Laserfiche WebLink
_ n • <br />• <br />and chart. Yellowish-orange sandy ironstone concretions." <br />The lower part of the Laramie Formation is described as <br />"almost entirely yellowish-gray ironstained and white 'salt and <br />_ pepper' friable sandstone composed of quartz, biotite mice and <br />kaolinized feldspar. Sandstone 110 feet thick at base is <br />considered Fox Hills Sandstone by one authority. Gray sandstone <br />contains gray shale chips. Contains thin ironstone layers and <br />shale layers near base. Sub-bituminous coal beds as thick as 8 <br />feet lie in the lower 200 feet above basal sandstone. Abandoned <br />coal mines are areas of potential subsidence, as in the valley '* <br />south of Alameda Parkway. Gray or white claystone in beds more <br />than 10 feet thick is used for manufacture of brick and tile. <br />Contains fossil leaves, wood and other plant remains." <br />The Laramie Formation varies in thickness and consists of <br />several coal and clay or claystone layers occurring between the <br />sandstone layers. Small amounts of these sandstone layers can be <br />mined with the clay, so the smaller strata of sand will sometimes be <br />blended into the clay. The larger strata of sand are generally used <br />as spoil. <br />The Fox Hills Sandstone (Upper Cretaceous Age) lies below the <br />Laramie Formation and presently furnishes the majority of the sand <br />needs for the operator's brick plants. The Arapahoe Formation <br />(also Upper Cretaceous Age) occurs above the Laramie Formation. <br />No clays, shales or cleystones from this latter formation are <br />being used by the operator. <br />Clays that burn buff and red are mined from the Laramie <br />Formation. Generally, the buffs are obtained from the Lower <br />8 <br />