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• Exhibit <br />Lith Type Codes <br />Code Lithologic Meaning <br />SS Sandstone <br />SH Shale <br />SI Sandstone, interbedded <br />SL Siltstone <br />CL Clay <br />SO Soil <br />RD Re-deposited or recently deposited <br /> material, talus, regolith, etc.; <br /> usually soft <br />AL Alluvium: sand, gravel, cobbles, <br /> boulders or other stream-laid <br /> deposits <br />CO Coal <br />CW Weathered Coal <br />BC Boney Coal <br />BO Bone <br />CS Carbonaceous Shale <br />FC Fire Clay <br />SE Sandy Shale <br />• FG Fault Gouge <br />VX Volcanic deposits; basalt, ash, etc. <br />ML Miscellaneous Lithology <br />WR Weathered (soft) Original Rock <br />UK Unknown Lithology <br />• <br />