quaternary-age alluvial deposits (Jig. 3). The
Precambrian rocks. which are predominantly igneous
with some metamorphics. fonn the mountains in the
northem and eastern parts of the watershed. The head-
waters area of Gore Creek consist~ of predominantly
igneous rocks. Fractured Precambrian rocks generally

yield small quantities of water that are adequate only for
domestic supplies. Where the Precambrian rocks are frac-
tured. water may discharge from springs. Water from
these rocks is suitable for all uses (Voegeli. 1965).
Sedimentary rocks of pre-Pennsylvanian Paleozoic.
Pennsylvanian. and Pennian age crop out in the southern
and western parts of the water~hed. Rocks in the Black
Gore Creek watershed are predominantly sedimentary.

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EXPLANATIO:>i
UNCONSOLIDATED SURFICIAL DEPOSITS AND
ROCKS OF QUATERNARY AGE
GRAVEL AND AlLUVIUM (PINEDALE AND
BULL LAKE AGE)-Indudes Broadway and Lou\'iers Alluviums
GLACIAL DRIFT OF PI~EDALE AND BULL LAKE GlAClATIQ!\"S-
Includes ).Orne unclassified glacial deposils
OLDER GLACIAL DRIFT (PRE-BULL LAKE AGE)
LANDSLIDE DEPOSITS-Locally includes talus. rock-glacier. and
thick colluvial depo,il'
Ar-;'C1EST ALLUVIUM-In isolated palches that may nOl all be of
the !>ameage
SEDI~1ENTARY ROCKS OF PERMIAN A:\'D PE~~SYLVA;.llA!\ AGE
MAROON FORMATIOJ\"-Arkosic sandslon.... sihstone. conglomerate.
and locallimeslone

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SEDIME;.lTARY ROCKS OF PENNSYLVANIAf\ AGE

MI~TUR:'Il FORMATION IN WEST-CENTRAL Af\D SOUTH-CENTRAL
COLORADO AI'D aTHER Ul\rrS OF MIDDLE PE:-JNSYLVA~IAf\
AGE-Arkosic <,aoostune. eOflgJomerale. shale. and limestone

BlaTlllC Gf\EISS. SCHIST. A1'\D \t1G\1ATITE-I..<x:allv contains minor
hornblende gneiss. calc-silicate rock. quartzite. and marble. Derived
principally from sedimentary r(K."h

IGNEOUS ROCKS

GRA1\"ITIC ROCKS OF 1.7OQ-r-.1.y. AGE GROUP (1.650-1.7.30 \.ULLlON YEARS)--.
Indudc:s Bakers Bridge. Bro","-ns Pass. Powdcrhom. and Tcnmile Granites;
Boulder Creek, Denny Creek. Kroenke. and Pill" I\lcmlow Granodiorite,:
ero,s Creek Quartz Montnnites; and unnamed granitic rocks

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SEDlI\IENTARY ROCKS OF PRE.PEl\l'\SYLVAl'\IAN AGE
META\tORPHIC ROCKS Or PRECAMBRIAN AGE

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Figure 3. Geology of the Gore Creek watershed.

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6 Gore Creek Watershed, Colorado-Assessment of Historical and Current Water Quantity. Water Quality,
and Aquatic Ecology, 1968-98