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<br />' soil conditions, and Map Exhibit J-1 depicts current vegetation on <br />' the affected land. <br />Mining has been in progress for more than 44 years. As a <br />' result, about one-third of the affected land has been disturbed. <br />' Several soil/overburden stockpiles are available for reclaiming <br />areas where clay has been extracted. These current soil/over- <br />' burden stockpiles are shown on Map Exhibit C. <br />No buildings or other structures are located on the affected <br />' land or within 200 feet of the boundaries thereof. A motorcycle <br />' trail facility operated by the City of Lakewood is located in the <br />northeast sector of the property. Approximately 50 percent of the <br />' topsoil once on the surface of the motorcycle facility has been <br />lost or is irretrievable. It is expected that the facility will <br />' be removed in 1984. <br />' Geologic Settin¢. The affected land is located on the <br />far west side of the Denver-Julesburg Basin, approximately two <br />' .miles north/northeast of the Town of Morrison. The sedimentary <br />beds of Cretaceous Age dip steeply to the east (70 to 80 degrees). <br />' Clay and silica are produced from the Laramie Formation and Fox <br />Hills Sandstone, both of Upper Cretaceous Age. <br />Generally, the Laramie Formation is divided into two parts. <br />' The Upper Laramie is described in USGS Map I-790-A as being "light <br />gray micaceous siltstone stained yellowish orange, light, <br />' olive, and pinkish-gray silty claystone, grayish-brown lignitic <br />claystone, minor white and yellowish-orange friable ridgeforming <br />sandstone, and near the top are thin layers of conglomerate <br />' composed of pebbles of sedimentary rocks. Sand grains are quartz <br />i~ , <br />