Results: 1 - 3 of 3
Jan 08, 1973
Open File Report
… building stone, quartzite, and shale - potentially the base for a … to 1956, plus some quarrying of shale and limestone. By far the …
Dec 31, 1957
Earth Sciences Report
Feb 29, 2008
Special Report
… by at least one contiguous thick shale sequence, the Smoky Group. …