File:Ogallala opaline sandstone with weathered silcrete 20201115 195900.jpg
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Summary
| 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/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 04:12, 16 November 2020 | | 2,195 × 2,000 (1.19 MB) | IveGoneAway | Uploaded own work with UploadWizard |
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