5 50 20 25 30 KILOMETERS

SCALE 1: 250 0005 0 5 20 MILES

LIST OF MAP UNITS

HOLOCENE

afa Alluvial-fan deposit

cac

cacb Bouldery phase of arkosic loamy colluvium

cgh Arkose-clast loamy colluvium

xch Clayey, calcareous disintegration residuum

HOLOCENE AND LATE PLEISTOCENE

dba Crystal l ine-clast deposits

asaAlluvial sand, si l t , clay, and gravel (post-Piney Creek al luvium,

Piney Creek Alluvium, and pre-Piney Creek al luvium of Hunt, 1954, and Scott, 1960; Broadway Alluvium)

es Eolian sand

ed Stabil ized dune sand

jea Slump-block, earthflow, and mudflow landsl ide deposits

ccd Calcareous clayey colluvium

ccm Andesit ic clayey colluvium

caa Andesit ic loamy colluvium and sheetwash al luvium

clx

csk Grus, crystal l ine-clast col luvium, rock outcrop, and al luvium

csm Tuffaceous col luvium

cgc Gneiss- and granite-clast gravel ly col luvium

cbh Blocky sedimentary-rock colluvium

cbm Carbonate-clast loamy colluvium

cbs Rhyolite- and andesite-clast col luvium

cbu Mixed-l i thology blocky colluvium

xlu Feldspathic loamy disintegration residuum

xlv Loamy disintegration residuum, eolian sand, and sheetwash al luvium

xsa Feldspathic quartz-sand disintegration residuum

xgb Latite-clast disintegration residuum

HOLOCENE TO MIDDLE PLEISTOCENEQUATERNARY

PLEISTOCENE

LATE PLEISTOCENE

LATE AND MIDDLE PLEISTOCENE

MIDDLE AND EARLY PLEISTOCENE

EARLY PLEISTOCENE AND PLIOCENE?

PRE-QUATERNARY

tbj Mixed-l i thology-clast bouldery t i l l

jbc Bouldery crystal l ine-rock landsl ide deposit

xsg Feldspathic quartz-sand disintegration residuum

cra Hogback and rangefront col luvium, al luvium, and rock outcrop complex

elb Loess (Peoria Formation)

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

pga Pediment gravel

ags Alluvial sand, si l t , clay and gravel (Louviers and Slocum Alluviums, undivided;late middle Pleistocene)

tbk Bouldery t i l l ( t i l l of pre-Bull Lake glaciations)

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

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

QTdd Diamicton

R Bedrock

[For detai led descr ipt ions, thickness, and references, see fu l l - length "Descr ipt ion of Map Units" in accompanying pamphlet ]

Disintegrated deposits and periglacial deposits, bouldery t i l l , and rock outcrop

Mixed-l i thology-clast deposits dbd

Crystal l ine-clast bouldery t i l ltbg

Bouldery t i l l ( t i l l of Pinedale and Bull Lake glaciations)

Arkosic loamy colluvium and sheetwash al luvium

Clay loam colluvium

xch

xgbxsaxlvxlu

xsg

cra

cbucbscbmcbhcgccsmcskclxcaaccmccd cgh

cacbcac

jea

afa

asa

agm

QTdd

R

COLLUVIUM,ALLUVIUM,

ANDROCK OUTCROP

DISINTEGRATIONRESIDUAL DEPOSITSDEPOSITSCOLLUVIAL

LANDSLIDEDEPOSITS

EOLIANDEPOSITS

ALLUVIALDEPOSITS

GLACIAL, PERIGLACIAL,

DISINTEGRATEDDEPOSITS, ANDROCK OUTCROP

DIAMICTON

latePleistocene

middlePleistocene

earlyPleistocene

Pliocene

Holocene

BEDROCK

ed

CORRELATION OF MAP UNITS

dbddba

tbg tbj

tbk

es

pga

ags

elb

jbc

?

