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.