Succession des assemblages de chitinozoaires dans l’Ordovicien moyen du Québec et de l’est du Canada

Comparison of chitinozoan microfaunas prepared from samples belonging to the Mictaw Group and the Quebec City Formation, is combined with published palynological data and integrated with the stratigraphic information based on graptolites. This justifies the proposal of a chronological succession of chitinozoan microfaunas for the Middle Ordovician.