Stratigraphic overview of upper Cretaceous (early Campanian-Late Maestrichtian) Montana Group, Powder River basin, Wyoming: implications for complex interplay between eustatic sea level fluctuations, sedimentation rates, and intraforeland basin subsidence
Isopach maps of chronostratigraphic and lithostratigraphic units from the Late Cretaceous (early Campanian-late Maestrichtian) Montana Group of the Powder River basin, Wyoming, reveal a complex interplay between eustatic sea level fluctuations, sedimentation rates, and intraforeland basin subsidence rates. The Montana Group is characterized by numerous asymmetrical, coarsening- and thickening-upward, progradational deltaic, strand-plain, and/or shallow-marine deposits that thin eastward and merge into thick offshore-marine and pelagic deposits on the Pierre Shale. From oldest to youngest these are the Gammon, Shannon, and Sussex Members of the Steele Shale, the Parkman and Teapot Sandstone Members of the Mesaverde Formation, the Teckla Sandstone Member of the Lewis Shale, and the Fox Hills Sandstone. Formation tops and bentonite beds from approximately 30,000 well logs were correlated throughout the Powder River basin and adjacent areas.
- Research Organization:
- RPI International, Inc., Boulder, CO (USA)
- OSTI ID:
- 6119773
- Report Number(s):
- CONF-890404-
- Journal Information:
- AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States), Vol. 73:3; Conference: AAPG annual convention with DPA/EMD Divisions and SEPM, San Antonio, TX, USA, 23 Apr 1989
- Country of Publication:
- United States
- Language:
- English
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