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<br />• 69ancos Shale <br /> <br />The A?ancos shale confox•~rably overlies the Dakota sandstone and <br />is approximately 2000 feet thick. It consists of dark gray to black <br />shale and silty to finely sandy shale with small amounts of dark-gray <br />argillaceous limestone in lenses and concertions which weather to a <br />bright yellow brown color. <br />Foint Lookout Sandstone <br />The Fbint Lookout sandstone is the basal foxtnation of the ~?esa <br />Verde Group in the Hesperus area. In this report, the Ibint Lookout <br />sandstone is dividEd into twv members: a lower menber node up of thin <br />sandstone beds with interbedded shale that ccxnprises a transitional <br />sequence above the \fancos shale; and an upper ittassive sandstone mErrt>er <br />consisting of thick, massive Zeds of even-textured, medium-grained <br />• sandstone that foam conspicuous cliffs in the northern portion of the <br />pirojecL area. <br />The Point Lookout sandstone is reported to imintain a rather <br />uniforni thicimess of about 400 feet across the Hesperus area, but the <br />sandstone bads at any given horizon become progressively finer grained <br />Eastward and the lower merrier thickens at the expense of the ~~ sive <br />sandstone rr~nber. In the project area, the massive sandstone member of <br />marine origin is about 1G0 feet thick and the lower transitional ireuier <br />is about :SOU feet thick. <br />- J - <br />l I <br />