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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 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