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The AAPG/Datapages Combined Publications Database

Four Corners Geological Society


Natural Fracture Systems in the Southern Rockies, 1999
Pages 77-83

Preliminary Results of Coal Cleat Studies, Upper Cretaceous Ferron Sandstone Member of the Mancos Shale, Emery and Sevier Counties, Utah

Steven M. Condon


Orientation data on cleats in coal from the Ferron Sandstone Member of the Mancos Shale were collected at 30 sites in Sevier and Emery Counties, Utah. Orientations were recorded from the sub-A, A, C, G, I, I-2, and thin upper Ferron coals. More than 400 orientations were recorded, revealing a preliminary picture of the cleat trends in this area (no measurements were made on joints in sandstone). Face and butt cleats were readily defined and measured at each of the stations. Cleat data plotted together have two main orientations, which are northwest and northeast. However, when face and butt cleats are plotted separately there is an overlap of orientations; some face cleats trend northwest and some trend northeast. A similar overlap occurs for butt cleats. In general, the majority of face cleats trend northwest and the majority of butt cleats trend northeast. When plotted stratigraphically, face cleats trending northwest occur throughout the section in the southern part of the study area, and occur in stratigraphically low coal beds in the central and northern parts of the study area. Northeast-oriented face cleats are most common in stratigraphically high coal beds in the central and northern parts of the study area. The divergent face cleat orientations may be due to the study area location at the boundary between the Basin and Range province and the Colorado Plateau province.

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