GENERALIZED SURFICIAL GEOLOGIC MAP OF THE PUEBLO 1˚ x 2˚ QUADRANGLE, COLORADOCompiled by

David W. Moore, Arthur W. Straub, Margaret E. Berry, Michael L. Baker, and Theodore R. Brandt2002

MISCELLANEOUS FIELD STUDIES MAP MF-2388Version 1.0

Pamphlet accompanies map

Base from U.S. Geological Survey, 1989

Transverse Mercator Projection

100 000-foot grid ticks based on Colorado coordinate system, central and south zones

Gray numbered lines indicate the 100,000-meter UniversalTransverse Mercator grid, zone 13

Compiled during 1997-1999D.W. Moore, CoordinatorDigital Cartography by T.R. Brandt and M.L. BakerManuscript approved for publication April 30, 2002

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

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pga

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afa

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elb

cac cbv

ccd ccm clo csk cgg cgh cgc cbh cbm cbs cbu cbw

cra

xch

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xsg

R

Holocene

latePleistocene

middlePleistocene

earlyPleistocene

MAN-MADEDEPOSITS ALLUVIAL DEPOSITS

EOLIAN DEPOSITS COLLUVIAL DEPOSITS

DISINTEGRATIONRESIDUUM

BEDROCK

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CORRELATION OF MAP UNITS

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tbk

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LAKEDEPOSIT

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LANDSLIDEDEPOSITS

COLLUVIUM,ALLUVIUM,

ANDROCK OUTCROP

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asa

afb

QUATERNARY

PRE-QUATERNARY

GLACIAL ANDPERIGLACIAL

DISINTEGRATEDDEPOSITS AND

ROCK OUTCROP

gge

ggq

f Artificial landfill

Slags

afa Alluvial-fan deposit

cac Arkosic loamy colluvium and sheetwash alluvium

cbv Metamorphic and metavolcanic blocky colluvium

xch Clayey, calcareous disintegration residuum

HOLOCENE

HOLOCENE AND LATE PLEISTOCENE

dba

Disintegrated deposits, periglacial deposits, bouldery till, and rock outcrop

Crystalline-clast deposits

Sedimentary-clast depositsdbc

dbd Mixed-lithology-clast deposits

asa Alluvial sand, silt, clay, and gravel (post-Piney Creek alluvium, Piney Creek Alluvium, and pre-Piney Creek alluvium of Hunt, 1954,and Scott, 1960; Broadway Alluvium)

es Eolian sand

ed Stabilized dune sand

jea Slump-block landslide deposits, earthflow and mudflow deposits

ccd Calcareous clayey colluvium

cck Tuff-clast loam and clay loam colluvium

csm Tuffaceous colluvium

csk Grus, crystalline-clast colluvium, alluvium, and rock outcrop

cgg Sandstone-clast sandy loam to clay loam colluvium

cgh Arkosic-clast loamy colluvium

cgc Gneiss- and granite-clast gravelly colluvium

cbh Blocky sedimentary-rock colluvium

cbm Carbonate-clast loamy colluvium

cbs Rhyolite- and andesite-clast colluvium

cbu Mixed-lithology blocky colluvium

cbw Blocky basalt- and andesite-clast colluvium

Sandy clay disintegration residuumxci

Limestone-chip loamy disintegration residuumxlh

xlu Feldspathic loamy disintegration residuum

HOLOCENE TO MIDDLE PLEISTOCENE

Bouldery volcanic-rock landslide depositjba

Bouldery crystalline-rock landslide depositjbc

Feldspathic quartz-sand disintegration residuumxsg

elb

LATE PLEISTOCENE

Loess (Peoria Formation)

