File:Quartzose sandstone (Eagle Sandstone, Upper Cretaceous; loose piece from near cliff base at Pictograph Cave State Park, southern Montana, USA) (15627845825).jpg

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Quartzose sandstone (5.8 cm across at its widest) from the Cretaceous of Montana, USA.

The Eagle Sandstone is a widespread, Late Cretaceous-aged marine unit in Montana. It represents nearshore and shallow marine deposition in the ancient Western Interior Seaway. This sample is an unusual for a quartzose sandstone. The grains are dominated by angular to subangular sand (plus some minor lithic sand). Many quartzose sandstones are dominated by subrounded sand grains.

Stratigraphy: Eagle Sandstone, Upper Cretaceous

Locality: loose piece from near cliff base in Pictograph Cave State Park, southern Montana, USA
Date
Source Quartzose sandstone (Eagle Sandstone, Upper Cretaceous; loose piece from near cliff base at Pictograph Cave State Park, southern Montana, USA)
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15627845825 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

1 December 2019

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Date/TimeThumbnailDimensionsUserComment
current09:07, 1 December 2019Thumbnail for version as of 09:07, 1 December 20192,815 × 1,984 (1.96 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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