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Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government
This map was printed on an electronic plotter directly from digital files. Dimensional calibration may vary between electronic plotters and between X and Y directions on the same plotter, and paper may change size due to atmospheric conditions; therefore, scale and proportions may not be true on plots of this map.
For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225, 1–888–ASK–USGS
Digital files available at http://pubs.usgs.gov/sir/2012/5041/
Suggested citation: Johnson, R.C., 2012, The systematic geologic mapping program and a quadrangle-by-quadrangle analysis of time-stratigraphic relations within oil shale-bearing rocks of the Piceance Basin, western Colorado: U.S. Geological Survey Scientific Investigations Report 2012–5041, 28 p., 2 pls., CD-ROM, also available at http://pubs.usgs.gov/sir/2012/5041/.
Sampled tuff
Sampled tuff
Sampled tuff
8
7
6
5
4
3
2
1
0
Buff
Ligh
tM
ediu
mDa
rkBl
ack
Purp
leM
aroo
n
Clay Silt
Very
-Fin
eFi
neM
ediu
mCo
arse
Cong
lom
erat
e
17
16
15
14
13
12
11
10
9
18
8
7
6
5
4
3
2
1
0
17
16
15
14
13
12
11
10
9
18
19
Hundreds offeet
2 in pinching tuff
Carbonate ripups, 3 pinching tuffs to 1 in
Some pinching bedding
2.5-4 in tuff, Mahogany markerChevron folds
Dolomite beds and nodules
NonlaminatedNonlaminated
Nonlaminated
Nonlaminated
Nonlaminated
Nonlaminated
Nonlaminated
Nonlaminated
Nonlaminated
Mostly nonlaminated
Nonlaminated, bright white
Large unusual crystals
Blades of calcite
Fissile, a few dolomite beds to 2 in thick
Fissile
Fissile, dolomitic
Fissile
Fissile
Fissile, alternating richand lean beds
Thin dolomite beds, carbonate ripups
Possible insects
33
50-53
65-72
110
125
405
418
430
395-400
558
550
507
530
495497
450
565
595
130-131
150-153.5157
325-326.5
312-314
335-340
261.5-276
170175
160
223230
210
252.252.3
260-261.5
365-365.7
370
567576
583580
668.5-673
630
698-700
706-709713-715
727-728
742-743
760-762
635-637
650-651654-656665-667
682-687
625
770
810814
816825
855857
880
957
1075
1066
11331139
119511911188
1177
1144-45
1164-65
1241
1250
1345
141014191423
1432-35
1451-55.5
1485-87
1440
1445
15101517
1260-63
1265-66
1322-25
1351-541357-591361-651369-711379-80
1388-95
1406-08.5
1347-47.5
12041205
1030-1032
1104-11051108-1110
1098-1102
1085-10871081.5-1083.5
1046-1046.3
884
832
891-893898-900
910-911.5913-914.3
927-928
938-939
1585
1610
1620
1635
16501653
1670
1690
1705
1730
1745
1770
1810
1855-58
1840
17931795
1763-65
1790-91
1639-41
5-in-thick sandy siltstone
Some very lean oil shale
Some very lean oil shale
Hard, dolomitic
White marl
White marl
(New to this report)
South–North Cross Section of the Piceance Basin Showing Variations in Oil and Water Yields from Fischer Assay and Major Water-Bearing Phases in Green River Formation(Modified from Johnson and others, in press)
ByRonald C. Johnson
2012
Carbonate and black chert grains
Black chert, secondary calcite, pinches out 100 ft along outcrop
Mostly light grayMostly light gray
Sharp base
Sharp base, persistent
Goniobasis, viviparidsSlightly fissile
Small scour-and-fill channels
A few ostracode beds to 1 in thick
15% light mud laminae
4 in thick
2 ft thick
0.7 ft thick
Some sand, carbonate ripups
slightly fissile, thin ostracode beds
10% light mud beds to 1 in
Ostracode beds to 4 in, carbonate ripups
one 2-inch dolomite bed
DolDolomite concretions to 10 in, distinctive cracks
Thin ostracodal ss beds
Fissile, 5% dolomite beds to 2 in thick
Rich, fissile, 2 ft thick
Fissile, very fewdolomite beds
1-in-thick tuff in rich oil shale
Slightly fissile
Slightly fissile, dolomitic
Slightly fissile, dolomitic
Moderately fissile
Moderately fissileVery fissile
Interbedded shale and oil shale
Fissile, dolomite beds to 1 in
Dolomitic
Dolomitic
Dolomitic
Dolomitic
Dolomite concretions to 2 in.
