Lehman, David; Pope, John K. (1989). "Upper Ordovician Tempestites from Swatara Gap, Pennsylvania: Depositional Processes Affecting the Sediments and Paleoecology of the Fossil Faunas". PALAIOS. 4 (6): 553–564. Bibcode:1989Palai...4..553L. doi:10.2307/3514745. JSTOR3514745.
Lehman, David; Pope, John K. (1989). "Upper Ordovician Tempestites from Swatara Gap, Pennsylvania: Depositional Processes Affecting the Sediments and Paleoecology of the Fossil Faunas". PALAIOS. 4 (6): 553–564. Bibcode:1989Palai...4..553L. doi:10.2307/3514745. JSTOR3514745.
jstor.org
Lehman, David; Pope, John K. (1989). "Upper Ordovician Tempestites from Swatara Gap, Pennsylvania: Depositional Processes Affecting the Sediments and Paleoecology of the Fossil Faunas". PALAIOS. 4 (6): 553–564. Bibcode:1989Palai...4..553L. doi:10.2307/3514745. JSTOR3514745.
Harris, L.D., 1965, Geologic map of the Wheeler quadrangle, Claiborne County, Tennessee, and Lee County, Virginia: U.S. Geological Survey Geologic Quadrangle Map, GQ-435, 1 sheet, scale 1:24,000 http://ngmdb.usgs.gov/Prodesc/proddesc_903.htm