What this is
The Nebraska Bedrock Geology layer is a digitized version of the state’s bedrock geology, based on a 1:250,000-scale series of geologic bedrock maps for eastern and southern Nebraska. The primary source is the Conservation and Survey Department (CSD) at the University of Nebraska-Lincoln, which has compiled and maintained these geologic maps as the authoritative reference for the state’s subsurface rock formations.
Why it matters to you
If you’re planning construction, drilling a well, siting a foundation, or evaluating a parcel for agricultural or development use, knowing the underlying bedrock geology affects everything from soil stability and drainage to water well yields and excavation costs. This map tells you what kind of rock sits beneath the surface across Nebraska — information that matters for engineers, farmers, well drillers, and developers before they commit to a site.
How to read this data
Each polygon represents a mapped bedrock unit — a formation, group, or rock type with a specific geologic age and composition. The map is most useful at regional and county scales: it shows broad patterns of sandstone, limestone, shale, and other units across Nebraska. It is not a site-specific engineering survey and doesn’t replace a geotechnical investigation for a single parcel.
Where this leaves you
Bedrock geology is a regional characteristic — it doesn’t change from one address to the next within a mapped unit, but it also can’t be confirmed for a specific lot without a site investigation. This layer gives you the regional picture; for a specific property, consult a geologist or geotechnical engineer and reference the CSD’s more detailed quadrangle maps.
Look it up yourself
Open the map and zoom to your area. The colored polygons show the bedrock formation under your location. For a specific parcel or construction project, contact the UNL Conservation and Survey Department for the detailed quadrangle map covering your area, or hire a geotechnical engineer for a site-specific assessment.