Statewide Rule 13-Geologic Formation Information The weblinks below connect to geologic formation information provided as a guideline for assistance with compliance of casing cement depth during well completions. This data is categorized first by Commission District, then on a spreadsheet with tabs for each county within that District. The above list may not be all inclusive, and may also include formations that do not intersect all wellbores. Formation “TOP” information listed reflects an estimated range based on geologic variances across the county. To clarify, the “Deep Top” listed is not the bottom of the formation; it is the deepest depth at which the “TOP” of the formation has been or might be encountered. Please review the “General Information” tab (the first tab of each District’s sheet) for additional information.
All Statewide Rule 13 Formations are listed in Excel Format