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Manich54
Hi
New CD35682E-230F-4325-91AF-B8F9278CF231.jpeg  CEC9D361-FA4D-460F-A1B3-ACFF77F900EC.jpeg  member here, can anyone tell me what this is, found on the banks of the river wharf 
thanks 
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Barrow Museum
You have found a septarian nodule:
These formed when a patch of lime concentrated around something in a mudstone sediment (often a shell) a short distance below the seafloor, during the time of deposition of the sediment. These concretions shrank internally as they hardened and small cracks formed in their interior. These filled with mineral, which in your case looks like calcite (lime). You have a fragment of one of these concretions which has been broken by being battered around in the river bed. Because of the way they formed, it is not unusual for a decent, uncompressed fossil to be found inside them. though it may have a "crazy paving" appearance due to the changes that occurred in the concretion as it became more indurated.
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Manich54
Interesting, thanks for the reply 
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prep01
Hello and welcome to the forum. Yes, this is a nice Septarian nodule.
Colin Huller
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Manich54
Thanks, how old is it roughly ? 
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Dirty Pete
The bedrock the Wharfe cuts through as far as I can see is Carboniferous (Namurian) to Permian. So that gives you a span of 350-250 million years. However the area has been glaciated so it could be an erratic dumped from elsewhere in which case think of a number.....any number.

Pete
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Manich54
Thanks 
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