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-6- <br />• in exploratory boring;. Only a very general unifonuity was identified in <br />the t4iddle Park Formation and consists of the Suddeth coal bed overlain <br />by 40 feet of clayslone overlain by 30 to 40 feat of a distinct sandstone. <br />Above the relatively distinct sandstone there is interlayered sand~.tunr and <br />clay stone which cannot be separated into identifiable layers. <br />fhe Pierre Shale formation is divided into two memUrrs in the area <br />of which only the Upper Sandy hlenihr.r rras enr,uwrtered within Lhe. project <br />area. The Upper Sandy Memher consists of relatively hard clayey sandstone <br />with in Lerlayered siltstone and shale. <br />Structurally, the f:err 1.1ine is located ,rlnng the Johnny I4oore Syncline <br />with the I4cC.allum Anticline to the west, as shown on Fig. 2 In the area <br />where the open pit is to he exp:uuled, the coal bed sh•ik,~s N1U°I and dips <br />from 3A to 46 degrees to the east. faulting is evident in thN drilling and <br />mi aerial photos. The faulting has a primary strike of P177t°F and a nearly <br />• vertical dip. A vertical displacement of 40 feet eras encountered aL borings <br />IH-7/-1'~ and TII-77-15C. <br />SUUSURFACE CODUITIONS <br />Drilling F'rnrlram <br />Subsurface conditions were investigated by a series of exploratory <br />borings. Initially, nine exploratory borings were drilled to identify <br />suhsoils ar,d Lrdrock, water levels, and to obtain samples for testing. <br />Six borings were cored full depth with MX core erluipuient to identify <br />materials and measure 6eddin9 joints and fracture m•ientations. Three <br />additional rotary borings were drillr.d to identify the depth and thick- <br />ness of coal and determine water levels. Two shallow horings were <br />• <br />