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all cleared locations were surveyed. Nothing of cultural value <br />• was located and the area has been cleared. A 106 Determination <br />of no Effect statement has been submitted. <br />J. Geology <br />The application site is in the Williams Fork Planning Unit and <br />i <br />' contains sedimentary layers of great depths, which in time have <br />,been sub]ected to structural deformation. <br />The Mesaverde group of Upper Cretaceous Age composes the main <br />rock exposures in the area, and is divided into two formations: <br />Williams Fork Formation above and Iles Formation below. They <br />consist of thick beds of light brown sandstone, some thick key <br />beds of white sandstone interbedded with gray shale, sandy <br />shale, and coal beds. The shale and clay form valleys and <br />slopes covered with debris and waste. The coal seams are <br />J <br />generally hidden by debris. <br />The Williams Fork Formation has three main units. The upper <br />unit is about 200 feet thick in the area of consideration and <br />consists of sandstone beds, sandy shale, dary gray shale, and <br />one coal bed about 3 feet thick. Underlying this unit is the <br />Twentymile Sandstone unit, which is a key bed for mapping since <br />it is a massive, white, ledge-forming sandstone 100-200 feet <br />thick. It usually forms a prominent white ledge at the top of <br />a steep slope rising above the broad lowland. <br />The lower unit of the Williams Fork Formation is important <br />• because it contains several thick coal beds of the middle coal <br />11 <br />