An aquatic microfossil assemblage from Cenomanian amber of France

The ‘osseous’ amber from the Cenomanian of northwestern France contains numerous microscopic inclusions, some of which are fairly well preserved and identifiable as protists. This paper describes three cyanobacteria similar to modern Plectonema. Lyngbya, and Coelosphaeriunr, fungus-like fossils of uncertain affinities (cf. ?Candida); a colorless chrysomonad similar to Monas; a desmid identical with Closterium; and naked ciliates of uncertain affinities (cf. Cyrtolophosis). All of these fossils are in a single sample of amber from Bretagnolles (Eure Département). This assemblage is comparable to modern limnetic microbial communities. It is typical of shallow freshwater environments in which productivity and respiration are both high. This interpretation fits paleoecological reconstructions drawn from the arthropod fossils from French amber. ***Chrysomonads, ciliates, Cretaceous, cyanobacteria, desmids, fungi, micropaleontology.