U.S. Geological Survey: Science for a Changing World - USGS visiaul identifier and link to main Web site at http://www.usgs.gov/
Photograph of a peat bed in Indonesia A Photograph of San Miguel lignite beds of Eocene age in a coal strip mine in Texas B
Photograph of subbituminous coal strip mine in the Paleocene Anderson-Wyodak coal zone, Powder
        River basin, Wyoming C Photograph of geologists examining a roadcut exposing the bituminous Pennsylvanian Pittsburgh coal bed, near Morgantown,
        W. Va. D
Figure 7. Photographs showing examples of peat and coal beds. A, Peat bed in Indonesia. The face is approximately 3 ft high. Note heterogeneous plant material in a finer groundmass of peat. At this location, the peat bed is approximately 20 ft thick and 5,000 yrs old at the base. Photograph by S.G. Neuzil (U.S. Geological Survey). B, San Miguel lignite beds of Eocene age in a coal strip mine in Texas. The individual beds of lignite (dark) are interspersed with beds of volcanic ash (lighter). The original peat has been compressed into a relatively homogeneous, evenly bedded material, but it still has a dull luster. Photograph by P.D. Warwick (U.S. Geological Survey). C, Subbituminous coal strip mine in the Paleocene Anderson-Wyodak coal zone, Powder River basin, Wyoming. This bed is approximately 100 ft thick at this location, and is divided into two 50-ft-thick sections by the light-colored sedimentary rock parting above the power shovel. Photograph by P.D. Warwick (U.S. Geological Survey). D, Roadcut exposing the bituminous Pennsylvanian Pittsburgh coal bed, near Morgantown, W. Va. The normal lustrous, black appearance of this coal has been dulled by exposure to the weather. Photograph by C.B. Cecil (U.S. Geological Survey).


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