*
*
*
*
?
?
??
2000
GR RES
GR RES
GR RESSP RESGR RESSP RESGR RES
GR RES
GR RES
GR RES
GR RES
GR RES
GR RES
GR RES
SP RES
GR RES
3
2
2
2
15
2
12
223
2500
2000
1500
1000
500
3000
3500
4000
4500
5000
3000
2500
2000
1500
1000
3500
4000
4500
5000
35
2
5
11
416
9
20
6
4500
4000
3500
3000
2500
2000
5000
5500
6000
3
22
5
41
8
2
12
13
44
3
33
510
2
500
1000
2
323
101145
43
2000
2500
3000
2
2
225
3
2
6
1500
2500
3000
3500
1500
1000
500
113
2
22
2
221
21
2
2
2
2
2
6
142
1500
1000
500
2000
2500
3000
3
3
52
6
44
2
2
42
6
2
4
2
2500
3000
3500
2
6
3
2
3
2
500
1000
500
1500
2000
2500
2
1
12
419
2
2
1
2
62
1000
500
1500
2000
2500
3000
2000
1500
4000
4500
5500
6000
6500
4500
4000
3500
3500
4500
5000
4000
4500
4000
3500
3500
4000
4500
3000
3500
4000
1000
1500
2000
500
26
93132
22618
8
243
43
4
73
45
10
3
3
1000
500
015
0020
0025
0030
0035
00
2
2
2
2
262
3
32
1
6000
5500
5000
4500
4000
3500
3000
7000
6500
4500
3500
3000
2000
2500
1500
4000
5000
5500
6000
6500
7500
8000
7000
Placita seam
grain size increases to the right
6000
5500
5000
4500
4000
3500
3000
2500
6500
2500
3000
2000
1500
1000
500
5000
5500
2500
3000
3500
shift
1000
1500
2000
2500
3000
3500
4000
4500
GR RES
2
2
4
3
3
2
Run two
Pasco-Spatafore 1
T. 11 S., R. 90 W.
Hotchkiss 3-11
T. 12 S., R. 90 W.
Michelson-2
T. 11 S., R. 94 W.
Smith 1-C
T. 11 S., R. 95 W.
Sommerville #1
T. 11 S., R. 97 W.
Colorado Federal C-1
T. 12 S., R. 92 W.
Bowie Unit #1
T. 12 S., R. 91 W.
30 31 32 33 34 35 36 37
Coal Basin area
T. 10 S., R. 89 W.
Modified from Collins (1976, 1977)
A'
State line
Uta
h
Col
orad
o
1-5-23
T. 5 S., R. 104 W.
Rat Hole Canyon 23-14-25
T. 14 S., R. 25 E.
2120
B-12-6-104S Young Cattle
T. 6 S., R. 104 W.
22
Federal 1-30
T. 6 S., R.102 W.
23
Coal Gulch 15-9
T. 8 S., R. 101 W.
25
Belco Federal 19-1-800
T. 8 S., R. 100 W.
26
Winter Flat 1-10-100
T. 9 S., R. 100 W.
27
USA-1-8 MR
T. 10 S., R. 99 W.
28
CA-77-2
T. 10 S., R. 98 W.
2924
Mesagar Federal 20-1
T. 7 S., R. 101 W.
State line
Uta
h
Col
orad
o
Cross section is approximately perpendicular to paleoshoreline Cross section is subparallel to paleoshoreline
about 10 mi3 mi6 mi9 mi11 mi8 mi8 mi 9 mi 10 mi 7 mi 5 mi 4 mi 5 mi 8 mi 8 mi 6 mi 1 mi 2 mi
State line
mai
n bo
dy o
f Man
cos
Sha
le (
part
)
Castlegate Ss.
