REMARKS: A large outcrop of sandstone (Cuyahoga Group, Mississippian age) forms a sloping, flat bedding surface facing the river; early Indians carved figures on the face of the rock. Carvings represent their tribes, birds, and animals of the region.
REFERENCES: Swauger, J. L. (1977), The Indian God Rock Petroglyph Site 36VE36, Pennsylvania Archeologist, v. 47, no. 1, p 1-13.
REMARKS: Oil from seeps along Oil Creek was collected by the Indians and early settlers to be used as medicine. An oil spring was first described in 1753. In 1859 the Drake Well along Oil Creek was the world's first well drilled for oil. A replica of the Drake Well may be seen at Drake Well State Park, Titusville. Large and numerous outcrops of flat-lying greenish-gray siltstones (Riceville Formation, Late Devonian age) are present near Petroleum Center.
REFERENCES: Pennsylvania Bureau of Statistics, Pennsylvania Bureau of Topographic and Geologic Survey, and the Pennsylvania State University (1944), Pennsylvania's Mineral Heritage, Pennsylvania Department of Internal Affairs, Harrisburg, 248 p.
Pennsylvania Geological Survey (1959), Field Trip B, Bedrock and Oil Geology of Northwestern Pennsylvania and the Great Oildorado, in Guidebook, 24th Annual Field Conference of Pennsylvania Geologists, Pennsylvania Geological Survey, p. 36-58.