 Three of these can be seen easily on Google Maps near Cameron Corner, where the New South Wales Lands Department surveyor John Brewer Cameron, who spent two years from 1880 marking the border between NSW and Queensland, erected a post in September 1880.The cause of this has been traced to surveyors' errors, variously due to differences between the Francis Edward Roberts and Isaiah Rowland survey between 1863 and 1865 and other surveys performed since then.The first discovery of incorrectly allocated land was in 1884 when surveyor Johnson was instructed to survey a Conditional Purchase (No.