Loose sandy gravel or gravelly sand is below depth of 40 inches. Most pedons are noncalcareous and mildly or moderately alkaline above the underlying sand and gravel. These are the Blackwell , Foxcreek , Dilman , and Ontko series. Blackwell soils are medium or slightly acid and have stratified sandy material between depths of 20 and 40 inches. Ontko soils have ashy or cindery layers in the control section.
Furniss soils are on level or concave bottomlands.
Elevations range from 5,500 to 7,000 feet. The soils formed in mixed alluvium from granite, quartzite, limestone, gneiss, sandstone, and rhyolite. The soils are in a cool, subhumid continental climate with annual precipitation ranging from 16 to 20 inches. The frost-free season is about 40 to 75 days. These are the competing Foxcreek soils and the Tonks , Zohner , and Zundell soils.