two-storey houses, and more expansive gardens. The streets in this part of the suburb are typically lined with native trees. Yarralumla is located on the Yarralumla Formation which is a mudstone/siltstone formation that was formed around 425 million years ago during the Silurian Period. The formation extends from Red Hill and Woden in the South to Lake Burley Griffin in to the north, passing under the suburb of Yarralumla. The formation is evidence of the last major marine sedimentary period when eastern Australia was still covered by shallow seas. It shows fossil evidence of trilobites, coral and primitive crinoids. The Yarralumla brickworks quarry and the Deakin anticline are places where the formation is exposed and easily studied. History European settlement Like the rest of Canberra, Yarralumla forms part of the traditional lands of the Ngunnawal people. The area now called Yarralumla is part of two original land grants made to free settlers for the establishment of farms. In 1828 Henry Donnison, a Sydney merchant who had arrived on the brig Ellen with his wife and family on 29–30 July 1828, was granted an allotment on the western side of Stirling Ridge. The name 'Yarralumla' was first used on a map by the surveyor Robert Dixon in 1829. A second grant was made to William Klensendorlffe (a German who had served in the British Navy and arrived free in the Colony in 1818), who had bought the land from John Stephen, on 7 March 1839. Donnison's land was named Yarralumla in a survey of the area conducted in 1834. Yarralumla or Yarrowlumla was a name used by the local people for the Mount Stromlo ridge, which lies to the west of the current suburb. It is said to mean "echo mountain". An area to the west of what is now the suburb was the Yarrolumla parish. The prominent New South Wales parliamentarian Sir Terence Aubrey Murray (1810–1873) purchased Yarralumla in 1837. He lived there with his wife Mary (née Gibbes, 1817–1858), the second daughter of the Collector of Customs for New South Wales, Colonel John George Nathaniel Gibbes (1787–1873), MLC. Murray settled Yarralumla and part of Winderradeen (near Collector) on his wife in trust so that they would have some property if he became bankrupt. On his wife's death in 1858 Yarralumla passed in trust to her father and her brother Augustus Onslow Manby Gibbes (1828–1897). In May 1859, Augustus' parents