. The Canadian field-naturalist. \ ® ^---^-(S *—1 Springs (x} Sinkholes (approximate, not all shown) Remains of beaver dam (full extent not known). Horse Lake / , Former extent of Horse Lake lake Figure \. Sketch diagram of karst and Beaver dam between Horse and Marr lakes, Bruce Peninsula. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club

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