RI-35 Middle and Late Ordovician Lithostratigraphy and Biostratigraphy of the Upper Mississippi Valley

Sloan, Robert E.2010-04-202010-04-201987Sloan, R.E., 1987, Middle and Late Ordovician Lithostratigraphy and Biostratigraphy of the Upper Mississippi Valley, Minnesota: Minnesota Geological Survey Report of Investigations 35, 232 p.0076-9177https://hdl.handle.net/11299/60756en-USRI-35 Middle and Late Ordovician Lithostratigraphy and Biostratigraphy of the Upper Mississippi ValleyReport