Results: 1 - 3 of 3
Jan 23, 2020
Data
… quartzite, other stones, clay, shale, salt, potash, gypsum, sodium …
Dec 31, 1973
Earth Sciences Report
… gravel, coarse sand, till, clay, shale, fine sand, silt and … erosion; 8)avoiding terracing of shale and mudstone slopes which …
Feb 29, 2008
Special Report
… by at least one contiguous thick shale sequence, the Smoky Group. …