Post on 13-Oct-2020
Watson Island State Park
RiversidePark
af
af
af
af
af
af
af
af
af
af
af
af
af
af
afaf
af
af
af
af
af
Qalc1
Qalc1
Qalc1
Qalc1
Qalc1
Qalc1
Qalc1
Qalc1
Qalc1
Qalg
Qalg
Qalg
Qalg
Qalg
Qalg
Qalg
Qalg
Qalg
Qalg
Qalg
Qalg
Qa
Qa
Qa
Qa
Qa
Qa
Qa
Qa
Qa
Qa
Qalc2
Qvf
QtguQtgu
Qtgu
QtguQtgu
Qtgu
Qtgu
Qtgu
QtguQt30
Qt30
Qt30
Qt30
Qt30
Qt30
Qt30
Qt30
Qt60c
Qt60c
Qt60c
Qt60c
Qt60c
Qt60g
Qt60g
Qt60g
Qt60g
Qt60g
Qt60g
Qtc/Qtg
Qtc/Qtg
Qt100
Qt100
Qt100
Qt100
Qt100
Qt100
Qt100Qt100
Qt170
Qt170
Qt170
Qfy
Qfy
Qfy
Qfy
Qfy
Qfy
Qfy
Qfy
Qfy
Qfy
Qfy
Qfy
Qfy
Qfy
Qac
Qac
Qac
Qac
Qac
Qac
Qac
Qac
Qac
Qac
Qac
Qac
Qac
Qac
Qpwf
Qpwf
Qpwf
Qpwf
QpwfQpwf
Qpwf
Qpwf
Qpwf
Qpwf
Qpwf
Qpwf
Qpwf
Qpwf
Qaso
Qlg
Qlg
Qlg
Qlg
Qlg/Qt30
Qlg/Qt30
Qse/Qt30
Qse/Qt30
Qlsy Qlsy
QcQc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
QcQc
Qc
Qc
Qc
Qc
Qc
Qc Qc
QcQc
Qc
QlsoQlso
Qlso Qlso
Qlso
Qlso
Qlso
Qlso
Qlso
Qlso
QlsoQlso
Qlso
Qlso
Qlso
Qlso
Km
Km
Km
Km
Km
Km Km
Km
Km
Km
Km
Km
Km
Km
Km
Km
KmKm
Km
KmKm
KdKd KdKd
Kd
Kd
KdKd
Kd
Kd
Kd
Kd
Kd
Kd
Kd
Kd
Kd
Kd
Kd
Kd
Kd
KdKd
Kd
Kd
Kd
Kd
Kd
Kd
Kd
Kb
KbKb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
Kb
KbKb
Kb
Kb
Jms
Jms
Jmt
Jmt
Jmt
Jw
Jw
Jw
Jeb
Jeb
Jeb
Jes
Jes
Jes
JesJes
Jk
Jk
Jk
Jk
Jk
Jwg
Jmb JmbJmb
JmbJmb
Jmb
Jmb
Jmb
Jmb
Jmb
JmbJmbJmb
Jmb
Jmb
Jmb
JmbJmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Jmb
Qse
Qse
Qse
Qse QseQse
QseQse
Qse QseQse
QseQse QseQse
Qse
QseQse
Qse
Qse Qse
Qse Qse
Qse
Qse
Qse
QseQse
Qse
QseQseQse
Qse
Qse
QseQse
Qse
Qse
Qse
Qse
Qse
Qse
Qse
Qse
Qse
Qse
Qse
Qse
Qse
Qse
Qse
QseQse
Qse
Qac
?
?
?
6
714
5
7
4
131320
107
12
2028
6
21
4
3
9
5
4
4
6
3
4
10
13
15
4
9 10
10
38
3
353
12
7
5
g
g
g
g
G
g
g
g
g
g
g gg
ggg
g
g
g
g
g
g
g
bentonitequarry
afQalc1 Qalg
Qtgu
Qa QvfQfy
Qac
Qpwf Qaso
Qse Qc
Qlsy
QlsoQse/Qt30
Qlg
Qlg/Qt30
Qalc2
Qt30
Qt60c Qt60gQtc/Qtg
Qt100
Qt170
Km
Kd
Kb
Jmb
Jms
Jmt
Jw
Jeb
Jes
Jk
Jwg
Xu
�c
?
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
af
Qalc1
Qalg
Qa
Qvf
Qalc2
Qtgu
Qt30
Qt60c
Qt60g
Qt100
Qt170
Qfy
Qac
Qpwf
Qaso
Qlg
Qlg/Qt30
Qse
Qse/Qt30
Qlsy
Qc
Qlso
Km
Kd
Kb
Jmb
Jms
Jmt
Jw
Jeb
Jes
Jk
Jwg
�c
Xu
Qtc/Qtg
15
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
14 / °12
MA
GN
ET
IC
NO
RT
H
TR
UE
N
OR
TH COLORADO
QUADRANGLE LOCATION
A
A'
A A'
0 1 2
KILOMETERS
QseQse
QlsoQse
Kb KdKb Qse
Jmb
QlsoQfy af
QalgQfy
QseQac Qt30 Qfy Qt30 Qalc1 Qac af Qac af Qac
QpwfQac
KmKd
Kb
Jwg
JmsJmt
Jw
Jeb JesJk
�c
Xu
Xu
Xu
Kd
KIL
OM
ET
ER
S
KIL
OM
ET
ER
S
NORTHEASTSOUTHWEST
NORTHWEST FLANK OF UNCOMPAHGRE UPLIFT
Gun
niso
n R
iver
Col
orad
o R
iver
Col
orad
o R
iver
Inte
rsta
te 7
0
GRAND JUNCTION
GRAND VALLEY
Qse
af
Den
ver
and
Rio
Gra
nde
Wes
tern
Rai
lroa
d
2
1
2
1
00
Qse
Jmb
Jwg
�c
�c
Jmb
Km