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per•rnit area. These deposits are prirnar•ily poorly sorted, <br />• unconsolidated sands and gravels. <br />Marcos Shale. The Marcos Shale, which or_ttcrops <br />approximately ~.5 rniles rior•theast cif the per•rrtit area, <br />cor~for•r~ta6ly ~~ver•1>es the Dalt~~ta Sar~dstc~r~e ar~d has a l~~cal <br />average thickness of c~rUlt feet. It consists of dark-gray tc~ <br />black rnar•ir~e shale ar~d silty t~~ finely-sandy shale wrth <br />small arno~.irits of ar•gillaceo~_is lr.rnestc~r~e ire lenses ar~d <br />cnr~cr•eat i ~ ~r~s. <br />F'~~ir~t Looko~_tt Sar~dstorie. The F'oir~t l_ooko~_tt Sar~dstor~e is the <br />basal forr~tatior~ of the Mesa Verde Gr•o~_tp. The for•rnatic~ri is <br />generally divided into two members: a lower rnernber• made up <br />• of thin sar~dstor~e beds with ir~ter•bedded shale, cornpr•r.sir~g a <br />tr•ansitiori seq~.ter~ce with the ~_rr~der•lyir~y Marcos Shaleq ar~d an <br />upper massive sandstone rnernber cornposed of thick, massive <br />beds of even-text~_tred, medi~_rm-grained sandstone that form <br />conspicuo~.rs cliffs several rniles north and northeast of the <br />per•rnit area. <br />The F'oir~t L~=~okc~~_tt Sar~dstor~e has are average local thickness <br />of 4r_tri feet. The 1~_~wer• tr•ar~siti~_~r~al r~ternber• is abo~.rt 3~t~t <br />feet thick while the massive sandstone rnernber is abo~_rt 10it <br />feet thick. <br />Menefee F~~r•r~tatic~n. The Menefee For•rnatic~r~ is the middle <br />for•rnatior~ of the Mesa Verde Group ar~d is cornposed cif a <br />• complex assern6lage ~f lentic~_rlar, cress-bedded sandstone, <br />"it4-Il> <br />