High-resolution sequence stratigraphic analysis of the Shannon sandstone in Wyoming, using a template for regional correlation

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. From the cross sections, six progradational events and six transgressions have been defined during Shannon time. The positions of the RSEs and TSEs allow estimates of between a few meters and 60 m for the magnitude of sea level fluctuations that controlled Shannon deposition. The proposed correlations confirm and reinforce the interpretation of the Shannon as a series of incised shoreface sandbodies, separated by transgressive systems tract mudstone deposits. -from Authors