Меловой период

Baudouin C., Delanoy G., Moreno-Bedmar J.A., Pictet A., Vermeulen J., Conte G. , Gonnet R., Boselli P. & Boselli M. (2016) Revision of the Early Cretaceous genera Heminautilus Spath, 1927, and Josanautilus Martínez & Grauges, 2006 (Nautilida, Cenoceratidae) // Carnets Geol., Madrid, vol. 16, no. 5, p. 61-212.

http://paleopolis.rediris.es/cg/1605/index.html