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6 <br />has a total thickness of 1200 to 1600 feet. The base of the Raton consists <br />of a buff to gray pebble conglomerate a few tnches to a few tens of feet ~ <br />~! thick. Bedding within the basal conglomerate is not prominent, but cross <br />lamination may be locally well developed. Most of the Raton consists of <br />very fine to medium grained sandstones including arkose ,ortha~uartzite <br />and oraywake interbedded with gray_ to_dark gray siltstone and shale. Goal <br />ll mined by CFaI is located near the middle of the Raton. The upper~100 to <br />200 feet of the formation tends to be coarser grained, somewhat more arkosic <br />1 and with liohter colored shales. The primary source area for the Raton <br />] is the igneous-metamorphic terrain to the west. <br />I, The Raton formation to the study area may be characterized as stream <br />deposits including channel-point bar fad es. floodplaln deposits and swamp <br />1~ deposits. Excellent exaiaples of channel sands are exposed in the walls of <br />the Picketwire Valley. Local intraformatianal unconformatie.~,,Lnd ah .n <br />~, fades chi an_ g~ esult in a great deal of lateral heterogeniety. <br />The Paleocene, Poison Canyon formation unconformably overlies the <br />ll` Raton and has a thickness of approximately 600 feet in the region. !t _. <br />occurs as small patches, probably no thicker than 200 feet near the study <br />~I area. The fo rnwtion consists of massive, very coarse arkosic sandstone, <br />j pebble conglomerate, and thick shale. These conglomerates and coarse sand- <br />stones are buff to gray in color and weather to a reddish brown and contain <br />~ granite, gneiss and quartzite lithic clasts. The shale is locally silty <br />and carbonaceous. <br />Sills and dikes associated with Tertiary volcanism intrude the Yermejo <br />a <br />i <br />i <br />~~ <br />~~ ~ <br />