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Home , Carlile Shale, Claggett Shale, Eagle Sandstone, Niobrara Formation

DIGITAL DATA SERIES U.S. DEPARTMENT OF THE INTERIOR DDS-57 U.S. GEOLOGICAL SURVEY PLATE 1

EXPLANATION FOR PLATES 2 - 5 A A' 2 Arbitrary well number, keyed to index map (below) WEST Hell Creek 5 EAST 1 Formation 2501521037 American Petroleum Institute (API) well number (API number is composed of several Fox Hills 9 Volcanic rocks 8 Montana Power Company Operator name parts as shown here: 1 (incomplete) 8-8 Hettrick Well number and name 25 State code for Montana Bearpaw 12 10 11 Sec. 08,T. 29 N., R. 14 E. Spot location of well 015 County code for Chouteau Co. 3 4 KB 3,065 ft Elevation of kelly bushing (feet above sea level) 21037 Number for well within county) Judith River Formation 13 Judith River Formation Wildcat Field in which well is located olcanic rocks V 14 TD 3,675 Total depth of well (feet above sea level) and Telegraph Creek Formation Madison Formation at total depth 7 Drilled and Abandoned Status of well 6 1

olcanic rocks Bowdoin sandstone

DST: 1,035-1,095 (Eagle) Drill-stem test information: interval and formation tested, V Greenhorn Formation SI 30 min., open 1 hour 30 min., shut-in and open times, recovery, pressures. See below for Mosby Sandstone Member Phillips sandstone1 SI 1 hour 30 min; rec. 500 ft MCW; abbreviations used Belle Fourche Shale FP 70-285, SIP 358-358, HP 590-582 Shell Creek Shale Stratigraphic notes: 1 Notes on stratigraphic units in the well. These consist Muddy Sandstone of operator's picks of some stratigraphic units and Skull Creek Shale Basal silt unit of 1. Operator's pick of Virgelle Sandstone observations from sample descriptions. Notes are Skull Creek Shale Fall River Sandstone Member of Eagle Sandstone at 1,161 ft keyed to numbers along the right margins of the logs Kootenai Formation 1 rocks Of subsurface usage

Meters Feet B' Producing interval 5000 B 1500 EAST WEST 25 26

Fort Union Drill stem test interval Formation 4000

Hell Creek 20 24 Formation Geophysical logs: 19 23 1000 Fox Hills Sandstone 21 Log traces were scanned from the best 22 available copies of public domain wells. 3000 Bearpaw Shale 18 Most logs are varieties of electrical logs, which have spontaneous potential, resistivity, and conductivity curves. Some wells have caliper and gamma-ray curves on the left and Judith River Formation density porosity and neutron porosity 2000 Abbreviations 15 Claggett Shale on the right. 16 17 SI Shut-in 500 1500 Gammon Shale FP Flow pressure SIP Shut-in pressure All pressures are FSIP Final shut-in pressure reported in pounds Niobrara Formation HP Hydrostatic pressure 300 1000 Perfs. Perforated intervals Carlile Shale 1 MCFGPD Thousand cubic feet of gas per day 200 Bowdoin sandstone Greenhorn Formation 1 MCW Mud cut water 500 Phillips sandstone Belle Fourche Shale Mosby Sandstone Member GCM Gas cut mud 400 100 300 Mowry Shale GCW Gas cut water 50 200 SGCM Slightly gas cut mud 100 Shell Creek Shale 0 0 SGCMW Slightly gas cut muddy water Muddy Sandstone SMCW Slightly mud cut water Skull Creek Shale

SWTR Salt water Basal silt unit of Skull Creek Shale Fall River Sandstone VSGCM Very slightly gas cut mud Kootenai Formation SWCM Salt water cut mud vertical scale: 1 inch = 800 ft 1Of subsurface usage WCM Water cut mud horizontal scale: 1 inch = 10 miles Jurassic rocks KB Kelly bushing vertical exaggeration = x66 GR Ground elevation TD Total depth DST Drill stem test GTS Gas to surface C C' 0 5 10 MILES SOUTH NORTH 28 29 0 5 10 KILOMETERS Hell Creek 35 and Formation 38 Hell Creek Formation 30 32 Hell Creek Formation (incomplete) 27 33 Fox Hills Sandstone Fox Hills Sandstone