LATE AND MIDDLE PLEISTOCENE

tbg Crystalline-clast bouldery till

tbi Sedimentary-clast bouldery till

tbj Mixed-lithology-clast bouldery till

ggq Outwash sand and gravel (of Bull Lake, Pinedale,and post-Pinedale ages)

agsAlluvial sand, silt, clay, and gravel (Louviers and Slocum

Alluviums, undivided; late middle Pleistocene)

afb Alluvial-fan gravelly loam

tbk

MIDDLE AND EARLY PLEISTOCENE

Bouldery till (of pre-Bull Lake glaciations)

gge Outwash sand and gravel (of pre-Bull Lake glaciations)

agm Alluvial gravel and sand (Verdos and Rocky Flats Alluviums, undivided;early middle Pleistocene and early Pleistocene)

afk Alluvial-fan gravelly loam

Loamy or clayey sheetwash alluviumwla

Playa clay

Eolian sheet sand and loess (included in the "cover sand" of Frye and Leonard, 1957, and Blackwater Draw Formation of Reeves, 1976, described byHoliday, 1989)

oc

esa

Andesitic clayey colluvium

Clay loam colluviumclx

ccm

[For map uni t descr ipt ions and references see "Descr ipt ion of Map Units" in accompanying pamphlet]

LIST OF MAP UNITS

Bouldery till (of Pinedale and Bull Lake glaciations)

Blocky feldspathic-sandstone colluvium

Silty loam disintegration residuum

Shale-, chalk-, and chalky-limestone-clast loamy colluvium

cby

xlj

clo

Any use of trade names in this publ icat ion is fordescr ipt ive purposes only and does not imply endorsement by the U.S. Government

For sa le by U.S. Geological Survey InformationServices, Box 25286, Federal Center, Denver, CO 80225

This map was produced on request, d irect ly fromdigi ta l f i les, on an electronic plotter. I t is a lso avai lable as a PDF f i le at http://geology.cr.usgs.gov

QUATERNARY

cra Hogback and rangefront colluvium, alluvium, and rock outcrop

pga Pediment gravel

PLEISTOCENE

jbg Granodiorite-block debris-avalanche deposit

PRE-QUATERNARY

R Bedrock

Open Water

Fault, Quaternary age—Bar and ball on downthrown side

w

High-angle reverse fault—Inferred, R on upthrown blockR

Contact

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5 50 10 15 20 25 KILOMETERS

105 0 5 15 20 MILES

CONTOUR INTERVAL 100 METERSSUPPLEMENTARY CONTOUR INTERVAL 50 METERS

1989 MAGNETIC DECLINATION FROM THE NORTH VARIES FROM 11.5ß (204 MILS) EASTERLY FOR THE CENTER OF THEWEST EDGE TO 10.5ß (187 MILS) EASTERLY FOR THE CENTER OF THE EAST EDGE. MEAN ANNUAL CHANGE IS 4.9’ WESTERLY

SCALE 1:250 000

ARIZONANEW MEXICO

UTAH

STERLINGI-1092

LAMARI-944

LA JUNTA

I-560

TRINIDADI-558

SALINAI-591

SHIPROCK

I-345

GALLUPI-981

ESCALANTE

I-744CORTEZ

I-629

MOABI-360

GRANDJUNCTION

I-736

MONTROSEMF-761

DURANGOI-764

LEADVILLEI-999

COLORADO

RIVER

PHOENIX

SALT LAKECITY

SANTA FE

PUEBLO

I-1022

ARKANSASRIVER

RIO

GR

AN

DE

GR

EEN

RIVER CRAIGI-972

LIMONI-1250

MF-2347I-1163

DENVER

COLORADO

AZTECI-1730

MARBLECANYON

I-1003

FLAGSTAFFI-1446

GREELEYOF 78-532VERNAL

I-1526

RICHFIELDI-1901

PRICEI-2462

SALT LAKECITYI-1997

116˚ 114˚ 112˚ 110 ˚ 108˚ 106˚ 104˚ 102˚

42˚

40˚

38˚

36˚

34˚

32˚

0 100 200 MILES

0 100 200 KILOMETERS

INDEX MAP SHOWING AREA OF PUEBLO QUADRANGLE,COMPANION GENERALIZED SURFICIAL GEOLOGIC MAP

OF THE DENVER QUADRANGLE (shown in gray), AND OTHER PUBLISHED 1˚ x 2˚ GEOLOGIC MAPS