In many lakes, especially those near ice-sheets, formations called varves -- banded layers of silt and sand -- are deposited annually. These sediment layers, laid down by the lake over many years, reveal bands of light and dark material. When the layers are counted they suggest the age of the deposit and can tell much about the history of the lake in the immediate post-glacial era. This nature reserve contains the type section for the Connaught varved clays of the Barlow-Ojibwa Formation. Accessible by water only, the park has no visitor facilities.