The oldest rock unit above the Precambrian basement in the Waterways area of northeastern Alberta has long been named the Methy formation. A type core section and detailed lithologic description of this dolomitized reef are given. Criteria found useful in identifying subsurface reef developments are enumerated. Fossils of Middle Devonian age enable the Methy dolomite to be correlated with the Winnipegosan, Presqu’ile, and Ramparts formations of western Canada.

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