1-in thick dolomite bed at top
Dolomitic, some verylean oil shale zones
Tuff, 3-4 in thick, locally to 6 in thick
Carbonate ripups near base
Rich beds split by lean bed, carbonate ripups
Carbonate ripups
Nahcolite vugs to 6 in
Hard, dolomitic, buffdolomite beds to 2 in
Carbonate ripups near top
Carbonate ripups near topand base well laminated in middle
Carbonate ripups to 4 in
Carbonate ripups
Carbonate ripups
Pinching tuff to 2 in
Pinching tuff
Rich and moderate rich bands
Three 1-inch rich beds
All well-laminated siltstone
2-in tuff 6 in below rich bed
1 in pinching tuff Nahcolite vugs to 18 in
Distinctive droopy ledge
Hard, platy marl
Rust-weathering silty sandstone,no discernible bedding, but exposure is poor
No apparent bedding
Mostly indistinct bedding,bright, volcanic quartz,5% dark grains
Chaotic
Interbedded very leanoil shale and white marl
U.S. Department of the InteriorU.S. Geological Survey
Scientific Investigations Report 2012–5041Plate 2
Oil shale zoneboundary
Mahogany
R-6
L-5
R-5
L-4
R-4
L-3
R-3
L-2
R-2
L-1
R-1
R-0
Mahogany
R-6
L-5
R-5
L-4
R-4
L-3
R-3
L-2
R-2
L-1
R-1
R-0
B-groove
A-groove
A-groove–top Bed 44
Mahoganyzone
Top Mahogany bed
Top Bed 44
Gard
en G
ulch
Mem
ber
Para
chut
e Cr
eek
Mem
ber
500
1,000
1,500
2,000
2,500
3,000
3,200
100 80 60 40 20 0 5 10 15 20 25
100 80 60 40 20 0 5 10 15 20 25
500
1,000
1,500
2,000
2,500
3,000
3,200
500
1,000
1,500
2,000
2,500
2,800
100 80 60 40 20 0
100 80 60 40 20 0
500
1,000
1,500
2,000
2,500
2,800
5 10 15 20 25
5 10 15 20 25
500
1,000
1,500
2,000
2,200
0
100 80 60 40 20 0
100 80 60 40 20 0
500
1,000
1,500
2,000
2,200
0
5 10 15 20 25
5 10 15 20 25
0
100
100
150
50
200
300
400
500
FEETMETERS
Vertical scale
R-0 zone
R-1 zone
R-2 zone
R-3 zone
R-4 zone
R-5 zone
L-1 zone
L-2 zone
L-3 zone
L-4 zone
L-5 zone
R-6 zone
L-0 zone
Long Point measured sectionSecs. 7, 8, 19, T. 7 S., R. 97 W.
(from Johnson, 1975)
Lower Piceance Creek measured sectionSecs. 11, 12, 14, T. 1 N., R. 87 W.
Major water-bearing phases
Index map
R 96 W R 95 W
R 101 W R 100 W R 99 W R 98 W R 97 WR 94 W
T8S
T7S
R 93 W
T6S
T5S
T4S
T3S
T9S
R 94 W
R 101 W R 100 W R 99 W R 98 W R 97 W
T2S
T1S
T1N
R 96 W R 95 W
T2N
108°0'108°30'
40°0'
39°30'
EXPLANATION
A'
A
0 6 123 MILES
COLORADO0 5 102.5 KILOMETERS
A
A'
14.9 GPT
13.7 GPT
23.3 GPT
24.4 GPT 27.5 GPT
20.6 GPT
2.1 GPT
2.3 GPT
10.5 GPT8.2 GPT
15.9 GPT
27.2 GPT41.3 GPT
29 GPT
1.5 GPT
6.3 GPT
3.6 GPT 4.32 GPTW
4.22 GPTW
3.85 GPTW
3.08 GPTW
3.99 GPTW
7.6 GPT 3.33 GPTW
2 GPT 5.72 GPTW
8.1 GPT 3.50 GPTW
2.2 GPT 2.60 GPTW
7 GPT 3.57 GPTW
23.2 GPT 2.73 GPTW
6.3 GPT 1.92 GPTW
1.4 GPT
4.7 GPT
3 GPT
10.3 GPT
6.4 GPT
9.6 GPT
3.6 GPT
10.1 GPT
3.3 GPT
25.5 GPT 2.30 GPTW
1.64 GPTW
3.57 GPTW
3.46 GPTW
3.74 GPTW
4.11 GPTW
5.09 GPTW
3.94 GPTW
3.12 GPTW
4.87 GPTW
4.41 GPTW
6.15 GPTW
10.2 GPT
13.1 GPT
10.1 GPT
18.2 GPT
13.5 GPT
16 GPT
10.9 GPT
21.8 GPT
4.5 GPT
28.4 GPT
5.5 GPT 1.45 GPTW
2.40 GPTW
0.825 GPTW
1.16 GPTW
2.01 GPTW
1.18 GPTW
3.51 GPTW
1.97 GPTW
2.00 GPTW
2.01 GPTW
3.70 GPTW
4.70 GPTW
5.50 GPTW
5.28 GPTW
4.89 GPTW
0.62 GPTW
4.1 GPT
9.6 GPT
6.7 GPT
