First Oil Wells in Canada
The presence of oil in this locality was observed by early travellers and by the pioneer farmers who used it for medical purposes. In 1858, near Oil Springs, James M. Williams dug the first oil well in Canada and later established a refinery at Hamilton. In 1861, John Shaw, by drilling into the rock, opened the first flowing well, its situation being Lot 18, Concession 2, Enniskillen Township. From these beginnings developed one of Canada's most important industries.
Plaque via Alan L. Brown's site Ontario Plaques. Full page here.