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

Stratigraphic section of the Mississippian-Pennsylvanian unconformity along Interstate 68 at Exit 15. For a more detailed explanation, contact Blaine Cecil at bcecil@usgs.gov Figure 17. Stratigraphic section of the Mississippian-Pennsylvanian unconformity along Interstate 68 at Exit 15. See figure 11 for explanation of lithology symbols.
U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubsdata.usgs.gov /pubs/circ/2004/1264/html/trip3/fig17.html
For more information, contact Blaine Cecil
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