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The AAPG/Datapages Combined Publications Database
CSPG Bulletin
Abstract
Early Middle Cambrian Formations in the Front Range Near Ghost River, Alberta
ABSTRACT
Early Middle Cambrian rocks that appear above the McConnell and Costigan thrust faults in the Front Range of the Rocky Mountains between South Ghost River and Burnt Timber Creek are coeval with the Cathedral and Stephen Formations of the Main Ranges sub-province. The Stephen and the upper part of the Cathedral show a similar development to the type section whereas equivalents of the lower part of the Cathedral comprise a sandstone-shale-limestone sequence unlike carbonates of the same age at the type section and are considered to represent the basal diachronic clastic unit of the transgressing Cambrian sea. This unit is lithologically similar to Lower Cambrian and basal Middle Cambrian strata to the west, and to late Middle Cambrian formations in the east.
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