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TABLE 2.7-1. STRATIGRAPHY OF THE t'IINE PLAN AND ADJACENT AREAS <br />Estimated <br />System Formation htember Thickness Li[hology <br />Quaternary Alluvium - Variable Sands and gravels <br />~~ with some silts <br />and clays <br />Cretaceous Lewis -L 1500- Mainly dark gray <br />Shale 1900 ft. marine shales and <br />sandy shales with <br />minor sandstones <br />Cretaceous Williams Fork Upper Williams 680+ ft. Interbedded shales, <br />(Mesa Verde Fork sandy shales and <br />Group) coal seams; con- <br />tains several white <br />sandstones; <br />variably thin to <br />thick bedded <br />Twenty Mile 100+ ft. Massive cliff <br />Sandstone forming <br />quartzose <br />sandstone <br />i~ <br />Lower Williams 920+ ft. Interbedded <br />Fork soft sandstones <br />sandy shales <br />carbonaceous <br />shales and <br />coal seams; <br />and clinker zones <br />Cretaceous Iles Formation Trout Creek <br />(Mesa Verde Sandstone <br />Group) <br />Main Body <br />_~. <br />Cretaceous Mancos Shale <br />100+ ft. Massive white <br />sandstone, <br />cliff former <br />1300+ ft. Mainly sandstone <br />with interbedded <br />subordinate <br />shales <br />4000+ ft. Gray homogeneous <br />marine shales <br />2-350 <br />