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October 2000 -25- 003-2191 <br />iron-stained moderate-brown sandstone beds and olive-brown siltstone and claystone <br />beds overlie this lower ledge-forming bed. <br />Exposure of the middle and upper part of the Dawson include light-gray blocky <br />siltstone, and yellowish-gray lenticulaz sandstone beds that contain yellow and orange <br />iron stains and cazbonized wood. Bedding is undulatory and discontinuous. <br />Andesitic tuffaceous sandstone of the Denver formation of Late Cretaceous and <br />Paleocene age lies east of the South Platte River to the north. Most of the outcrops of <br />andesitic sandstone in the Littleton quadrangle aze smooth baze exposures on steep <br />slopes of the higher hills south of Littleton or aze vertical cliffs along the more active <br />streams. The andesitic sandstone is clayey, olive brown, or olive gray, and contains <br />sandy ironstone layers, and locally zeolites as cementing material or as the lining of <br />small vugs. The andesitic beds can be traced northwazd into the Denver formations <br />but southwazd they probably dwindle to a thin tongue in the Dawson azkose. The <br />southernmost outcrops in the Littleton Quadrangle to the north that contain andesite <br />aze at stream level in Dad Clazk Gulch; the neat known outcrops to the south aze at <br />Castle Rock and Colorado Springs. <br />Surficial Deposits and Geomorphic Events <br />Unconsolidated deposits cover bedrock in the azea. Alluvium deposited by streams <br />on the pediments and in the terraces is the most widespread deposit and range in age <br />from earliest Pleitstocene to Recent. Loess and eolian sand aze most abundant east of <br />the South Platte River; the loess is of eazly Wisconsin age, the eolian sand of eazly <br />Recent age. From oldest to youngest these deposits aze the Rocky Flats alluvium, <br />Verdos alluvium, Slocum alluvium, pre-Piney Creek alluvium, eolian sand, Piney <br />Creek alluvium, and post-Piney Creek alluvium. <br />• <br />WN2191/3191SMJiW>,niil000dac Sedalia Recycling Center and Depositary <br />