Cretaceous Interior Seaway

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The Western Interior Seaway during the Cretaceous Period, with Montana and the Choteau-Augusta area highlighted.
Originally uploaded in Integrating Research and Education:Montana Geoheritage Project:Montana-Yellowstone Geologic Field Guide Database.

Image 179433 is a 1199 by 975 pixel WebP
Uploaded: Mar5 18

Last Modified: 2018-03-05 15:21:05
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Modified from Sampson et al., 2010.
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