Figure 25. Photograph of part of an exposed coal bed showing
well-developed face cleat and poorly developed butt cleat. The
coal bed is in the Cretaceous Fruitland Formation in the San Juan
basin, near Durango, Colo. The compass is 2.75 in. wide.
Photograph by Walter Ayers (S.A. Holditch Assoc., Inc., College
Station, Tex.) in Atlas of Coal Geology, American Association of
Petroleum Geologists (AAPG) Studies in Geology No 45 (Papp
and others, 1998); AAPG copyright 1998, reprinted by permission
of the AAPG, whose permission is required for further use.
U.S. Department of the Interior, U.S. Geological Survey
For more information, contact Stanley Schweinfurth
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