Dactylioceras tenuicostatum (Young&Bird 1822) ?
4cm. Pyritized. I'm not so sure about the ID here. From Ravenscar, Yorks., GB. Lower Toarcian, Whitby Mudstone Formation.
By Ludwigia
4cm. Pyritized. I'm not so sure about the ID here. From Ravenscar, Yorks., GB. Lower Toarcian, Whitby Mudstone Formation.
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