The presence of a paleoplankton of acritarchs, chitinozoans, spores, scolecodonts and radiolarians from the Siluro - Devonian Formations of the Plourach Region, (Cotes-du-Nord).
Foreign title:
Presence d'un Paleoplancton a Acritarches, Chitinozoaires,Spores,Scolecodontes et Radiolaires dans les Formations Silurodevoniennes de la R Egion de Plourach(Cotes-Du-Nord).