Compiled by Rocky Mountain Region. There are nearly level to gently rolling till plains with potholes and well defined dendritic drainage system. Moderate to steep slopes are adjacent to major valleys. River and creek valleys have smooth floors and steeps walls. Higher parts of tablelands are moderately sloping, but steeper areas occur on ridges and drainage ways.
Drainages are well defined except in some undulating areas where eolian materials cover the bedrock.
This Section is within Fenneman and Johnson's Great Plains geomorphic physical division. Lithology and Stratigraphy. Most of the Section is Cretaceous marine shale, with local Tertiary sandstones and claystones in the extreme south. Mesic temperature and ustic moisture regimes occur. Soils include Mollisols, including Agriborolls and Haplustolls.