CDWR has published Water Resources Investigation WRI 2017-1a, The Upper Pierre Aquifer of the Cheyenne Basin, Northeastern Colorado, Geologic Cross Sections.
A brief summary of the report is below:
Th Upper Pierre Aquifer of the Cheyenne Basin,
Northeastern Colorado, Geologic Cross Sections
By Ralf Topper, Clinton D. Meyer, Marshall Haworth, Kevin C. Donegan,
Hillary Banks, Aaron Bandler, Andrew Flor, and Matthew A. Sares
First of a two-part hydrogeologic study of the Upper Pierre aquifer within the Cheyenne Basin of northeastern Colorado consisting of a short text report with 11 plates. This report (WRI 2017-1a) is a compilation of ten regional geologic cross sections created from interpretation of geophysical logs from 200 oil and gas wells. The cross sections depict the following geologic/hydrogeologic intervals: South Platte River alluvial aquifer, Ogallala Formation, White River Formation, Laramie Formation, Fox Hills Sandstone, Upper Pierre Shale upper confining layer, Upper Pierre aquifer, Pierre Ash, Upper Pierre Shale lower confining layer.
The text, maps and cross sections can be downloaded from the DWR Homepage in the “New!" section in the middle of the page. http://water.state.co.us