rock is the limestone in the original name of Canberra "Limestone Plains". The Narrabundah Ashstone is part of this formation and can be seen in the easternmost corner. In the higher west including Mount Pleasant is grey quartz andesite from the Ainslie Volcanics. Around Australian Defence Force Academy is grey dacite from the Ainslie Volcanics. Geology of the Australian Capital Territory covers more of the geology of the ACT. References External link Suburbs of Canberra