Eagle Sandstone
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Eagle Sandstone
Eagle Sandstone
Stratigraphic range: Late Cretaceous
Type Geological formation
Underlies Claggett Shale, Judith River Formation
Overlies Telegraph Creek Formation, Niobrara Shale
Thickness 100 to 350 feet
Primary Sandstone
Other Sandy shale
Region Montana

The Eagle Sandstone is a geological formation in Montana whose strata date back to the Late Cretaceous. It is a light to brownish gray to pale yellow-orange, fine-grained sandstone. It contains areas of 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 lense 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


  1. ^ 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]
  2. ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. ISBN 0-520-24209-2.
  3. ^ Geology of the Upper Missouri River Breaks National Monument, U.S. Department of the Interior, Bureau of Land Management
  4. ^ "Table 5.1," in Weishampel, et al. (2004). Page 113.

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.



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