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Seathomas99
See pictures. 
Fossil Nodule Egg - Close Up.jpg 

Encrusted in 10mm a pretty beige centre which has surface indentations about 3-5mm circumference, and is very smooth.

Any suggestions on it having organic origins would be much appreciated … it certainly looks egg like! Fossil Nodule Egg -1.jpg 
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Barrow Museum
I have written more or less the same answer I gave to another correspondent who presented a very similar specimen 8 days ago...

This looks like part of an ironstone nodule, which has formed around a core of claystone. The claystone will have been a hardened mud pellet that had been ripped up by water currents, rolled around and then incorporated as a pebble within a sandy or silty sediment. We cannot say from your information whether it was a marine or freshwater deposit and these structures occur in both. They form after burial when iron in groundwater is attracted to the clay and forms a crust around it, cementing the surrounding matrix. When eroded from its original layer, the nodule has cracked open and the relatively soft clay interior worn away. Sometimes these clay pellets shrink and rattle around inside the ironstone nodules. You may find them described as "box stones".
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