Lithology, Trace Fossils, and Correlation of Precambrian-Cambrian Boundary Beds, Cassiar Mountains, North-Central British Columbia

Description

Trace fossils from the upper part of the Stelkuz formation (609m +) and from the overlying Boya Formation (400.5 m) permit atentative definition of the Precambrian-Cambrian boundary in theCassiar Mountains. The strata investigated are below the top ofthe Lower Cambrian Fallotaspis Zone, a level located 1.5 m abovethe upper contact of the Boya Formation. The Precambrian-Cambrian boundary is tentatively placed 592 m below this level ata disconformity within the Stelkuz Formation. Correlations withother boundary strata in the Canadian Cordillera suggest theoptimum area for further testing ichnofossil ranges is in theMackenzie Mountains. Intercontinental correlations are alsoattempted.

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