In many lakes, especially those near ice-sheets, formations called varves—banded layers of silt and sand—are deposited annually. Course and pale material is left in summer, while finer, darker material is left in winter. One light band and one dark band make up a varve. Just as tree rings may be counted to reveal the age of a tree, varved layers of clay may be counted to determine the age of a glacial deposit. Butler Lake Nature Reserve features an eight-metre section of varved clays deposited by the postglacial Lake Agassiz. Park Facilities and Activities There are no visitor facilities. Access is via Wabigoon Lake.
Location: Ten kilometres southeast of Dryden.