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• The Laramie formation overlying the Fox Hills Sandstone consists of yellow- <br />brown and gray to blue-gray soft carbonaceous shale and clay-shale <br />interbedded with sand and shaley sand. It contains cross-bedded gray to buff <br />sandstone, which is slightly to well-cemented, and contains coal seams in the <br />lower portion. <br />The Laramie forms the bedrock across all of the mine site and is covered by <br />unconsolidated Tertiary and Quaternary deposits consisting of dune sand, <br />alluvium and terrace deposits dipping slightly westward. Refer to Regional <br />Bedrock Geology Map, following this section. All beds below the Tertiary and <br />Quarternary deposits dip slightly to the west. <br />The formations which are most abundant at or hear the surface in Weld County <br />are the Fox Hills and Laramie formations. Refer to the Generalized <br />Stratigraphic drawing following this section. The Ogallala and Arikee <br />formations are found in the northeast portion of the county. The alluvial <br />materials were deposited in the flood plain of the South Platte River Valley. <br />Terrace deposits formed mainly in the central portion of the county on both <br />sides of the river valley. <br />• <br />• <br />43 <br />