Buc
k To
ngue
of
Man
cos
Sha
leS
ego
San
dsto
ne
Tert
iary
(pa
rt)
Upp
er C
reta
ceou
s (p
art)
Mes
aver
de G
roup
and
tong
ues
of th
e M
anco
s S
hale
Gre
en R
iver
and
W
asat
ch F
orm
atio
ns
(und
ivid
ed)
Nes
len
For
mat
ion
Farr
er F
orm
atio
nTu
sche
r F
orm
atio
n
Bow
ie S
hale
Mem
ber
Pao
nia
Sha
le M
embe
r
Will
iam
s F
ork
For
mat
ion
(par
t)
uppe
r "u
ndiff
eren
tiate
d" W
illia
ms
For
k F
orm
atio
n (p
art)
Iles
For
mat
ion
and
tong
ue o
f Man
cos
Sha
le
Rollins SandstoneMember
CozzetteMbr.
tongue
of
Mancos
Shale
Mes
aver
de G
roup
(pa
rt)
Upp
er C
reta
ceou
s (p
art)
mai
n bo
dy o
f Man
cos
Sha
le (
part
)
Pra
irie
Can
yon
Mem
ber
of th
e M
anco
s S
hale
5
top of Castlegate equivalent
top of Grassy Member equivalent
Geo
grap
hic
boun
dary
of n
omen
clat
ure
chan
ge
seq. bdry. 1 (?)
seq. bdry. 6 (?)
seq. bdry. 8 (?)
seq. bdry. 9 (?)
Castlegate seq. bdry.
Anchor Mine Tongueof the Mancos Shale
Neslen sequence boundary Neslen sequence boundary
Corcoran Member
Cozzette Mbr.
upper part of
Sego Ss.
Palisade coal zone
Cameo-Wheeler coal zone
lower part of Sego Ss.
Chesterfield coal zone
Projected top of the Mesaverde Group. The projection is based on nearby measured section 20 of Fisher and others (1960) where strata equivalent to the top of the Ohio Creek Conglomerate were described about 2,200 ft above the base of the Anchor Mine coal zone.
Projected top of the Mesaverde Group. The projection is based on a nearby measured section at Baxter Pass (T. 6 S., R. 104 W.) by Johnson (1989b) where the Cretaceous-Tertiary unconformity was shown to be about 1,770 ft above the Sego Ss.
Projected top of the Mesaverde Group. The projection is based on nearby measured section 21 of Fisher and others (1960) where strata equivalent to the top of the Ohio Creek Conglomerate were described about 2,600 ft above the Sego Ss.
Projected top of the Mesaverde Group. The projection is based on nearby measured section 23 of Fisher and others (1960) where the top of the Ohio Creek Conglomerate was described about 2,400 ft above the Sego Ss.
Cameo-Wheeler
coal zone
South Canyon
coal zone
Coal Ridge coal zone
lower part
upper part
maximum flooding surface, local datum
?
Sunshine seam
Coal Basin seams
Dutch Creek seam
?
?
Projected top of the Mesaverde Group. The projection is based on nearby measured section 19 of Fisher and others (1960) where strata equivalent to the top of the Ohio Creek Conglomerate were described about 1,820 ft above the Sego Ss.
Position of the Mesaverde-Wasatch contact as picked in the Spatafore 1 drill hole by the drillers.
Position of the Cretaceous-Tertiary unconformity and top of the Ohio Creek Formation as picked in the Smith 1-C drill hole by Johnson and others (1979).
