ShellCreekShale

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tana

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upC

olor

ado

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up

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orad

o G

roup

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tana

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up

MuddySandstone

272511105123

Lawrence Barker1 Weinz et al.

Sec. 18, T. 03 N., R. 31 E.Yellowstone Co.

KB 2,858 ft

Pompey's Pillar

282511121152

Robert JackmanA Horton

Sec. 18, T. 07 N., R. 32 E.Yellowstone Co.

KB 3,463 ft

Wolf Springs

292508721482

Gear Petroleum44-7 Hougen

Sec. 07, T. 09 N., R. 32 E.Rosebud Co.

KB 3,191 ft

Injun Creek

302508705095

ContinentalOil1 NP

Sec. 29, T. 10 N., R. 32 E.Rosebud Co.

KB 3,306 ft

SE Bascomb

312508705295Texaco Inc.3-A Grebe

Sec. 15, T. 11 N., R. 32 E.Rosebud Co.

KB 3,001 ft

NW Sumatra

322508721298

Petro-Lewis Corp.16-36 State

Sec. 36, T. 12 N., R. 32 E.Rosebud Co.

KB 3,137 ft

Rattler Butte

332508721491

Hunt Oil1-28 Hunt Oil Co.

Sec. 28, T. 12 N., R. 33 E.Rosebud Co.

KB 3,152 ft

Wildcat

342508721550

Coastal Oil and Gas2 COGC 34-13-33 Galt

Sec. 34, T. 13 N., R. 33 E.Rosebud Co.

KB 3,072 ft

Breed Creek

352503321058

True Oil33-1 1 Burlington NorthernSec. 11, T. 14 N., R. 34 E.

Garfield Co.GR 3,496 ft

Wildcat

362503305061

Shell OilN P 41-29R

Sec. 29, T. 15 N., R. 34 E.Garfield Co.KB 3,334 ft

Wildcat

372503321084

Atlantic Richfield1-36 State-Lodgepole

Sec. 36, T. 16 N., R. 33 E.Garfield Co.KB 3,239 ft

Wildcat

382503321030

Montana Power9-8 Federal

Sec. 08, T. 17 N., R. 31 E.Garfield Co.KB 2,949 ft

Wildcat

25 mi 13 mi 4 mi 9 mi 4 mi 3 mi 5 mi 11 mi 4 mi 5 mi 17 mi

TD 4,392 ftJurassic Morrison Formation

Drilled and Abandoned

DST: 2,015-2,020 ft (Eagle);SI 30 min., open 1 hr; rec 730 ft GCW;

FP 110-195, SIP 254, HP 1,030-980

DST: 4,346-4,355 (Kootenai [3rd Cat Creek]);SI 22 min., open 1 hr 4 min.;

flowed water to surface in 1 hour;FP 920-1980, SIP 1,978,

HP 2,390-2,360

TD 6,168 ftPennsylvanian Amsden

Formation

Oil production from Amsden

DST: 3,645-3,727 (Carlile Shale);open 15 min., SI 49 min., open 60 min.,

SI 120 min., rec. 30 ft mud, 2,000 cc VSGCM;FP 66-56, 121-141; SIP 386-382,

HP 1,729-1,688

TD 6,034 ftMississippian Otter Formation

Production from Tyler Fm (Penn.)No Cretaceous DST

TD 7,830 ftCambrian, unspecifedDrilled and Abandoned

DST: 3,080-3,159 (Mosby);SI 30 min., open 1 hour;

rec. 60 ft gas and water-cutmud, 2,010 ft gassy, muddy

fresh water;FP 950-980, SIP 1290,

HP 1530

TD 4,830 ftMississippian Heath Formation

Oil production from Tyler Fm (Penn.)

DST: 426-640 (Judith River andClaggett Shale); open 30 min.;

rec. 98 ft drilling mud;no pressure data available

TD 5,736 ftMississippian Heath Formation

Oil production from Tyler Fm (Penn.)No Cretaceous DST

TD 5,486 ftMississippian Heath Formation

Drilled and AbandonedNo DST

TD 5,000 ftMississippian Heath Formation

Oil production from Tyler Fm (Penn.)No DST TD 6,032 ft

Mississippian Heath FormationDrilled and Abandoned

DST: 1,720-1,740 (Judith River);open 1 hour, SI 1 hour, open 90 min.,

SI 90 min.; rec. 910 ft SMCW;FP 151-414; 445-445; SIP 445-447;

HP 920-856

TD 5,852 ftMississippian Otter Formation

Drilled and Abandoned

DST: 4,174-4,208 (Fall River Sandstone);open 1 hour, SI 45 min.;

rec. 3,060 ft water cut mud;FP 400(?)-1,415; SIP 1,700-1,655;