QUATERNARY

PRE-QUATERNARY

ggq

gge

csm

cbu

tbg

dba

gge

csk

csm

tbk

tbg

dba

tbg

dba

dba

dba

dba

csk

csk

dba

csk

csk

csk

dba

dba

dba

csk

csk

dba

dba

tbg

dba

tbj

dba

cbh

tbj

csm

csmcbh

gge

ggq

xch

gge

tbk

gge

ggq

asa

ggq

gge

cbs

asaggq

pga

cgh

cghags asa

xlu

ags

agm

asa

xsg

cac cac

asa

es

es

xlu

cac

clx

asa

asa

asaags

es

es

es

asaxlu

elb

elb

agm

cac

xlu

elb

ags

agm

cra

elb

ags

cac

elb

es

elb

agsxlu

elb

xsa

es

es

xlu

ags

elb

ed

asa

ed

agm

cra

xgb

xgbelb

ags

ags

ags

ccm

agselb

ags

asa

asa

asa

asa

elb

dba

csk

csk

es

es

asa

ags

xlu

cbh

ccd

cac

asa

xlu

xsa

asa

asa

es

elb

cac

asa

cac

clx

cacxsa

xsa

csm

csk

csk

csk

csk

asa

clx

ags

asa

es

elb

elb

asa

ags

elb

es

es

es

ags

caa

cgc

elb

asa

xlu

es

agm

asa

asa

asa

w

cbu

ccm

agm

ags

ags

ags

cac

xlu

elb

xlu

es

elb

jea

tbg

csm

ggq

tbg

jbc

asa

afa

jea

asa

ggq

asa

jbc

asa

asa

asa

jbc

jbc

asa

cgc

cgc

asa

jea

asa

cac

cac

asa

elb

w

elb

asa

asa

cac

cac

asa

asa

elb

ags

elb

es

elb

asa

ags

asa

ags

xlu

asaags

w

w

asa

asa

elbcra

agmw

jea

cac

asa

elb

w

xsg

cra

agm

ccd

csk

es

asa

asa

asa

cgc

elb

es

csk

csk

asa

asa

es

asa

cac

agm

cgc

cbh

cbs

csk

dba

cgc

jea

cbm

cbm

w

cac

ggq

jbcjbc

jbc

jbc

jbc

jbc

dba

tbk

cbu

QTdd

ags

cacb

cacb

cacb

cac

cacbcacb

cbh

csk

cacb

cacb

cacb

xsa

xlu

cac

cac

xlu

jea

gge

gge

w

w

elb

clx

clx

asa

xsa

cac

xlv

clx

clx

cgc

cgc

cgc

cgc

cacb

cac

cra

ags

ags

caa

agm

jbc

jbc

ags

agm

ccd

agm

ccd

agm

asa

agm

ags

cacb

agm

w

w

w

tbg

tbgtbg

tbg

tbg

tbg

dba

dbatbg

tbg

tbg

csk

tbg

tbg

tbk

dba

dba

tbg

tbg

jbc tbg

tbg

tbg

dba

ggq

jbc

tbg

tbg

dba

tbg

jbc

dba

tbg

tbg

dbd

cbu

tbg

R

R

R

R

R

R

R

R

R

RR

R

R

R

R

R

ags

agm

ags

ccd

asa

R

R

R

R

R

R

R

R

R

R

R

clx

R

ags

ags

asa

R

ccd

ags

cacb

ags

ags

elb

ags

cacb

R

R

R

R

cacb

clx

elb

dba

R

R

dba

R

jea

cbs

asa

clx

cra

agm

jea

es

elb

jea

w

csk

csk

csk

cgc

es

cac

elb

cbu

cgc

w

w

CONTOUR INTERVAL 200 FEETWITH SUPPLEMENTARY CONTOURS AT 100 FOOT INTERVALS

1978 MAGNETIC DECLINATION FROM TRUE NORTH VARIES FROM 18 (230 MILS) EASTERLY FOR THECENTER OF THE WEST EDGE TO 12 (210 MILS) EASTERLY FOR THE CENTER OF THE EAST EDGE

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

GENERALIZED SURFICIAL GEOLOGIC MAP OF THE DENVER 1º x 2º QUADRANGLE, COLORADOCompiled by

David W. Moore, Arthur W. Straub, Margaret E. Berry, Michael L. Baker, and Theodore R. Brandt2001

Any use of trade names in this publication is fordescriptive purposes only and does not imply endorsement by the U.S. Government.

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

This map was produced on request, directly fromdigital f i les, on an electronic plotter. I t is also avai lable as a PDF fi le at http://greenwood.cr.usgs.gov

MISCELLANEOUS FIELD STUDIES MAP MF-2347Version 1.0

Pamphlet accompanies map

Compiled during 1997-1999D.W. Moore, CoordinatorDigital Cartography by T. R. Brandtand M.L. Baker

Base from U.S. Geological Survey, 1953 (revised 1978)

Transverse Mercator Projection

100,000-foot grids based on Colorado Coordinate System,central and north zones

Black numbered lines indicate the 10,000-meter UniversalTransverse Mercator grid, zone 13

Contact

Open waterw

High-angle reverse fault, Quaternary age--Inferred,R on upthrown block

R

R

R

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

I-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 DENVER QUADRANGLEAND OTHER PUBLISHED GEOLOGIC MAPS