Eagle Sandstone

Eagle Sandstone
Stratigraphic range: Late Cretaceous
Eagle Sandstone above Billings, MT
TypeGeological formation
UnderliesClaggett Shale, Judith River Formation
OverliesTelegraph Creek Formation, Niobrara Shale
Thickness100 to 350 feet
Lithology
PrimarySandstone
OtherSandy shale
Location
RegionMontana

The Eagle Sandstone, originally the Eagle Formation, 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 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

References

  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.

Bibliography


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