Reference

Volker Dietze, Axel v. Hillebrandt, Günter Schweigert, Bernard Joly, Alberto Riccardi (2010): Ammonite faunas and stratigraphy of the Lower Bajocian of Paso del Espinacito (Middle Jurassic, San Juan Province, Argentina) – Palaeodiversity – 3: 89 - 121.