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Campanian Shannon Sandstone: An Example of a Falling Stage Systems Tract Deposit

By
Katherine M. Bergman
Katherine M. Bergman
Department of Geology, University of Regina, Regina, SK S4S 0A2, Canada.
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Roger G. Walker
Roger G. Walker
Department of Geology, McMaster University, Hamilton, ON L8S 4M1, Canada
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Published:
January 01, 1999

Abstract

Recent interpretations of the lower Campanian Shannon Sandstone in the Powder River Basin, Wyoming have suggested that it was deposited in incised shorefaces of the falling stage and lowstand systems tracts rather than in offshore stacked shelf ridge complexes. A complete high resolution stratigraphic analysis of the Shannon requires that outcrops in the Bighorn and Powder River Basin be correlated with subsurface fields basinward. In the Hartzog Draw area where there is good core control, a consistent pattern of facies and erosion surfaces can be defined. From this pattern a template was constructed that could be used to interpret depositional patterns in uncored areas. The template consists of a regressive surface of erosion (RSE) that forms the base of an incised shoreface sandbody and a transgressive surface of erosion (TSE) that truncates the top of the sandbody and the RSE. Applying the template to the cross section suggests that six progradational successions and six transgressions can be defined within the Shannon. Positions of the RSEs and TSEs allow estimates of the magnitude of relative sea level fluctuations that controlled Shannon deposition (a few meters to 60 m). The correlations are consistent with the interpretation of the Shannon as incised shoreface sandbodies of falling stage and lowstand systems tracts, separated by mudstone deposits of the following transgressive systems tract.

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SEPM Special Publication

Isolated Shallow Marine Sand Bodies: Sequence Stratigraphic Analysis and Sedimentologic Interpretation

Katherine M. Bergman
Katherine M. Bergman
Department of Geology University of Regina Regina SK S4S OA2 Canada
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John W. Snedden
John W. Snedden
Mobil Exploration & Producing Technical Center PO Box 650232 Dallas TX 75265USA
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SEPM Society for Sedimentary Geology
Volume
64
ISBN electronic:
9781565761865
Publication date:
January 01, 1999

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