Curtin has much Mount Painter Volcanics dark grey to grey green crystal
tuff. Some cream
rhyolite is found in the far east along Yarralumla creek, which runs through the edge of the suburb. Sediments such as
shale and
sandstone are found in the far north east corner, north of Yarralumla creek. To the west of Curtin there are horse paddocks that contain sequence of rocks getting younger as you head west. First a band of Mount Painter Volcanics cream
rhyolite, followed by a band of Yarralumla Formation calcareous
shale, followed by Deakin Volcanics purple and green tuff, and lastly Deakin Volcanics green-grey and purple rhyolite. All of these rock types are from the
Silurian age. ==Features==