Меловой период

Bersac S. & Bert D. (2019) The lower Aptian ammonites of the Les Ferres Aptian Basin (Lower Cretaceous, Southeast of France). Part I: Introduction and biostratigraphy // Carnets Geol., Madrid, vol. 19, no. 5, p. 149-183.

http://paleopolis.rediris.es/cg/1909/index.html