Hull Geological Society
Belemnites of the Speeton Clay
The belemnites can be used as zone fossils to subdivide the Speeton Clay beds
Acroteuthis from the Speeton Clay Formation D Beds
Hibolithes from the Speeton Clay Formation C Beds
Oxyteuthis from the Speeton Clay Formation B Beds
Neohibolites from the Red Chalk Formation
Link to notes on the geology of East Yorkshire
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