The two end-member models of the facies architecture of alluvial-coastal
plain systems suggest that patterns are either predictable within
unconformity-bounded sequences or that they are substantively overprinted by
autogenic processes. In this
paper, Hampson et al. critically
appraise these end-member models of fluvial stratigraphy using detailed
architectural analysis of sandbodies developed at different positions within a
regressive alluvial-to-coastal plain wedge in the Upper Cretaceous Blackhawk
Formation of Utah. The results illustrate variations in the size and internal
organization of fluvial sandbodies, and the relationship between these
parameters and stratigraphic context; trends are broadly interpreted to reflect
decreasing tectonic subsidence through time, with random distribution of
sandbodies that represent large-scale avulsion (e.g., autogenic) processes. These results can be applied to
enhanced characterization of hydrocarbon reservoirs deposited in fluvial
environments.
Modest Change In Fluvial Style With Varying Accommodation In Regressive Alluvial-To-Coastal-Plain Wedge: Upper Cretaceous Blackhawk Formation, Wasatch Plateau, Central Utah, U.S.A. by Gary J. Hampson, Thomas O. Jewell, Nawazish Irfan, M. Royhan
Gani, and Bryan Bracken
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