| Collected from: |
Haldon Hill, Devon, UK |
| Period: |
Cretaceous |
| Date: |
August 2003 |
| Description: |
Cliona is a boring sponge, hollowing out chambers connected by thin galleries in the shell of another organism, usually a bivalve. The cavities get filled by flint and the shell dissolves leaving this characteristic pattern. (Many thanks to Colin Scrutton, OU study advisor for this description.) |
Index of other featured fossil and mineral samples