Field Notebook: Minnesota, Wisconsin, Iowa, Illinois, Pennsylvania
Page 15
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
Beena Thompson's quarry and other extending north to the county line. This is in the Trenton Horizon. About one mile S.E. the Salina comes to the surface and is gripped to the depth of a few feet. The shaly layers are quite fossiliferous.