Need a better image although it has a 'Speeton' look about it.
Were did you find it?
To take a guess I would say a sideritic nodule containing Cretaceous fossils if you found it south of Speeton but if it is a large nodule then it could be Lower Jurassic - Middle lias.
sorry replied to myself .have put some better pic on
have put some better pics on hope this helps