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EmmaP
Hi me and son had two interesting finds on the beach in Christchurch, Dorset and wondered if you could help us identify our finds. The second one is black and shiny inside. Many thanks. Click image for larger version - Name: IMG_20180828_155042.jpg, Views: 31, Size: 725.28 KB Click image for larger version - Name: IMG_20180828_155411.jpg, Views: 29, Size: 223.53 KB Click image for larger version - Name: IMG_20180905_144352.jpg, Views: 29, Size: 332.53 KB
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Richard
Hi 
They are both flints.
The first is banded flint - or furrowed flint if it has grooves. It is not known how these form.
The second is possibly a flint that formed within an animal burrow in the Chalk. In which case it is a 'trace fossil'.
Richard
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EmmaP
Thank you Richard.
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Brittle Star
I agree with Richard, flint. In my experience sponges are seen in flint as hollows with textured walls. Burrows which start out as hollows are infilled. Which is a possibility in this case.
JW

 Never ask a star fish for directions
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