Results: 1 - 3 of 3
Oct 16, 2014
Open File Report
… of the lower Clearwater shale unit, that overlay the … where the lower Clearwater shale unit is thin (<5 m thick) or … study area, the lower Clearwater shale was found to be between 20 …
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