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File:Ogallala opaline sandstone with weathered silcrete 20201115 195900.jpg

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Ogallala opaline sandstone with weathered silcrete.

Summary

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Description
English: This sample of opalized sandstone from the Ogallala Formation demonstrates that silcrete formed on soils overlying the weathering Niobrara Chalk before weathering out itself and then being washed into the sand bank of a Miocene river. The abundant thicker Inoceramus fragments in the sandstone (some to the upper left of the silcrete) evidences proximity to the crumbling Niobrara Chalk outcrop over which much of the Ogallala was deposited in western Kansas.
Date
Source Own work
Author IveGoneAway

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Date/TimeThumbnailDimensionsUserComment
current04:12, 16 November 2020Thumbnail for version as of 04:12, 16 November 20202,195 × 2,000 (1.19 MB)IveGoneAway (talk | contribs)Uploaded own work with UploadWizard

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