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?J APPROX. <br />AGE FORMATION NAME GENERAL DESCRIPTION THICKNESS <br /> IN FEET <br /> <br /> SANDSTONE-Coarse to conglomeratic beds 13-50 feet <br /> POISON CANYON thick. Interbeds of soft, yellow-weathering clayey % <br /> sandstone. Thickens to the west at expense of 0-2,500 <br /> FORMATION underlying Raton Formation <br /> w <br />? Z Formation intertongues with Poison Canyon Formation . <br /> <br />w <br />to the west - <br /> U _ <br /> O UPPER COAL ZONE-Very fine grained sandstone, 600-1,100 <br />CE w siltstone, and mudstone with carbonaceous shale <br />w ¢ and thick coal beds 0-2,440 <br /> a_ RATO N <br /> FORMATION <br /> BARREN SERIES-Mostly very fine to fine grained <br /> sandstone with minor mudstone, siltstone, with 180-600 <br /> carbonaceous shale and thin coal beds <br /> LOWER COAL ZONE-Same as upper coal zone; coal SKIT B <br />d <br /> <br />b <br />d <br />tl <br />thi <br />d di <br />ti <br />C <br />l <br />ti oun <br />ary <br /> ? e <br />s mos <br />y <br />n an <br />scon <br />nuous. <br />ong <br />omera <br />c <br /> D sandstone at base; locally absent 150-300 <br /> O <br />(> w <br /> <br />U <br /> <br />O <br />VERMEJ SANDSTONE-Fine to medium grained with mudstone, <br /> carbonaceous shale, and extensive, thick coal beds. 0-380 <br />N w FOORMATI RMATION Local sills <br />' <br />O - <br /> <br />U) U SANDSTONE--Fine to medium grained; contains casts of 0-260 <br />w TRINIDAD SANDSTONE O hiomor ha <br /> w <br /> a- PIERRE SHALE SHALE--Silty in upper 300 ft. Grades up to fine grained 1 <br />300-2 <br />300 <br /> sandstone. Contains limestone concretions , <br />, <br />Adapted from Flares and Bader (1999), Tyler and others (1991), and Tremain (1980). <br />Figure 3.6 Detailed Stratigraphic Chart of the Upper Cretaceous and Younger Units in the Raton Basin