Abstract

The Middle Proterozoic Dismal Lakes Group provides a rare example of Precambrian paleokarst which contains a remarkably complete spectrum of solutional, precipitative, and depositional features. The Dismal Lakes Group is a 1.5-km siliciclastic to carbonate succession that records dominantly stable peritidal carbonate sedimentation along the northwestern margin of the Canadian Shield. Karst features are widespread along a regionally extensive subaerial exposure surface associated with regression near the end of Dismal Lakes deposition, and are especially abundant near a depositional high developed earlier near September Lake.

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