Field Notebook: Minnesota, Wisconsin, Iowa, Illinois, Pennsylvania
Page 41
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
of about two feet thickness has formed. I understand from miners that all the cleviers form a horizontal deposit at this level. Lead is called by the miners mineral; zinc glend = Hack Jack; carbonate or smithsonite of zinc = dry bone. This dry bone is used exclusively at the zinc factory in making oxide of zinc for paints.