The Logan Formation was named by Andrews (1870) and originally described as a "buff-colored, fine-grained sandstone" above the Waverly Formation and below the Maxville Limestone. Bork and Malcuit (1979) concluded that the Logan Formation was deposited on a shallow marine shelf in a generallytransgressing sea. The age of the Logan Formation has been established as early Osagean (Tn3) by the occurrences ofbrachiopods,ammonoids,conodonts and miospores (Clayton et al., 1998; Matchen and Kammer, 2006).
Andrews, E.B. (1870). "Report of progress in the second district, Part II, IN Report of progress in 1869".Ohio Division of Geological Survey Report of Progress. 2nd Series:1091–1094.
Bork, K.B.; Malcuit, R.J. (1979). "Paleoenvironments of the Cuyahoga and Logan Formations (Mississippian) of central Ohio".Geological Society of America Bulletin.90:89–113.doi:10.1130/0016-7606(1979)90<1091:potcal>2.0.co;2.
Matchen, D.L.; Kammer, T.W. (2006). "Incised valley fill interpretation for Mississippian Black Hand Sandstone, Appalachian Basin, USA: Implications for glacial eustacy at Kinderhookian-Osagean (Tn2-Tn3) boundary".Sedimentary Geology.191:89–113.Bibcode:2006SedG..191...89M.doi:10.1016/j.sedgeo.2006.02.002.
Conglomerate in the Logan Formation exposed in Wooster, Ohio, USA.
Brachiopod internal and external molds in the Logan Formation in Wooster, Ohio.
