Les microorganismes de l’ambre cénomanien d’Écommoy (Sarthe, France)

The Cenomanian amber of Écommoy (Sarthe, France) is studied for the first time under the scope of the microscopical organic inclusions. A felting of Cyanobacteria Palaeocolteronema cenomanensis gen. nov., sp. nov., which is to be also found in ambers from marsh or estuarine deposits of the Late Albian of Charente-Maritime, is the most conspicuous character of this amber. The taphocoenosis also comprises oval inclusions of various sizes, euglenians, diatoms, naked amoebas, bacteria, algae cf. Siphonales?, one filament cf. Trentepohlia sp., and several incertae sedis . The Cenomanian amber from Écommoy is a litter amber, formed in a terrestrial to freshwater (occasionally briny) environment, in a marsh behind the coast.