*

*

*

*

?

?

??

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