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Southwestern Canada was located in the tropics during the Cambrian and Ordovician, with the western part of the craton of the Canadian shield covered by shallow seas. Carbonates accumulated in these warm seas in the Middle Cambrian-Middle Ordovician, together with terrigenous detritus carried by rivers from the craton to the east. Thick carbonates developed in the outboard parts of the carbonate platform, facing the deeper waters of the bordering oceanic trough; thicknesses total some 4000 m ( 13,000 ft). The outboard edge of the carbonate platform varied in position with time. In the south, for most of the...

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