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Found on various beaches over time, rocks that had been burrowed into by wormy sea-creaturey things and have resulted in some interesting small-scale natural sculptures......
(Many years ago I had a great collection of fossils found, legally, on the Jurassic coast in the 70s, but during a big clear out when moving, I gave them away, and have regretted it ever since. This example I found about 10 years ago, but is not as good a specimen as the ones I used to have. )