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<br />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 inches 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. ~titost of the Raton consists of <br />very fine to medium grained sandstones including arkose, orthoquartzite <br />and araywake interbedded with gray to dark gray silts tone and shale. Coal <br />t mined by CFBI is located near the middle of the Raton. The upper 100 to <br />1 200 feet of the formation tends to be coarser grained, somewhat more arkosic <br />1 and with lighter colored shales. The primary source area for the Raton <br />is the igneous-metamorphic terrain to the west. <br />The Raton formation in the study area may be characterized as stream <br />I <br />deposits including channel-point bar facies, fioodplain deposits and swamp <br />i deposits. Excellent examples of channel sands are exposed in the walls of <br />' the Picketwire Valley. Local intraformational unconformaties and abrupt <br />facies changes result in a great deal of lateral heterogeniety. <br />• <br />The Paleocene, Poison Canyon formation unconformably overlies the <br />f Raton and has a thickness of approximately 600 feet in the region. It <br />l <br />occurs as small patches, probably no thicker than 200 feet near the study <br />area. The formation consists of massive, very coarse arkosic sandstone, <br />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 />I <br />Sills and dikes associated with Tertiary volcanism intrude the Vermejo <br /> <br />1 <br />L <br />