HP 2,330

TD 6,223 ftMississippian Charles Formation

Drilled and AbandonedNo Cretaceous DST

TD 4,940 ftJurassic Swift FormationDrilled and Abandoned

No DST

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4751

52

Judith RiverFormation

Claggett Shale

GammonShale

NiobraraFormation

CarlileShale

GreenhornFormation

BelleFourcheShale

MowryShale

SkullCreekShale

Basal siltunit of

Skull CreekShaleFall

RiverSandstone

KootenaiFormation

Jurassicrocks

JUR

AS

SIC

LOW

ER

CR

ET

AC

EO

US

UP

PE

R C

RE

TA

CE

OU

S

SeriesFormation

JudithRiver

Formation

ClaggettShale

GammonShale

NiobraraFormation

Car

lile

Sha

le

GreenhornFormation

BelleFourcheShale

MowryShale

Skull CreekShale

Basal siltunit of

Skull CreekShale

Fall RiverSandstone

KootenaiFormation

FormationSeries

UP

PE

R C

RE

TA

CE

OU

SLO

WE

R C

RE

TA

CE

OU

S

Fox HillsSandstone

BearpawShale

Fox HillsSandstone

BearpawShale

Jurassicrocks

JUR

AS

SIC

C C'SOUTH NORTH

Bull Mountains basin Sumatra anticline Sumatra syncline Blood Creek syncline

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

1

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4

Stratigraphic note:

1. Operator's pick of Shannon Sandstone at 2,016 ft

2. Operator's pick of Frontier Formation at 3,036 ft

3. Operator's pick of Dakota silt at 4,220 ft4. Operaor's pick of Greybull Formation

at 4,352 ft

Stratigraphic note:

1. Operator's pick of Dakota Formation at 4,590 ft

2. Operator's pick of 3rd Cat Creek at 4,893 ft

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Stratigraphic note:1. Operator's pick of Colorado Shale at 2,382 ft2. Operator's pick of Newcastle Ss at 3,947 ft3. Operator's pick of Dakota Formation at 4,036 ft4. Operator's pick of 1st Cat Creek at 4,150ft5. Operator's pick of 2nd Cat Creek at 4,3486. Operator's pick of 3rd Cat Creek at 4,422 ft

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Stratigraphic note:

1. Operator's pick of Colorado Shale at 1,383 ft

2. Operator's pick of 1st Cat Creek at 3,100 ft

3. Operator's pick of 3rd Cat Creek at 3,427 ft

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Stratigraphic note:

1. Operator's pick of Colorado Shale at 2,080 ft

2. Operator's pick of Dakota silt at 3,975 ft

3. Operator's pick of Dakota sand at 4,084 ft

4. Operator's pick of 2nd Cat Creek at 4,330 ft

5. Operator's pick of 3rd Cat Creek at 4,400 ft

5

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Stratigraphic note:

1. Operator's pick of Thermopolis Shale at 3,651 ft

2. Operator's pick of Dakota Formation at 3,974 ft

3. Operator's pick of Fuson Formation at 4,062 ft

1

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Stratigraphic note:

1. Operator's pick of Niobrara Formation at 1,597 ft

2. Operator's pick of Dakota Formation at 3,352 ft

3. Operator's pick of 3rd Cat Creek at 3,788 ft

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Stratigraphic note:1. Operator's pick of Dakota silt at 4,362 ft2. Operator's pick of Dakota sand at 4,475 ft3. Operator's pick of 2nd Cat Creek at 4,750 ft4. Operator's pick of 3rd Cat Creek at 4,852 ft

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Stratigraphic note:

1. Opertor's pick of Newcastle Sandstone at 3,968 ft

2. Operator's pick of 1st Cat Creek at 4,170 ft

3. Operator's pick of 3rd Cat Creek at 4,555 ft

12

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Stratigraphic note:

1. Operator's pick of Niobrara Formation at 3,301 ft

2. Operator's pick of Greenhorn Formation at 3,362 ft

3. Operator's pick of Dakota silt at 4,637 ft

4. Operator's pick of Dakota sand at 4,752 ft

5. Operator's pick of Fuson Formation at 4,836 ft

6. Operator's pick of Lakota Formation at 5,008 ft

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Stratigraphic note:

1. Operator's pick of Dakota silt at 4,188 ft2. Operator's pick of Dakota sand at 4,286 ft3. Operator's pick of Kootenai Formation

at 4,368 ft4. Operator's pick of 2nd Cat Creek at 4,498 ft5. Operator's pick of Lakota Formation

at 4,637 ft

0

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FEET

Mos

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tone

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ands

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1

Stratigraphic note:

1. Operator's pick of ColoradoShale at 3,347 ft

Morrison Formation

3

5

65

4

Shell Creek Shale

Group

or MemberGroupor Member

MuddySandstone

DIGITAL DATA SERIESDDS-57

PLATE 4

Fort UnionFormation

andHell CreekFormation Hell Creek

Formation

Fox HillsSandstone

CROSS SECTION C-C', FROM THE BULL MOUNTAINS BASIN TO THE BLOOD CREEK SYNCLINE, NORTHEASTERN MONTANA

STRATIGRAPHIC FRAMEWORK OF LOWER AND UPPER CRETACEOUS ROCKS IN CENTRAL AND EASTERN MONTANABy

Steven M. Condon2000