the right for the Red Hill polling place at Red Hill School in the 2022 federal and 2020 ACT elections. Geography The Red Hill ridge forms the south-west boundary of the suburb. The ridge separates the central Canberra valley from Woden Valley. The northernmost peak is Red Hill, the Davidson Trig is on the middle point, and Mount Mugga is on the southernmost point of the ridge across Hindmarsh Drive. The suburb occupies 4.87 km² and has a population density of 634/km². Geology The Red Hill ridge is said by geologists to be an "erosion residual" resulting from metamorphisis of sedimentary rock. The Yarralumla Formation sediments were toughened by thermal metamorphism from a small granite intrusion to the south thereby providing the resistant core of the ridge. The granite is deeply weathered and does not outcrop but is evident by the smooth slopes and deep red soils on the lower slopes to the north-west by the road to the Federal Golf Course. This intrusion is known as Federal Golf Course Tonalite. It is dated at 417±8 Mya. It is completely crystalline with mineral content of plagioclase, hornblende, biotite and interstitial quartz and no potash feldspar. The type of red soil is known as terra rossa. Rock location summary Mount Painter Volcanics dark grey to green grey dacitic tuff is found in all except the west. This includes most of the built up area. Yarralumla formation outcrops on Red Hill down to Mugga Way. The Federal Golf Course hanging off the west side of Red Hill also counts as part of the suburb. It has a Silurian tonalite intrusion under the whole course referred to as granite above. References External links Topographic map (pdf) of the Red Hill component of the Canberra nature park Calthorpes' House at Google Cultural Institute Obituary of Charles Russell, leaseholder of Red Hill, published by Jerrabomberra Volunteer Bushfire & Emergency Service Brigade Calthorpes' House - official site Boxford garden web site Suburbs of Canberra