U.S. Geological Survey: Science for a Changing World - USGS visiaul identifier and link to main Web site at http://www.usgs.gov/

Isopach map of the Rockwell Formation in the Maryland-Pennsylvania-West Virginia tristate area. For a more detailed explanation, contact Blaine Cecil at bcecil@usgs.gov
Figure 21. Isopach map of the Rockwell Formation in the Maryland-Pennsylvania-West Virginia tristate area. From Brezinski (1989a). Contour interval is 100 ft.
U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubsdata.usgs.gov /pubs/circ/2004/1264/html/trip3/fig21.html
For more information, contact Blaine Cecil
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