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I have a few of these now but can't find them in any of my [basic] books.
This, along with the 2 others I have were found in locally quarried 20mm stone (locally being North Norfolk).
I'm guessing this is Sea-Life whether Animal or Plant because this part of North Norfolk was originally sea bed and estuaries.
If it helps, one of the other examples is pod-like i.e. enclosed which makes me think that the one photographed here is broken at the flat end.
It's maybe not as interesting as my last two threads but I would be grateful for an ID of some sort.
Thanks, Dan Billingham.
These are just flint nodules.
The concentric layering is due to slightly differing chemistry/mineralogy, which causes weathering to pick out one layer from the next (as seen in your specimen).
Flints sometimes form around a fossil or other irregularity acting as nucleus.
In this case, though, the shape suggest the flint is in effect a cast of a burrow in the sediment.
Refs re flint: