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~• <br />C~ <br /> <br />• Lewis S}~ale <br />The Lewis Shale conformably overlies the Cliff Flouse sandstone <br />and consists of dark gray to black almost hameeneous clay shale with <br />scattered concretions of dense argillaceous limestone and with a few <br />ti~in seams of bentonite in the upper part. The formation is reported to <br />be about 1825 feet thick with the basal contact being very sharp with <br />black flaky clay-shale resting on gray mudstone or sand shale of the <br />Cliff House sandstone. <br />577tUC1UFtF <br />1'he geologic structure of the Hesperus area is characterized <br />by gentle southward dips ranging from seven to two degrees away from the <br />structurally high La Plata Mountains to the north. It is probable that <br />a small amount of faulting is present in the vicinity of the Town of <br />• Hesperus. A fault with a displacement of 33 feet has been reported in <br />the old Hesperus mine in Section 14, T.35N., P..11W. Another fault, <br />downtlnrown 30 feet to the east, has been reported in t}~e Slonar~h mine <br />about one mile northeast of Hesperus. Results of exploration drilling <br />conducted in the area gave not revealed significant faulting. <br />SUFtF'AC1; GilO11JGY <br />Only the upper two members of the Mesa Verde Group are exposed <br />on the property. The tAine is located on the south side of Flay Gulch on <br />and with entries driven into the coal bearing Menefee Formation. The <br />Cliff tlousi; Formation caps the higher grround on both sides of the F,vlch. <br />- 6 - <br />• <br />