Throsby is a designated suburb of Canberra

Canberra

Canberra is the capital city of Australia. With a population of over 345,000, it is Australia's largest inland city and the eighth-largest city overall. The city is located at the northern end of the Australian Capital Territory , south-west of Sydney, and north-east of Melbourne...

, Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

 in the district of Gungahlin. The suburb is adjacent to the suburbs of Kenny

Kenny, Australian Capital Territory

Kenny is a designated suburb in the Canberra, Australia district of Gungahlin. The suburb is named in honour of Elizabeth Kenny, an Australian who pioneered muscle rehabilitation practices which serve as the foundation of physiotherapy...

 and Harrison

Harrison, Australian Capital Territory

Harrison is a suburb of the district of Gungahlin in Canberra, Australia. The suburb is named after the former city planner Peter Harrison, who was instrumental in reviving Walter Burley Griffin's plan for the National Capital. The suburb is adjacent to the suburbs of Franklin, Gungahlin, Throsby,...

 and is bounded by the Federal Highway to the east, the ACT/NSW border to the north, Horse Park Drive to the south and the Goorooyarroo nature reserve to the west. The suburb is named after the explorer Charles Throsby

Charles Throsby

Charles Throsby was an Australian explorer, pioneer and parliamentarian. He opened up much new land beyond the Blue Mountains for colonial settlement. He was a grazier, and became a prominent member of New South Wales society.- Early life :...

 who was one of the first Europeans to open up the lands west of the Blue Mountains

Greater Blue Mountains Area

The Greater Blue Mountains Area is a World Heritage Site in the Blue Mountains of New South Wales, Australia. It was inscribed on the World Heritage List at the 24th Session of the World Heritage Committee, held in Cairns from 27 November to 2 December 2000...

 to grazing and agriculture.

Geography

The cleared part of the suburb has two arms, the east arm is the head of Sullivans Creek, and there is a larger northern arm. The high point of Throsby is 656 meters near 'Old Joe' Hill on the easterly arm. The low point of the suburb when it is built is 610 meters where the creek drains towards the east.

Geology

The rocks in Throsby are from the Canberra Formation, which is middle Silurian

Silurian

The Silurian is a geologic period and system that extends from the end of the Ordovician Period, about 443.7 ± 1.5 Mya , to the beginning of the Devonian Period, about 416.0 ± 2.8 Mya . As with other geologic periods, the rock beds that define the period's start and end are well identified, but the...

 in age. The rocks are sedimentary shale

Shale

Shale is a fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments of other minerals, especially quartz and calcite. The ratio of clay to other minerals is variable. Shale is characterized by breaks along thin laminae or parallel layering...

s and mudstones, which have been modified by pressure and folding. The rock in the hills to the east (including Old Joe) is grey quartz andesite

Andesite

Andesite is an extrusive igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture. In a general sense, it is the intermediate type between basalt and dacite. The mineral assemblage is typically dominated by plagioclase plus pyroxene and/or hornblende. Magnetite,...

from the Ainslie Volcanics.