20.6 GPT
12.6 GPT
16.8 GPT
12.9 GPT
22 GPT
3.6 GPT
25.7 GPT
5.8 GPT
15.9 GPT
3.64 GPTW
2.50 GPTW
2.60 GPTW
1.93 GPTW
1.66 GPTW
2.94 GPTW
1.59 GPTW
2.83 GPTW
0.697 GPTW
3.96 GPTW
6.13 GPTW
7.38 GPTW
4.70 GPTW
4.95 GPTW
7.60 GPTW
4.37 GPTW
2.53 GPTW
3.62 GPTW
3.37 GPTW
3.58 GPTW
2.91 GPTW
0.834 GPTW
4.32 GPTW
2.78 GPTW
3.06 GPTW
2.65 GPTW
3.57 GPTW
5.80 GPTW
6.36 GPTW
8.96 GPTW
9.84 GPTW
8.54 GPTW
3.71 GPTW
7.13 GPTW
5.94 GPTW
6.30 GPTW
5.99GPTW
2.11 GPTW
1.22 GPTW
1.01 GPTW
2.42 GPTW
2.85 GPTW
3.55 GPTW
5.87 GPTW
4.83 GPTW
2.50 GPTW
1.81 GPTW
3.38 GPTW
2.65 GPTW
3.33 GPTW
2.95 GPTW
2.63 GPTW
1.56 GPTW
1.21 GPTW
1.74 GPTW
2.44 GPTW
3.91 GPTW
2.29 GPTW
1.64 GPTW
1.80 GPTW
3.01 GPTW
6.13 GPTW
5.13 GPTW
5.56 GPTW
4.89 GPTW
3.28 GPTW
2.75 GPTW
1.39 GPTW
3.06 GPTW
3.34 GPTW
4.21 GPTW
2.27 GPTW
2.19 GPTW
2.47 GPTW
3.27 GPTW
4.78 GPTW
4.52 GPTW
5.00 GPTW
5.10 GPTW
1.50 GPTW
1.27 GPTW
4.9 GPT
11.6 GPT
6.5 GPT
28.3 GPT
14.1 GPT
20.4 GPT
13.3 GPT
25.5 GPT
5 GPT
27 GPT
13.9 GPT
24.6 GPT
14.6 GPT
31 GPT
22.3 GPT
31.3 GPT
20 GPT
31.5 GPT
31.1 GPT
12 GPT
12 GPT
23.4 GPT
31.6 GPT
22.1 GPT
41.8 GPT
25.3 GPT
41.4 GPT
17.1 GPT
27.9 GPT
8.7 GPT
29.9 GPT
6.1 GPT
6.5 GPT
17 GPT
26.3 GPT
17.8 GPT
33.2 GPT
17.5 GPT
21 GPT
9.9 GPT
7 GPT
22.4 GPT
2.7 GPT
0.4 GPT
About 7 GPT
About 4 GPT
1.2 GPT
11.4 GPT
2.2 GPT
12.1 GPT
6.1 GPTAbout 4 GPT 8.2 GPT
14.1 GPT
3.1 GPT
9.2 GPT
8.5 GPT
13.8 GPT15.7 GPT
12.4 GPT
14.7 GPT
11.8 GPT
6.3 GPT
5.4 GPT
1.8 GPT
11.6 GPT
1.9 GPT 2.48 GPTW
0.1 GPT
About 2 GPT
About 12 GPT
About 6 GPT
About 3 GPT
About 2 GPT
About 14 GPT
About 16 GPT
About 11 GPT
About 11 GPT
About 22 GPT
About 14 GPT
About 14 GPT
About 17 GPT
About 21 GPT
About 7 GPT
Sandstone
Oil shale
Nahcolite
Analcime and clay
Dawsonite
Clay
Dawsonite, analcime, and clay
Dawsonite and clay
Silty dolomitic limestone
Dolomitic and calcareous siltstone
Algal stromatolites
Dolomitic and calcareous claystone
Sandy limestone
Silty sandstone
Silty claystone
Kerogen-rich clay shale
Crossbedded sandstone
Long Point measured section
Correlation datum is the top of the R–4 zone
Limestone
Pelcypod
Climbing ripples
Symmetrical ripples
Horizontal stratification
Internal characteristics
Irregular stratification
Contorted stratification
Claystone, clayshaleor mudstone
Siltstone
Sandstone
LITHOLOGY
Large-scalelateral accretion
10
11
12
Buff to whiteLight gray/greenMedium gray/greenDark gray/greenBlackPurpleMaroon
Pebbles and cobblesCoarse sandMedium sandFine sandVery fine sandSiltClay
Covered
Irregular scour surface
Pinches outalong outcrop
Calcareous concretions
Thins along outcrop
Partially covered
GRAIN-SIZE RANGELITHOLOGYUNWEATHERED COLOR
Lower Piceance Creek measured section
EXPLANATION
Core holes
Hundreds offeet
Oil shale
Calcareous and/or dolomitic rock
Ostracodes
Gastropods
Plant remains
Oolites
Oncolites
Hatched ifolive gray
Ripup clasts
Cross-stratification, 1 to 3 ft high
Cross-stratification, greater than 3 ft high
Fish bones or fish scales
Indistinct laminae100 80 60 40 20 0
C0195Arco-Mobil-Equity
Figure Four 31-1Sec. 31, T. 3 S., R. 98 W.
