Keywords: Tuscarora1.jpg Tuscarora Formation in Thickhead Mountain Wild Area Rothrock State Forest Centre County Pennsylvania Rock hammer for scale Photo taken in late 1990's Own Jstuby at http //en wikipedia org en wikipedia Jim Stuby 40 44 05 N 77 46 42 W source enwiki-plaintext-parser_region US-PA en wikipedia Jstuby Original upload log page en wikipedia Tuscarora1 jpg 2007-04-02 14 22 Jstuby 768×512 80605 bytes <nowiki>Photo of outcrop of Tuscarora Formation located at 40 deg 44' 05 N 077 deg 46' 42 W in Thickhead Wild Area Centre County Pennsylvania Photo taken and uploaded by James Stuby M S P G in late 1990's Rock hammer for scale </nowiki> Silurian geology Sandstone Shale Geologic formations Geology of Pennsylvania Siltstone Stratigraphy Rocks with objects for scale Rock hammer Rock formations in Pennsylvania |