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13 Feb 1870 birth of John Gilmore Garnett
Ontario Vital Records 1870 Births Cavan Twp, Durham Co., no.10802

According to the Ontario Locator http://www.geneofun.on.ca/db.php there is only one Cavan, which is Cavan Twp now in Peterborough Co.  The record shows it in the United Counties of Northumberland & Durham.  Apparently it was part of Durham Co. until 1973.

Source: FHL 1844885, Archives of Ontario MS929_3