--> Abstract: Facies and Architectural Analysis of the Upper Cretaceous Ferron Sandstone in the Western Henry Mountains, South-Central Utah, by Christopher Fielding; #90078 (2008)

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Facies and Architectural Analysis of the Upper Cretaceous Ferron Sandstone in the Western Henry Mountains, South-Central Utah

Christopher Fielding
Department of Geosciences, University of Nebraska-Lincoln, Lincoln, NE

Outcrop-based analysis of the Upper Cretaceous (middle to upper Turonian) Ferron Sandstone west of the Henry Mountains, south-central Utah, reveals that it records progradation of a series of river-dominated, wave-influenced delta lobes eastward into the Western Interior Seaway. In this work, stratal packages have been correlated over c. 30 km from Caineville township on Utah Highway 24 southward (obliquely along depositional strike) to Blind Trail, and over another section of c. 5 km further south at The Post. The lower half of the Ferron Sandstone comprises crudely thickening- and coarsening-upward intervals 2-10 m thick, recording progradation of the subaqueous portions of delta lobes into the region. Individual parasequences, and even individual beds <1 m thick, can be physically correlated over several km along strike, implying considerable lateral continuity of sands in the strike direction. In contrast, facies changes occur in the depositional dip direction over much shorter distances. The upper half of the Ferron Sandstone comprises a stack of erosionally-based channel sandstone bodies, with subordinate overbank mudrocks and thin carbonaceous shales or coals. Bases of some of these bodies are regionally significant erosion surfaces, and may represent sequence boundaries. Similarity in lithofacies, stacking patterns, and sediment body geometry, including presence of sharp-based mouth bar sandstones, suggests an analogy with the modern Burdekin River Delta of NE Australia, the Holocene delta of which was also constructed as a series of overlapping lobes. Vertical thicknesses of facies in the Ferron and Burdekin Deltas are closely comparable, suggesting that the latter may be an effective analog for subsurface hydrocarbon reservoirs in the Ferron Sandstone in this region.

 

AAPG Search and Discovery Article #90078©2008 AAPG Annual Convention, San Antonio, Texas