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Summary
| Description |
English: Septarian nodule in Bristol City Museum, Bristol, England. This is a local concentration of calcite, forming a hard lump in mudstone. Radiating shrinkage cracks have filled with veins of calcite.
From the Middle Jurassic, Callovian Stage, Oxford clay, in Wiltshire, England. |
| Date | |
| Source | Own work |
| Author | Adrian Pingstone (Arpingstone) |
Licensing
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This work has been released into the public domain by its author, Arpingstone. This applies worldwide. In some countries this may not be legally possible; if so: |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:52, 26 January 2008 | | 1,703 × 1,447 (2.71 MB) | Arpingstone | Septarian nodule |
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