Adelaide Avenue, Perth Avenue, Hobart Avenue and Darwin Avenue with Brisbane Avenue, Sydney Avenue not even being close. The streets which surround the hill in concentric circles are named after increasing spheres of influence with the inner-most circle called Parliament drive and then spanning out to Capital Circle, State Circle, National Circuit, Dominion Circuit and Empire Circuit. When Griffin drew up his plans in 1912, there was still some optimism that New Zealand might join the Federation of Australia. Griffin's plans included eight avenues radiating out from Capital Hill named after the capitals of the six states, the capital of the Northern Territory and the capital of New Zealand. Before the name Wellington Avenue was gazetted, it was realised that New Zealand was not going to become part of a Confederation of Australasia and the name was replaced by Canberra Avenue. Griffin planned that the state capital city avenues were terminated with a park named after the generic botanical name for a native plant from that particular site; for example, Telopea Park is named after the waratah, the floral emblem of New South Wales, and is at the end of Sydney Avenue, named after the capital of New South Wales. The name of the precinct of Manuka is a remnant of Griffin's naming scheme. Another remnant of Griffin's nomenclature was the Wellington Hotel, formerly on the corner of Canberra Avenue and National Circuit, which was demolished and replaced by the hotel known as of 2007 as Rydges Capital Hill Canberra. Geology The geology of Capital Hill has been studied in great detail. Canberra Formation, calcareous Shale is found in the south west and north east. This overlies middle Silurian Camp Hill Sandstone. The sandstone unconformably overlies the early Silurian Black Mountain Sandstone and State Circle Shale. State Circle Shale is Late Llandovery in a more finely divided time scale and has been dated to 445.7 million years old. The State Circle Shale is composed of laminated shales and siltstone. Black Mountain Sandstone is composed of a white quartz sandstone. The Deakin Fault cuts the south west of state circle. Mount Painter acid volcanoes are to the south west of this fault. See also Capital Circle References Suburbs of Canberra