Hello Russell, I have a marriage of a Mary Treseder and a James Spargo in the March qtr of 1852 in Stoke Damerel (Devonport) Devon. This may be them. Their daughter Mary Spargo was born in about 1856 in Ballarat, I have worked that out by knowing how old she was when she died in Adelaide in 1920. Mary Treseder is my Great Great great grandmother. I have tentative dates for Mary Treseder being born in 1827 and dieing around 1895. I have no information about her parents at all.