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Matthew Runswick
My father in law found this on the beach at Runswick Bay near Whitby. Just wondering what you think it is. Thanks.  Matthew Click image for larger version - Name: FCAB3268-5922-4ECA-B7CC-942417636368.jpeg, Views: 108, Size: 430.65 KB Click image for larger version - Name: 9681DF3F-F0EE-4E93-B34D-5C159078BAAB.jpeg, Views: 110, Size: 256.58 KB Click image for larger version - Name: A1061D37-357C-4764-ADD4-4E4C1BA1916D.jpeg, Views: 95, Size: 307.07 KB Click image for larger version - Name: 1D49EE34-C092-44B0-AA3F-1C13AE322EE9.jpeg, Views: 90, Size: 276.68 KB
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fossiladdict
looks intriguing that I'm in south wales so no idea about runswick bay! waiting with baited breath here......it looks like bone to me perhaps by me responding it will come to someones attention!!!
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prep01
I really can't make it out!
Colin Huller
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fossiladdict
at a glance it looks exciting.....you would think bone?  zooming in not so sure its had a few views ...you would think it would have comments as Long as your arm if it is something to behold! still begs a simple question and answer! what is it?
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Matthew Runswick
Thanks for the replies! The funny thing is, it’s been in my father-in-law’s drawer for years in Japan. He said if it’s a fossil it belongs back in the UK so we’re bringing it back next week. I’ll post some more pics then.
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fossiladdict
that explains the japanese bottle top... yes i had to google that!!
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Gerald Gibson
Matthew:

If I didn't know better I would say, judging by its structure, that it's a skull--possibly a bird since I see no teeth.  However, resemblances are deceiving.  Some bivalves, when they break in an irregular way, appear as bones.  There are other invertebrates that might appear to be skulls or other fossil bones, and yet from a front-on view it does look like a skull, its edges broken away around the eye socket but with an adequately defined beak or mouth.  What is the geological age of the area?
Was it a marine or terrestrial formation?

---- Gerald
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prep01
Hi Matthew, as none on here seems to be able to help you, may I suggest taking it here - https://www.nhm.ac.uk/take-part/centre-for-uk-biodiversity.html
Colin Huller
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Rhaetianpenarth207
It’s fossilised jet encrusted with pyrite which is fossilised monkey puzzle tree wood and is often found at Whitby and used in jewellery.
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Rhaetianpenarth207
On a second glance it might not be pyrite around it but some kind of nodule but I’m still sure it’s jet. It also resembles lignite which is another type of fossilised wood known from the Isle of Wight.
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Matthew Runswick
Thanks for all the feedback. I will definitely take it into the natural history museum drop in service. I’m a bit of a jet collector so I know for sure it isn’t jet. I’ll keep you posted. Matthew
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Weald on Bed
Just looks like a worn septarian nodule to me, though I'm not familiar with the locality. Definitely not bone - you can see from the shiny surface where it's in cross section that there's no internal structure.
Iron-rich mudstones often produce shapes that look like something exciting - but they never are! 
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TqB
It's a chunk of iron rich nodule or bed from the local Middle Lias (half of which is Cleveland Ironstone Formation). There might be a piece of wood in the middle - it's fairly frequent there.
Tarquin
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Matthew Runswick
Just been to the Natural History Museum. Turns out you are right... a sectarian nodule. It looks exciting but nothing unfortunately. On the plus side, we had a great day out! Thanks for all the comments and feedback. M
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