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.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
Dinosaur fossils have been recovered from the formation.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. .
Weathering and erosion of the formation has created natural arches, hoodoos and other picturesque features of the Upper Missouri River Breaks National Monument.
Vertebrate paleofauna "Ornithomimus" grandis - Pes."Table 5.1," in Weishampel, et al. (2004). Page 113.
See also
List of dinosaur-bearing rock formations List of fossiliferous stratigraphic units in Montana Paleontology in Montana
References
Bibliography