Middle Ordovician (Whiterockian) trilobite Bathyurus angelini Billings 1859 from the Carillon Formation (uppermost Beekmantown Group) at Kahnawake, Quebec, and correlative trilobites from eastern Canada

摘要

Shaly carbonate beds at the top of the Beekmantown Group in the Montreal area contain a shallow-water, nearshore fauna of the trilobite Bathyurus angelini Billings, the ostracod Isochilina sp., and poorly preserved conodonts of probable Whiterockian age. The assemblage is compared with faunas in peritidal carbonates of the upper Aguathuna and lower Table Point formations of western Newfoundland containing the trilobite Bathyurus perplexus Billings, ostracods, brachiopods, and a well-developed conodont fauna of early Whiterockian (late Arenig to early Llanvirn) age. Additionally, key Whiterockian brachiopods from the Romaine Formation of the Mingan Islands are here illustrated for the first time. [References: 46]