Watson Island State Park

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CORRELATION OF MAP UNITS

SURFICIAL UNITS

BEDROCK UNITS

QUATERNARY

CRETACEOUS

JURASSIC

Holocene

Pleistocene

Upper Jurassic

Middle Jurassic

Lower Jurassic

UpperCretaceous

LowerCretaceous

Upper and Lower(?)Cretaceous

Upper Triassic TRIASSIC

CENOZOIC

MEZOZOIC

EARLYPROTEROZOIC

Artificial-filldeposits

Alluvialdeposits

Alluvial and colluvialdeposits

Major angular unconformity

Major angular unconformity

LIST OF MAP UNITS

SURFICIAL UNITS

Artificial-fill deposits

Artificial fill (latest Holocene)

Alluvial deposits

Youngest alluvium deposited by the Colorado River (Holocene)

Youngest alluvium deposited by the Gunnison River (Holocene)

Alluvium deposited by tributary streams (Holocene and late Pleistocene)

Valley-fill deposit (Holocene and late Pleistocene)

Oldest alluvium deposited by the Colorado River (Holocene and latest Pleistocene)

Terrace alluvium of the Gunnison River, undivided (late to middle Pleistocene)

Terrace alluvium 30 of the Colorado River (middle Pleistocene)

Terrace alluvium 60 of the Colorado River (middle Pleistocene)

Terrace alluvium 60 of the Gunnison River (middle Pleistocene)

Terrace alluvium of the Colorado River over terrace alluvium of the Gunnison River (middle Pleistocene)

Terrace alluvium 100 of the Colorado River (middle Pleistocene)

Terrace alluvium 170 of the Colorado River (early Pleistocene)

Alluvial and colluvial deposits

Young fan-alluvium and debris-flow deposits (Holocene)

Alluvium and colluvium, undivided (Holocene and late Pleistocene)

Pediment deposit of Walker Field (late? Pleistocene)

Old alluvial-slope deposit (late Pleistocene)

Local gravel deposits (middle Pleistocene)

Local gravel deposits over terrace alluvium 30 of the Colorado River (middle Pleistocene)

Eolian and colluvial deposits

Eolian sand and sheetwash deposits (Holocene and late Pleistocene)

Eolian sand and sheetwash deposits over terrace alluvium 30 of the Colorado River (Holocene to middle Pleistocene)

Colluvial deposits

Younger landslide deposits (latest Holocene)

Colluvium (Holocene and late Pleistocene)

Older landslide deposits (Holocene to middle Pleistocene)

BEDROCK UNITS

Mancos Shale (Upper Cretaceous; Campanian to Cenomanian)

Dakota Formation (Upper and Lower? Cretaceous; Cenomanian and Albian?)

Burro Canyon Formation (Lower Cretaceous; Albian and Aptian)

Morrison Formation (Upper Jurassic)

Brushy Basin Member (Tithonian and Kimmeridgian)

Salt Wash Member (Kimmeridgian)

Tidwell Member (Kimmeridgian to latest Oxfordian)

Wanakah Formation (Middle Jurassic; Callovian)

Entrada Formation (Middle Jurassic; Callovian)

“Board beds” unit

Slick Rock Member

Kayenta Formation (Lower Jurassic; Pliensbachian and Sinemurian)

Wingate Sandstone (Lower Jurassic; Pliensbachian to Hettangian)

Chinle Formation (Upper Triassic)

Meta-igneous gneiss and migmatic meta-sedimentary rocks, undivided (Early Proterozoic)

Contact—Dashed where approximately located. Hachures on the low side of a scarp terrace where contact is coincident with terrace scarp

Normal fault—Dashed where approximately located; dotted where concealed. Bar and ball on downthrown side. Arrow shows relative motion in cross section

Anticline axial trace—Dashed where approximately located; dotted where concealed

Strike and dip of bedding

Inclined

Calculated from outcrop pattern using three-point solutions

Gravel pit (g) or bentonite quarry—Approximately located

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4

GEOLOGIC MAP OF THE GRAND JUNCTION QUADRANGLE, MESA COUNTY, COLORADOBy

Robert B. Scott1, Paul E. Carrara1, William C. Hood2, and Kyle E. Murray1

2002

Geology south of the Colorado River mapped byRobert Scott and William Hood in 1998 and 1999.Geology north of the Gunnison River mapped by

Paul Carrara in 1998 and 1999.Digital compilation by Kyle Murray in 2000.

Manuscript approved for publication December 26, 2001

Base from U.S. Geological Survey, 1962; photorevised 1973.Polyconic projection. 1927 North American Datum.10,000-foot grid based on Colorado coordinate system, central zone.1,000-meter Universal Transverse Mercator grid ticks, zone 12. 1 KILOMETER1 .5 0

SCALE 1:24 000

CONTOUR INTERVAL 20 FEETDOTTED LINES REPRESENT 10-FOOT CONTOURS

NATIONAL GEODETIC VERTICAL DATUM OF 1929

1/ 21 0 1 MILE

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

This map was produced on request, directly fromdigital files, on an electronic plotter

For sale by U.S. Geological Survey Information ServicesBox 25286, Federal Center, Denver, CO 802251-888-ASK-USGS

ARC/INFO coverages and a PDF for this map are available athttp://geology.cr.usgs.gov/pub/mf-maps/mf-2363

MISCELLANEOUS FIELD STUDIES MAP MF–2363Version 1.0

Pamphlet accompanies map

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

1U.S. Geological Survey, Denver, CO 802252515 Dove Court, Grand Junction, CO 81503

APPROXIMATE MEANDECLINATION, 1973

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