Judith River Formation
| Use attributes for filter ! | |
| Underlies | Bearpaw Formation |
|---|---|
| Unit of | Judith River Group |
| Sub-units | Birch Lake Member, Ribstone Creek Member, Brosseau Member, Victoria Member |
| Thickness | max 360 meters (1,180 ft) |
| Primary | Siltstone |
| Sandstone | |
| Overlies | Claggett Shale |
| Pakowki Formation | |
| Date of Reg. | |
| Date of Upd. | |
| ID | 3144946 |
About Judith River Formation
The Judith River Formation is a fossil-bearing geologic formation in Montana, and is part of the Judith River Group. It dates to the Late Cretaceous, between 80 and 75 million years ago, corresponding to the "Judithian" land vertebrate age.
