Reference

Volker Dietze, Charles Mangold, Robert B. Chandler (2002): Two new species of Berbericeras ROMAN, 1933 (Morphoceratidae, Ammonitina) from the Zigzag Bed (Lower Bathonian, Zigzag Zone) of Waddon Hill (Broadwindsor, Dorset, Southern England) – Stuttgarter Beiträge Naturkunde Serie B [Paläontologie] – 324_B: 1 - 11.