Eagle Sandstone
| Eagle Sandstone | |
|---|---|
Niobrara Shale | |
| Thickness | 100 to 350 feet |
| Lithology | |
| Primary | Sandstone |
| Other | Sandy shale |
| Location | |
| Region | Montana |
The Eagle Sandstone, originally the
crossbedding and local shale members. It contains large (up to 15 feet in diameter) sandy calcareous concretions. Its thickness varies from 100 to 350 feet due to the lens nature of the individual sandstone layers and local interbedded sandy shale layers.[1]
Dinosaur fossils have been recovered from the formation.[2]
Weathering and erosion of the formation has created natural arches, hoodoos and other picturesque features of the Upper Missouri River Breaks National Monument.[3]
Vertebrate paleofauna
- "Ornithomimus" grandis - Pes.[4]
See also
- List of dinosaur-bearing rock formations
- List of fossiliferous stratigraphic units in Montana
- Paleontology in Montana
References
- ^ Lopez, David A., 2000, Geologic Map of the Billings 30' x 60' Quadrangle, Montana, Geologic Map Series No. 59, Montana Bureau of Mines and Geology [1]
- ISBN 0-520-24209-2.
- ^ Geology of the Upper Missouri River Breaks National Monument, U.S. Department of the Interior, Bureau of Land Management
- ^ "Table 5.1," in Weishampel, et al. (2004). Page 113.
Bibliography
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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