| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from South Dakota > Fossilized Sphenodiscus |
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| DESCRIPTION: | No. 55291 |
| Mineral: | Fossilized Sphenodiscus |
| Locality: | Fox Hills Formation, Pennington County, South Dakota |
| Description: | Two circular brown sphenodiscus fossils to 25 mm in gray sedimentary matrix with many partial fossils scattered through the matrix. |
| Overall Size: | 6x6x4.5 cm |
| Crystals: | 11-25 mm fossils |
| Archived: | For reference only |
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