1. Lake Simcoe District, Ontario Pleistocene and recent deposits and bedrock outcrops / [cartographic material] Yale Public content 1950. 2012-07-25T14:12:39Z. 2012-07-25T14:43:24Z. Deane, R.E. Canada Dept. of Mines and Technical Surveys, Geological Survey of Canada. English. Public. Ontario and Lake Simcoe Region. Pleistocene and Holocene.