In the monographs he publishes about the Portuguese sedimentary formations he creates the Lusitanian, describes the Bathonian and Senonian floors and separates the Trias from the Infralias.  In this context it is to relieve the creation of floor Lusitaniano for stratigraphic set Oxfordian upper and Kimmeridgian temporarily accepted and often still referred to. He also defined the floor he designated by Belasiano (meanwhile fallen into disuse), represented in the Belas region, outside Lisbon, consisting of marl andlimestones with a silicyblastic series at the base, corresponding to part of the Cenomanian.De rerum natura: Léon Paul Choffat (1849-1919) por A.M. Galopim de Carvalho.