Anchor coal zone ofYoung (1955)
upper sandstone
middle sandstone
Tertiary Green River and
Wasatch Formations
(undivided)
Str
atig
raph
ic p
ositi
on o
f Mou
nt G
arfie
ld F
orm
atio
n
acco
rdin
g to
Fis
her
and
othe
rs (
1960
)
Will
iam
s F
ork
For
mat
ion
(thi
s re
port
)Ile
s F
m. (
this
rep
ort)
local datum
Young (1955)of
STRATIGRAPHY OF THE UPPER CRETACEOUS MANCOS SHALE (UPPER PART) AND MESAVERDE GROUP IN THE SOUTHERN PART OF THE UINTA AND PICEANCE BASINS, UTAH AND COLORADOBy
R.D. Hettinger and M.A. Kirschbaum2002
GEOLOGIC INVESTIGATIONS SERIES I–2764(SHEET 2 OF 2)
Pamphlet accompanies map
U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY
Printed on recycled paper
Manuscript approved for publication May 6, 2002
Any use of trade names in this publication is fordescriptive purposes only and does not imply endorsement by the U.S. Geological Survey
For sale by U.S. Geological Survey Information ServicesBox 25286, Federal Center, Denver, CO 802251-888-ASK-USGS
A PDF for this map is available at http://geology.cr.usgs.gov/greenwood-pubs.html
CONVERSION FACTORS
Multiply By To obtain
inches (in.) 2.54 centimeters (cm)feet (ft) 0.3048 meters (m)miles (mi) 1.609 kilometers (km)
EASTERN PART OF CROSS SECTION A–A', PICEANCE BASIN, COLORADO
EXPLANATION
Contact that rises stratigraphically—Dashed where approximate; queried where uncertain
Contact—Dashed where approximate; queried where uncertain
Datum—Represents surface of maximum marine transgression (maximum flooding surface)
Sequence boundary unconformity and correlative conformity— Dashed where approximate; queried where uncertain
Contacts
Marker bedFossils
Roots
Leaves Burrows
Bivalves
Gastropods
Logs
10 O' Byrne and Flint (1995)
11 Olsen (1995)
12 Taylor and Lovell (1995)
13 Van Wagoner (1991a)
14 Van Wagoner (1991b)
15 Van Wagoner (1991c)
16 Van Wagoner (1995)
17 Van Wagoner and others (1990)
18 Yoshida and others (1996)
19 Young (1955)
1 Balsley (1980)
2 Clark (1928)
3 Cole and others (1997)
4 Franczyk and others (1990)
5 Hampson and others (1999)
6 Kellogg (1977)
7 Lawton (1983)
8 Lawton (1986)
9 McLaurin and Steel (2000)
Footnotes
Inferred estuarine sandstone and mudrock
Braided fluvial; predominantly sandstone
Fluvial sandstone and mudrock in the Mesaverde Group
Coastal plain sandstone and mudrock; coal zones are darker green
Upper and middle shoreface; predominantly sandstone
Lower shoreface sandstone and mudrock
Offshore; predominantly mudrock
Lithologic and depositional interpretations
Estuarine sandstone and mudrock
Note: Coastal plain and fluvial facies may include tidally influenced strata
Fluvial and lacustrine sandstone, limestone, and mudrock in the North Horn, Wasatch, and Green River Formations
x x x Ash bed
Covered interval
Calcareous mudstone
Sedimentary structures
Trough cross stratification
Mudstone clastRipple lamination
Tabular planar cross stratification
Pebble
Lateral accretion bedding
Wavy bedding
Hummocky cross stratification
Horizontal lamination Sintered mudstone (clinker)
Lenticular bedding
Flaser bedding
Streaky bedding
Chert
Sigmoidal bedding
Wave ripples
Limestone
Vertical scale
00
10030METERS FEET
Scale
4 miDistance between drill holes and measured sections. Horizontal spacing is not to scale.
GR RES
Coal Gulch 15-9
T. 8 S., R. 101 W.
25
Drill hole information (additional information provided in table 1)
Drill hole locality number shown on cross section and on figure 1
Location (Township, Range)
Drill hole name
Columnar section showing coal beds (black) penetrated by drill hole. Down-hole depths are shown at 100-ft intervals and lableled at 500-ft intervals. Thickness of coal is shown in feet on left side of column. Thickness of bracketed interval represents total coal in an interval that also contains partings; the partings are thinner than the adjacent coal seams and are not included in the recorded coal thickness.
Geophysical logs—Gamma ray (GR) or spontaneous potential (SP) logs are shown to the left of the columnar section; resistivity log (RES) is shown to the right of the columnar section. Resistivity logs are plotted using a logarithmic scale.
1000
1
124
1922
Grain size shown on measured sections
cl clay
s silt
vf very fine
f fine
m medium
c coarse
Abbreviations
Fm. Formation
Mbr. Member
Ss. Sandstone
Sh. Shale
seq. sequence
bdry. boundary
sb. sequence boundary