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Subsurface Stratigraphic Cross Sections Showing Correlation of Cretaceous and Lower Tertiary Rocks in the Bighorn Basin, Wyoming and Montana: U.S

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Subsurface Stratigraphic Cross Sections Showing Correlation of Cretaceous and Lower Tertiary Rocks in the Bighorn Basin, Wyoming and Montana: U.S Chapter 6 Subsurface Stratigraphic Cross Sections Showing Correlation of Cretaceous and Lower Tertiary Rocks in the Bighorn Basin, Click here to return to Wyoming and Montana Volume Title Page By Thomas M. Finn Chapter 6 of Petroleum Systems and Geologic Assessment of Oil and Gas in the Bighorn Basin Province, Wyoming and Montana By U.S. Geological Survey Bighorn Basin Province Assessment Team U.S. Geological Survey Digital Data Series DDS–69–V U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Marcia K. McNutt, Director U.S. Geological Survey, Reston, Virginia: 2010 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Finn, T.M., 2010, Subsurface stratigraphic cross sections showing correlation of Cretaceous and lower Tertiary rocks in the Bighorn Basin, Wyoming and Montana: U.S. Geological Survey Digital Data Series DDS–69–V, 14 p. ISBN: 1–4113–2667–5 iii Contents Introduction.....................................................................................................................................................1 Stratigraphy ....................................................................................................................................................6 Lower Cretaceous Rocks ....................................................................................................................6 Cloverly Formation .......................................................................................................................6 Thermopolis Shale .......................................................................................................................6 Muddy Sandstone ........................................................................................................................6 Upper Cretaceous Rocks .....................................................................................................................6 Mowry Shale.................................................................................................................................6 Frontier Formation........................................................................................................................8 Cody Shale ....................................................................................................................................8 Mesaverde Formation .................................................................................................................8 Meeteetse Formation, and Lewis and Bearpaw Shales .......................................................9 Lance Formation...........................................................................................................................9 Paleocene Rocks ................................................................................................................................10 Fort Union Formation .................................................................................................................10 Lower Eocene Rocks ..........................................................................................................................10 Willwood and Tatman Formations, undivided .......................................................................10 Acknowledgments .......................................................................................................................................10 References ....................................................................................................................................................10 Figures 1. Map of the Rocky Mountain region showing Laramide basins ............................................2 2. Index map of the Bighorn Basin .................................................................................................3 3. Stratigraphic chart of Cretaceous and lower Tertiary rocks ................................................4 4. Index map of the Bighorn Basin showing the network of cross sections ..........................5 5. Regional stratigraphic cross section of Cretaceous and Paleocene rocks ...................................................................................................................7 Plates 1–6. Stratigraphic sections showing correlation of Cretaceous through lower Tertiary rocks 1. Cross section A–A’ along the Nye-Bowler lineament ................................................... link 2. Cross section B–B’ from the Beartooth Mountain front to the Whistle Creek anticline .................................................................................................. link 3. Cross section C–C’ from the Heart Mountain gas field to Emblem gas field ............ link 4. Cross section D–D’ from the Oregon Basin anticline to Greybull ............................... link 5. Cross section E–E’ from the Grass Creek anticline to the Five Mile trend ................. link 6. Cross section F–F’ from Montana to the southeastern margin of the Bighorn Basin Sheet 1 of 2 ........................................................................................................................ link Sheet 2 of 2 ........................................................................................................................ link Subsurface Stratigraphic Cross Sections Showing Correlation of Cretaceous and Lower Tertiary Rocks in the Bighorn Basin, Wyoming and Montana By Thomas M. Finn Introduction available, and are shown as a long, heavy black bar on the depth track of each log. The heavy black bars representing coal beds only show the position of the coal bed(s) and are not The stratigraphic cross sections presented in this report proportional to true thickness. In addition to the stratigraphic were constructed as part of a project conducted by the U.S. Geological Survey (USGS) to characterize and evaluate the information, oil and gas shows, oil- and gas-producing undiscovered oil and gas resources of the Bighorn Basin intervals, perforated intervals, and drillstem test intervals (BHB) in north-central Wyoming and south-central Montana are also shown on the cross sections. This information was (fig. 1). The primary purpose of the cross sections is to show compiled from IHS Energy Group (2008) well data, the the stratigraphic framework and facies relations of Cretaceous Wyoming Oil and Gas Conservation Commission Web site and lower Tertiary rocks in this intermontane sedimentary (2008), and drilling reports in the USGS well log files. and structural basin, which formed in the Rocky Mountain The locations of the six stratigraphic cross sections are as foreland during the Laramide orogeny (Late Cretaceous follows (fig. 4): through early Eocene time). The BHB is nearly 180 mi long, • Section A–A´ extends for about 26 mi along the Nye- 100 mi wide, and encompasses about 10,400 mi2. The basin is Bowler lineament (pl. 1). structurally bounded on the northeast by the Pryor Mountains, on the east by the Bighorn Mountains, and on the south by the • Section B–B´ extends for 30 mi southeast from the Owl Creek Mountains. The northern margin includes a zone Beartooth Mountain front to the southwest flank of faulting and folding referred to as the Nye-Bowler linea- of Whistle Creek anticline (fig. 2) on the northeast ment (Wilson, 1936). The northwestern and western margins margin of the basin (pl. 2). are formed by the Beartooth Mountains and Absaroka Range, • Section C–C´ extends nearly east-west about 40 mi respectively (fig. 2). from Heart Mountain gas field to Emblem gas field The cross sections were constructed from borehole (fig.2) (pl. 3). geophysical logs of 62 wells drilled for oil and gas explora- tion and production. The stratigraphic interval extends from • Section D–D´ extends from near the southern end of the base of the Cretaceous into the lower Eocene (fig. 3). the Oregon Basin anticline for about 50 mi to near The datum for all sections is the top of the Teapot Sandstone the Greybull oil field (fig. 2) on the eastern margin of Member of the Mesaverde Formation or equivalent strata. This the basin (pl. 4). datum was selected because it is easily identified on most well logs and is present throughout the basin. • Section E–E´ extends from near the southeast end of In most wells, a gamma-ray or spontaneous-potential Grass Creek anticline northeast about 40 mi to near log was used in combination with a resistivity or conductivity the southern end of the Five Mile trend (fig.2) (pl. 5). log to identify and correlate units. The gamma-ray and • Section F–F´ extends approximately 130 mi south- spontaneous-potential logs are typically used to differentiate between sandstone and shale; however, in the Bighorn Basin east from the Nye-Bowler lineament, through the the spontaneous-potential response is typically subdued in the
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