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8 Class III Inventoiy, Colowyo's Collom Mine Project <br />portion of Axial Basin that lies within and near the project area consists of Mancos Shale composed <br />of shale that lies above Frontier sandstone (Tweto 1979). <br />Surface soils vary across the project area landscape depending on the topographic location. Soils <br />on the uplands, slopes, benches, and ridges are generally residual and colluvial with areas of regolith, <br />and they vary from brown sandy, to sandy clay, to clay loam with moderate to profuse sandstone <br />cobbles and gravels. Scattered sandstone outcrops are prominent along some of the ridges and <br />benches. Soils on the lower slopes of the gulches and along the stream bottoms are primarily brown <br />to tan alluvial silts and sandy clay loam deposits with few pebbles and gravels. Some stream bottom <br />areas have colluvial sandstone cobbles, gravels, and angular rocks, and others have fine - grained <br />alluvial silts mixed with residual cherts and sandstone cobbles and gravels. Soil depth is generally <br />shallow on the residual ridge tops and ranges from moderate to deep, especially along the broader <br />stream bottoms. <br />The Yampa River is the major drainage in the region, along with major tributaries that include the <br />Little Snake River and the Elk River. Several minor tributaries originate in the Danforth Hills that <br />flow northward through the project area and across Axial Basin into the Yampa River. Perennial <br />tributaries within the project area include Wilson Creek, Collom Creek, and Morgan Creek. <br />Ephemeral tributaries within the project area include the East and West Fork of Jubb Creek, Little <br />Collom Gulch, Red Littleton Canyon, Hurst Gulch, and the East Fork of Morgan Gulch. All of these <br />streams, including the Yampa River, drain into the Colorado River southwest of the project area. <br />Climatically, the project encompasses mountainous areas with a highland climatic regime, and <br />lower -lying areas are typified by a continental steppe climate. Annual precipitation generally <br />exceeds 30 inches (76 cm) in mountainous areas, with lower -lying areas averaging between 20 and <br />30 inches (50 and 76 cm). The majority of the Colowyo project area is typified as a mountainous <br />region. <br />47599 TRC Mariah Associates Inc. <br />