Mine Sections - Area2 (cont) Station 68. QS. section Black shale - marine fossils Coal ------- 20 Shale 74. U.S.G.S. section Black shale roof Heading N 60° E Boney coal ------- 44 Gray silty claystone bottom. 75. U.S.G.S. Section Grey silty claystone roof Coal, bone & shale ------- 13 RIDER. Darkgray to black silty claystone - 10 Fine grained sandstone ------- 20 Dark gray to black silty claystone - 9 Coal ----------------------- 20 FREEPORT. Claystone bottom. 79. QS. section Shale roof Coal ------- 25 clayey bottom.. 80. QS. section Shale roof Coal ------- 26 Clayey bottom