Cleviceras sp. (Howarth 1992)
The concretion measures 11cm. Lower Toarcian, Whitby Mudstone Formation, Thoarsense Zone. Kettleness, Yorkshire, England.
By Ludwigia
The concretion measures 11cm. Lower Toarcian, Whitby Mudstone Formation, Thoarsense Zone. Kettleness, Yorkshire, England.
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