I could be (as usual) a long long way off track, but there was a Greg’s Flat in 1870. This was in the then Dungog Police District, and according to the 1870 NSW ER for THE WILLIAMS, this was the residential address for a chap named Angus McFadyen and also a chap named Edward Stanton, junior …. May I note that Edward Stanton, senior is on that same roll, and his residence was at Canningalla (also in Dungog PD)
Same 1870 roll there’s a Jeremiah BYRON residence Bendolba (Dungog PD) …. ….. …. So I then looked up Grevilles 1875 PO directory for Dungog ….. Jeremiah BYRON, farmer, Bendolba and I note that there’s none with the surname BROWN listed in the directory as at Dungog
Cheers, JM