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MIDIICIG ARID RECLr~.P9ATIOM E'L~Ari January 1986 <br />MT. GUCII•IISOI`I 1`IO. 1 f1I1`lE Revised April 1989 • <br />Ceal quality data was assembled from lab~~ratory analyses of <br />core material recovered from the drilling programs. Testing <br />was by Commercial Testing and Engineering Laboratories in <br />Denver, Colorado. <br />2.7.2 Stratiaraphy <br />Introduction <br />The general geology of tYris portion of the southeast Piceance <br />Basin consists of gently north-northeast dipping beds of <br />sandstone, shale, and coal of Upper Cretaceous and early <br />Tertiary age. The main coal beds are found in the Upper <br />Cretaceous Mesa Verde Group which is overlain by the early <br />Tertiary Ohio Creek Conglomerate and underlain by the upper <br />cretaceous Mancos Shale. Locally, the Mesa Verde is about <br />2,500 feet thick. A generalized stratigraphic column is shown <br />in Figure 2.7.2.A. Exhibit 2.7.1.AA is a geologic map of the <br />lease area. This map shows the coal outcrop line and strike <br />and di.p foC the F seam. It has been modified after V.H. <br />Johnson"s 1949 geologic map. He placed t?ie top of the Upper - <br />Coa1 Plember above the F seam; however, ARCO coal does not agree <br />with this interpretation and uses the top of the F seam as the <br />top of tiie member. <br />These structural-stratigraphic 'cross sections (Exhibits <br />2.7.2.D, E and F) have been constructed to show the subsurface <br />geology t}iroLrgh the mine lease and have been updated to reflect <br />structural interpretations based on drilling up to 198.5. <br />Exhibit 7..7.2.D (Cross-section A-A") crosses the entire lease <br />from north to south, Exhibit 2.7.2.E (Cross-section B-B") <br />crosses the first 5-year Mine Plan permit P.rea from east to <br />west, and Exhibit 2.7.2.F (Cross section C-C") is another <br />east-west section which is located south of Exhibit 2.7.2.E. <br />characteristic lithologic logs and 'geophysical logs have been <br />included for core holes SOM 36, SOM 47, SOM 65, SOM 6, SOiH 17, <br />SCM 35-35A, SOM 38, SOM 41 and SOf~I 42; these are Exhibits <br />2.7.2.A thro~~~l~. 2.7.2.C.1 and 2.7.2.G tliro~.rgh 2.7.2.L.1. <br />Geophysical logs only have been inclLrded for core ]soles SOM 2, <br />SOP' S0 and SOM 59; these are Exhibits 2.7.Z M through 2.7.2.P. <br />• <br />2 -284 ~ <br />.• <br />