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Abstract
Journal of Sedimentary Research, Section
B: Stratigraphy and Global Studies
Vol. 65B (1995)No.
2. (May), Pages 255-264
High-Resolution Sequence Stratigraphic Analysis of the Shannon Sandstone
in Wyoming, Using a Template for Regional Correlation
Katherine M. Bergman (*), Roger G. Walker
ABSTRACT
Recent interpretations of the lower Campanian Shannon Sandstone in the
Powder River Basin, Wyoming have suggested that it was deposited in falling
stage and lowstand incised shorefaces, rather than in stacked shelf ridges
up to 160 km from shore. Despite these detailed studies, there is no published
correlation of the outcrop deposits at Salt Creek Anticline with the subsurface
deposits in the Hartzog Draw-Heldt Draw (HD-HD) area. A complete high-resolution
sequence stratigraphic analysis of the Shannon requires that the outcrops
at Salt Creek be correlated with the subsurface fields at HD-HD. There
is little core control in the approximately 30 km between these areas,
so correlations are based almost entirely on well logs. A template has
been constructed in the HD-HD area, where ther is good core and well log
control, which embodies data from facies, facies successions, well log
signatures, and bounding discontinuities. 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. Two cross sections have been constructed, and
the template has been used to guide correlations between Salt Creek and
the HD-HD area.
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.
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