| State | Iowa |
|---|---|
| Name | Niobrara Formation |
| Geologic age | Upper Cretaceous; ?Santonian, lower Campanian |
| Lithologic constituents | Major
Sedimentary > Clastic > Mudstone > Shale (Bed, Calcareous)silty, calcareous to marly
|
| References | Witzke, Brian J., Anderson, Raymond R., and Pope, John P., 2010, Iowa Geological and Water Survey, DNR, Bedrock Geologic Map of Iowa, OFM-2010-1. Scale 1:500,000. |
| NGMDB product | |
| Counties | Lyon |