This web map has been developed as a pilot project for Geohistory/Géohistoire, the Canadian Historical GIS Partnership Development Project geohist.ca.on behalf of the Lost Rivers of Toronto Project www.lostrivers.ca.
The historical map overlay used for reference is a map by A.P. Coleman: The Pleistocene of the Toronto region: Including the Toronto interglacial formation, created by the Province of Ontario Department of Mines in 1932, drawn on top of the Topographic Base map of 1931. The legend appears near the top left hand corner of the map. Noticeable features include: the light orange area identified as "Iroquois sand and clay" and the darker orange boundary which demarcates the shoreline of glacial Lake Iroquois; and the "Gravel bars" (dark orange areas with red dots) deposited along that shoreline.