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henryrb
Hello,

I found these at Charmouth, Dorset a few years ago. We believe they may be bone due to their hollow structure, the rock we found these in I believe to be from the Mesozoic era probably about 100million years old. The smaller piece has strange patterns on its surface and the side is smooth. Please identify if it is a rock, mineral or fossil?

Henry,

Thanks :-) 20181124_161551.jpg  20181124_161551.jpg  20181124_161641.jpg  20181124_161702.jpg  20181124_161714.jpg  [smile] 20181124_161551.jpg  20181124_161641.jpg  20181124_161702.jpg  20181124_161714.jpg  20181124_161551.jpg  20181124_161641.jpg  20181124_161702.jpg  20181124_161714.jpg Click image for larger version - Name: 20181124_161641.jpg, Views: 13, Size: 1.69 MB Click image for larger version - Name: 20181124_161702.jpg, Views: 13, Size: 2.06 MB Click image for larger version - Name: 20181124_161714.jpg, Views: 12, Size: 1.70 MB
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prep01
Hi and welcome to the forum (if I haven't already said it)! This is probably Chert, a kind of flint from the early Crretaceous period 100 - 125 myo.It may be flint from later on  -  70 - 85 myo. and has (on the outside) at least one trace fossil, probably part of a large bivalve called Inoceramus and the hollow part is where a sponge would have been - in fact the grainy parts look like a deteriorated sponge of some sort.
Colin Huller
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henryrb
Thank you so much, do you think the sponge could be a Thamnospongia sp? I just thought it looked like one and it comes from the early Cretaceous (100 million years ago) too. Thanks [smile]  
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prep01
Henry - not really in a good enough condition to tell! Also if it is flint rather than Chert, then it would be from the chalk rather than the Greensand.
Colin Huller
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henryrb
Thanks [smile]
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