| Title | Paleocene-age Tongue River-Sentinel Butte formational contact near Medora |
| Description | Upper Paleocene-age Tongue River (Bullion Creek)-Sentinel Butte formational contact, Billings County, North Dakota. River channel erosion into underlying Tongue River strata. |
| Chronostratigraphy | Paleogene, Paleocene |
| Lithostratigraphy | Tongue River (Bullion Creek) Formation: Sentinel Butte Formation |
| Geologic province | Williston Basin |
| Location | USA ▹ North Dakota ▹ Billings County. Near Medora. |
| Photographer | Joseph Hartman. 1994. |
| Collection | Joseph Hartman C03746. |
| Key words | Paleocene, Tongue River Formation, Sentinel Butte Formation, North Dakota |
| Tech details | 555 KB. Outcrop. Kodachrome, TIFF format. |
| GeoDIL number | 326 |
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