500 500
5 10 15 20 25
25.7 GPT
5.8 GPT
3.6 GPT
15.9 GPT
Average oil yield in gallonsper ton of oil shale (GPT)for each oil shale zone
Average water yield in gallonsper ton of oil shale (GPTW)
for each oil shale zone
3.64 GPTW
3.28 GPTW
1.50 GPTW
1.27 GPTW
Depth in feet
Mahogany ledge outcrop
Base of Parachute Creek Member
Datum (base of Long Point Bed of Green River Formation)
100 80 60 40 20 0 5 10 15 20 25 30
100 80 60 40 20 0 5 10 15 20 25 30
500
1,000
1,500
2,000
2,500
2,700
500
1,000
1,500
2,000
2,500
2,700
100 80 60 40 20 0
100 80 60 40 20 0
C0195Arco-Mobil-Equity
Figure Four 31-1Sec. 31, T. 3 S., R. 98 W.
C0248Carter Oil Co.Fawn Creek 2
Sec. 27, T. 3 S., R. 98 W.
C0158Shell Oil Co.Greeno 1-4
Sec. 4, T. 3 S., R. 97 W.
C0012Pan American Oil Co.
Peterson 1Sec. 4, T. 2 S., R. 98 W.
C0034U.S. Bureau of Mines/AEC
Colorado 1Sec. 13, T. 1 N., R. 98 W.
500
1,000
1,500
2,000
2,500
500
1,000
1,500
2,000
2,500
5 10 15 20 25
5 10 15 20 25
100 80 60 40 20 0 5 10 15 20 25
100 80 60 40 20 0 5 10 15 20 25
C0232Humble Oil & Refining Co.
East Willow Creek 1Sec. 28, T. 4 S., R. 97 W.
500
1,000
1,500
2,000
0
500
1,000
1,500
2,000
0
100 80 60 40 20 0 5 10 15 20 25
100 80 60 40 20 0 5 10 15 20 25
C0383Shell Oil Co.
DH 8 (Pacific Property)Sec. 14, T. 6 S., R. 98 W.
500
1,000
1,500
2,000
500
1,000
1,500
2,000
C0172Shell Oil Co.
23X-10Sec. 10, T. 7 S., R. 97 W.
Oil yield gallons per ton Water yield gallons per ton
Oil yield gallons per ton Water yield gallons per ton
Oil yield gallons per ton Water yield gallons per ton
Oil yield gallons per ton Water yield gallons per ton
Oil yield gallons per ton Water yield gallons per ton Oil yield gallons per ton Water yield gallons per ton
Oil yield gallons per ton Water yield gallons per ton
Oil yield gallons per ton (GPT) Water yield gallons per ton (GPTW)
Oil yield gallons per ton Water yield gallons per ton
Oil yield gallons per ton Water yield gallons per ton
Oil yield gallons per ton Water yield gallons per ton Oil yield gallons per ton Water yield gallons per ton
Oil yield gallons per ton Water yield gallons per ton
Oil yield gallons per ton Water yield gallons per ton Oil yield gallons per ton Water yield gallons per ton
Oil yield gallons per ton (GPT) Water yield gallons per ton (GPTW)
100 80 60 40 20 0 5 10 15 20 25
100 80 60 40 20 0 5 10 15 20 25
500
1,000
1,500
0
500
1,000
1,500
0
