Normapolles. Comparison between central and southwestern Europe during the Cenomanian and Turonian: evolution of biodiversity and paleoenvironment

Through a study of some selected sites, the group of pollen, Normapolles, extinct Angiosperms, appears to be an example illustrating the biodiversity in space, both in France and Czech Republic, as well as in time, from Cenomanian to Turonian. This first study shows an evolution, from a low biodiversity during the Middle Cenomanian, to an explosion of the number of forms in the late Turonian-early Coniacian. This biodiversity evolution seems to he linked to palaeoenvironniental chances, Such as anoxic crisis, climate and/or eustacy...