 The Yarralumla brickworks quarry and the Deakin anticline are places where the formation is exposed and easily studied.The area now called Yarralumla is part of two original land grants, which were granted to free settlers for the establishment of farms.In 1828 Henry Donnison, a Sydney merchant who had arrived with his wife and family on the brig "Ellen" on 29–30 July 1828, was granted an allotment on the western side of Stirling Ridge.