Hi, I found this on the beach at Trimingham, Norfolk (August 2013) and am keen to know what it belonged to.
Pictures are 1A through 1D, will post other angles or a more detailed macro-shot if this helps.
Thanks, Dan Billingham.
It is a sea urchin (echinoid).
Your photos show ambulacral plates (the hexagons).
It looks like it has been preserved in flint (and it may have served as a nucleus during the formation of the flint).
You asked what your fossil belong to and has been I.D. as part of a sea urchin, well like most of the sea urchins that we find on the Holderness coast they come from the Cretaceous chalk of the Flamborough cliffs.
They were deposited into your and my area during the ice age aprox 14.000 years ago along with Belemnites, Ammonites etc and are given the general name for rocks - minerals - fossils loose on the beach as 'erratics'.
On the Holderness we find Scandinavian rocks, Scottish rocks and rocks from all along the Yorkshire coast.
I once I.D a Speeton (Cretaceous) ammonite that was found on the beach near you.
Below is a couple of images of urchins that are in our collection, the second image are urchins fron the Holderness (one at the back like yours) and the other brown one is one that I found at Whale Chine on the I.W. it has two different sea urchins in the assemblance.
Yes, definitely sea urchins, lovely specimens too. I would love to see these in hand specimen if you are visiting the Natural History Museum, London soon? If not, please can you send them to IAS2@nhm.ac.uk and I will try to get a more detailed identification.
I am holiday at present and do not have access. You might like to try the Echinoid Directory in the meantime.
All the best;