Canada

The Battle Formation (Edmonton Group) (up to 14m thick) consists of dark grey to purplish black bentonites and bentonic shales with thin interbedded, rooted, siliceous paleosols, erroneously referred to as tuffs. Like the Whitemud, its sediments are thought to have been deposited in very -low-gradient alluvial plain to paludal environments during a period of frequent volcanic erruptions.

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