Systematics and evolution of the Lower Cretaceous ammonites and biostratigraphy of the Berriasian, Valanginian and Hauterivian stages worldwide.
*Working on the ammonite biostratigraphy and zonation of the Upper Berriasian and Valanginian of France and Spain.
*Working on the serie Fossilium Catalogus of Lower Cretaceous Ammonites in 10 parts.
Part I. Perisphinctaceae 1: Himalayitidae, Olcostephanidae, Holcodiscidae, Neocomitidae and Oosterellidae (2005).
Part II. Perisphintaceae 2: Polyptychitidae and Pulchelliidae (2006).
Part III. Bochianitoidea, Protancyloceratoidea, Ancyloceratoidea, Ptychoceratoidea (2007).
Part IV. Boreophylloceratoidea, Phylloceratoidea, Lytoceratoidea, Tetragonitoidea and Haploceratoidea (2009).
Part V. Desmoceratoidea (2011).
Part VI. Deshayesitoidea and Douvilleiceratoidea (2013)
Part VII. Hoplitoidea & Engonoceratoidea (expected 2014)
This serie wants to give current and future researchers an overview, as complete as possible, of genera, species and types of Lower Cretaceous ammonites with the corresponding literature. This survey can be important as a tool for the work on the actual problems like the definition of the Jurassic-Cretaceous boundary, the definition of the boundaries between (sub)stages of the Lower Cretaceous and the definition of (sub)zones in the Lower Cretaceous.
This systematic approach is also the intention of the IUGS Lower Cretaceous Ammonite Working Group, the ‘Kilian Group’, part of the IUGS Subcommission on Cretaceous Stratigraphy, a group of specialists from all over the world, which work both individually as collective on these topics.
'The aims of this group are to construct a standard ammonite zonation for the Lower Cretaceous Series, which is in fact the zonation for the Mediterranean Faunal Province, where all Lower Cretaceous stages except the Albian, were defined; to develop ammonite zonations for other key areas in the Tethyan, Boreal and Austral realms and to calibrate them with the 'standard'; and to recommendate on the definitions of Lower Cretaceous stage and substage boundaries to the appropriate stage working groups of the 'IUGS Subcommission on Cretaceous Stratigraphy' (Hoedemaeker et al., 2003).
The last part will conclude with an overview of the stratigraphy of Lower Cretaceous ammonites (specified as refined as possible in stages, zones, subzones or horizons) and with the actual correlation of the ammonite (sub) provinces in the world.
After the completion this serie, CD's will be published with the pictures of the holotypes, lectotypes, neotypes, etc.
Lower Cretaceous of France & Spain (Upper Berriasian, Valanginian and Lower Hauterivian) and Colombia (Hauterivian, Barremian and Aptian).
ca 40.000 Upper Berriasian, Valanginian and Lower Hauterivian ammonites from France and Spain. About half of the collection is now in the collection of Naturalis: the National Natural History Museum of the Netherlands in Leiden.