Stratigraphy, Terminology, and Correlation of Upper Proterozoic Rocks in Omineca and Cassiar Mountains, North-central British Columbia

Résumé du livre

It is proposed that all strata underlying the Atan Group in Cassiar and Omineca mountains of north-central British Columbia be included in the Ingenika Group (restricted) of the Windermere Supergroup. The Ingenika Group is subdivided into four formations which are, from the base upwards: Swannell, Tsaydiz, Espee and Stelkuz. These can be correlated using lithostratigraphic criteria, with homotaxial strata in Cariboo Mountains, comprising the Kaza, Isaac, Cunningham and Yankee Belle formations. In general, the Ingenika Group represents a change in depositional environment similar to that evident elsewhere along the length of the Canadian Cordillera, from deep water clastic sedimentation in the and thickest part, to shallow water clastic and carbonate sedimentation in the upper part. The data seem to be compatible with a concept of a sedimentary wedge constructed along the cratonal margin during the late Proterozoic time.