Abstracts
Abstract
The Ordovician Cookson Group in southwestern New Brunswick is divided into formations previously recognized in the adjacent area of Maine. However, the stratigraphic order of these formations is revised based on new fossil evidence. From the base upward, the revised Cookson Group comprises the Calais, Woodland, Pocomoonshine Lake, and Kendall Mountain formations; the latter formation contains newly discovered Caradocian graptolites.
The Digdeguash Formation, previously assigned to the Silurian, is now included in the Cookson Group, and is considered to be equivalent to the Woodland and Pocomoonshine Lake formations on the basis of lithological similarities. The contact between the Digdeguash Formation and the Silurian Flume Ridge Formation, previously interpreted to be gradational, is a major fault
RESUME
Le Groupe de Cookson du sud-ouest du Nouveau-Brunswick est divise' en formations a deja que Ton identifiers dans la region adjacente du Maine. Cependant l'ordre stratigraphique de ces formations a 616 r&visi. suite a la decouverte d'un nouveau site fossilifere. A partir du bas, le Groupe de Cookson revise' comprend les formations de Calais, Woodland, Pocomoonshine Lake et de Kendall Mountain; cette demiere contient des graptolites nouvellement decouverts appartenant a l'Ordovicien moyen (Caradocien).
La Formation de Digdeguash, anterieurement considdree comme faisant partie du Silurien, est maintenant int^gree au Groupe de Cookson. La Formation de Digdeguash represente un fades similaire a celui des formations Woodland et Pocomoonshine Lake. La zone de contact entre la Formation de Digdeguash et la Formation de Flume Ridge, d'age silurien, anterieurement considered comme graduelle est, en effet, une fait importante.
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