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Dwhit

 We found these at home on our usual fossil hunt walk at home. 15934306642728234514954234000298.jpg  15934306772746881550717180977679.jpg  . Usually we can find out what things are but not these!!
Anyone know what this is???
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Dirty Pete
Hi
What about small worn and rounded and subsequently broken flint pebbles with depressions that were once occupied by fossil sponge. I think I see pores in one of them.....
15934306642728234514954234000298.jpg 
Pete

PS what's a disk hunt?
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Dwhit
It won't let me edit.... Its meant to be fossil hunt at home but I never finished or edited before posting 🙈🙈

 Could well be that... Just strange to find 3 the same, or not?!
 I will give it a good clean and get another picture! 
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Barrow Museum
They look to me a little like internal casts of body chambers of small nautiloid shells. If the septate, central, part was never filled with sediment, then this is all that would be left.  The critical feature would be a small dimple approximately central on the crescent-shaped convex surface, from where the siphuncle would have extended.  Can you see this?  If it's not there, then it's a real mystery.  But they are identical so obviously a real item and we might be able to tell you more if you can explain where exactly they were found originally (not on the desk!)
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Dwhit
We have a chalk pit on the farm where these came from and also a patch of green sand which has been dug behind a barn where we find things. I will attach some better pictures, cleaned up they are all slightly different...  15934967883871950790532601309149.jpg  15934968276896123071560940414030.jpg 
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Dwhit
We found them in our Chalk pit at home on the farm. We also have a bank of green sand dug out behind a barn we find things. Nothing too exciting but when we start we cant stop looking!
 The three pieces are slightly different I will attach some better photos! Click image for larger version - Name: IMG_20200630_070703.jpg, Views: 16, Size: 176.29 KB Click image for larger version - Name: IMG_20200630_070729.jpg, Views: 17, Size: 185.69 KB Click image for larger version - Name: IMG_20200630_070835.jpg, Views: 15, Size: 119.24 KB Click image for larger version - Name: IMG_20200630_070857.jpg, Views: 16, Size: 173.10 KB Click image for larger version - Name: IMG_20200630_070913.jpg, Views: 16, Size: 161.58 KB Click image for larger version - Name: IMG_20200630_070925.jpg, Views: 15, Size: 164.20 KB Click image for larger version - Name: IMG_20200630_070935.jpg, Views: 15, Size: 141.98 KB
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Dwhit
Thank you for the info so far! I am having trouble uploading - our internet is so so!! We found them in our chalk pit on the farm. We also have a bank of green sand dug from behind a barn we find things! 
 I will attach some more pictures as the three are slightly different Click image for larger version - Name: IMG_20200630_070703.jpg, Views: 14, Size: 176.29 KB Click image for larger version - Name: IMG_20200630_070729.jpg, Views: 15, Size: 185.69 KB Click image for larger version - Name: IMG_20200630_070835.jpg, Views: 16, Size: 119.24 KB
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Dwhit
They were found in our chalk pit at home, its been dug out for tracks and a barn. 
Thank you for your info so far. They all seem slightly different I will try and get some more pictures up!
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Barrow Museum
Now with sharper photos I can see that they are definitely Nautiloid fossils.
There is a trace of some chambers discernible on some photos.  You should be able to find a complete one with a bit more searching.
Here are a couple of similar pieces   from the Chalk, in my collection, for comparison.  They look identical, but Nautilus shells didn't change much through time so putting a name to them is not a simple matter.  But, as it is Chalk I suspect the genus Eutrephoceras.
Chalk Nautiloid.jpg 
 
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estwing
Or even Scaphites? I can see very faint ribs on one of them
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Dwhit
Thank you very much!!!! 
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