Geologic Unit: Tumbling Run
Tumbling Run Formation of Pottsville Group (PA)
Tumbling Run Member of Pottsville Formation (PA*)
Type section: Same as basal part of Pottsville Formation reference section in roadcut on east side of U.S. Highway 122, about 150 feet farther east that original type section of Pottsville which is on eastern side of Pennsylvania Railroad cut through water gap south of Pottsville, Schuylkill Co., PA (Wood and others, 1956).
Unit Name History:
Named (Wood and others, 1956). Revised to formation (Gray, 1960).
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Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.
"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().
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U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
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Last modified: 15-Jan-2013