Stratigraphic range: Late Cretaceous
|Underlies||Claggett Shale, Judith River Formation|
|Overlies||Telegraph Creek Formation, Niobrara Shale|
|Thickness||100 to 350 feet|
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.
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