36 Bearpaw Shale 34 31 37 Judith River Formation

Claggett Shale

110o 109o 108o 107o 106o 105o 104o Gammon Shale

57 58 54 55 56 51 52 53 Saskatchewan 48 49 50 44 45 46 47 Niobrara Formation 41 42 43 37 38 39 40 32 33 34 35 36 CANADA 28 29 30 31 Montana o 21 22 23 24 25 26 27 37 Carlile Shale 49 111E 12 13 14 15 16 17 18 19 20 Bowdoin dome Greenhorn Formation 36 Mosby Sandstone Member 35 Belle Fourche Shale D' 34 49 Mowry Shale Milk River 33 Fort Peck Indian Reservation Shell Creek Shale Basal silt unit of Skull Creek Shale Harlem 32 Muddy Sandstone 2 13 14 A' Saco B' Havre Skull Creek Shale 12 31 20 B 21 15 16 19 25 26 Fall River Sandstone 48 30 17 Kootenai Formation Malta 18 22 24 Culbertson 6 7 9 10 11 47 23 3 5 46 29 Jurassic rocks 8 A 1 2 Fort Belknap Glasgow Wolf Point Missouri River 4 Bears Paw Mountains Indian 191 45 28 Reservation 2 Rocky Boys 44 27 87 Fort Peck Indian Reservation Little 26 Rocky o Mountains 48 25 Sidney

66 24 43 D Missouri River 23 FORT PECK LAKE D'

22 SOUTH 39 NORTH 21 42 e Circle in Hell Creek l 38 Formation 41 20 41 re 40 o Fox Hills Sandstone 19 h Suffolk 40 Jordan S 42 e nd lin 18 39 ta ore Axis of tr D 38 s h 17 ow Glendive S s L 43 d C' ou n 16 ce Bearpaw Shale ta ta I-94 s ansg 37 re w 15 C o and Mo 36 y 44 45 L ression of Skull Creek rl 14 35 a o s Mosby E 46 47 u Judith River Formation o wr 13 e y sea 34 c Claggett Shale a 12 t 32 33 e r w 11 48 14 49 a 31 C ys Gammon Shale y 10 30 47 l I-94

r

a 87

9 29 Niobrara Formation E ellowstone River 8 Y Musselshell River Carlile Shale 1 28 7 Greenhorn Formation Bowdoin sandstone Mosby Sandstone Member Phillips sandstone1 6 StudyArea Belle Fourche Shale Bull Mountains 5 Mowry Shale

4 Shell Creek Shale Muddy Sandstone 27 3 Skull Creek Shale o Dry hole 46 C 2 Gas-producing well Basal silt unit of Skull Creek Shale I-94 Oil-producing well Fall River Sandstone 1N Unclassified well Kootenai Formation Billings 1Of subsurface usage Jurassic rocks

Base modified from U.S. Geological Survey 1:2,000,000-scale 10 0 10 20 30 40 50 MILES digital line graph data (1980), which was digitized from the 1970 National Atlas of the United States. Township grid modifed from Montana State Library data (1996). 20 0 20 40 60 80 100 KILOMETERS

Universal Transverse Mercator projection, zone 13

Restored stratigraphic diagrams of cross sections A-A', B-B', C-C', and D-D'. Map showing the locations of cross sections in northeastern Montana. Axis of transgression of Skull Creek and Mowry seaways from Dolson and others (1991), lowstand shorelines from Porter and others (1998).

STRATIGRAPHIC FRAMEWORK OF LOWER AND UPPER ROCKS IN CENTRAL AND EASTERN MONTANA By Steven M. Condon 2000