Keywords: Tuscarora2.jpg en Sample of Silurian Tuscarora Formation collected from Bald Eagle Mountain Centre County Pennsylvania showing Diplocraterion trace fossil at left Specimen is ~22cm high 2007-4-2 Own <br />Transferred from http //en wikipedia org en wikipedia Jstuby at http //en wikipedia org en wikipedia en wikipedia Jstuby Original upload log page en wikipedia Tuscarora2 jpg 2007-04-02 20 09 Jstuby 400×458 115491 bytes <nowiki>Sample of Silurian Tuscarora Formation collected from Bald Eagle Mountain Centre County Pennsylvania showing Diplocraterion trace fossil at left Specimen is ~22cm high </nowiki> Silurian geology Sandstone Shale Geologic formations Geology of Maryland Geology of Pennsylvania Siltstone Geology of Virginia Geology of West Virginia Stratigraphy Trace fossils |