Pfannehecker, D.Includes color cross section.D. Pfannehecker.Scale 1:2,250,000.TIFFhttps://hdl.handle.net/1811/33054978-5350-419b-96e5-79e176e13ca5engOhio. Division of Geological SurveyPublicGeologyGeologic map and cross section of OhioMapsOhioThe Ohio State University