Hi Colin ,Pete
thanks for the feedback ,I was hoping to find a trilobite, but you know what it's like ,probably trying to hard ,but there's always another day. Although there was definite use of hammers , lots of hammer spoil piles ,it's a shame as it's a no hammer site ,and recent working on bed rock , it's definitely not natural erosion. For a inner city site it's amazing and thanks to national nature reserve, it not a housing estate.Anyway I will go back
I have the same 'attachment' markings on a Gryphaea bilobata.