you are of course correct....call it old age.DOH!!!!..what was there in such profusion on the slate beds apart from pyritised ammonites were Belemnites...hundreds of them. I have only one Trilobite and that's from Morocco.
Best place for trilobites I've seen for last 12 months is Saltwick Bay in slate beds heading towards Whitby along the foreshore. Trilobites everywhere you looked along with small pyritised ammonites.
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