I am looking for information on John Dickson, my g-g-grandfather. He was born 1830 in Edinburgh. He married Martha Drysdale on 18 Nov 1850 at St Cuthbert's, Edinburgh. Sometime between 1850 and 1854 they migrated to Australia. All six children were born in Chilwell, Ballarat, Sebastopol (towns in Victoria, Australia). I haven't located his marriage certificate or birth certificate.