Turnstile Ridge () is a ridge about long, lying north of Westhaven Nunatak at the northwest extremity of the Britannia Range.

Name

Turnstile Ridge was so named by the Darwin Glacier Party (1957) of the

Commonwealth Trans-Antarctic Expedition The Commonwealth Trans-Antarctic Expedition (CTAE) of 1955–1958 was a Commonwealth-sponsored expedition that successfully completed the first overland crossing of Antarctica, via the South Pole. It was the first expedition to reach the South ...

(CTAE) because snow passages resembling turnstiles occur throughout its length.

Location

Turnstile Ridge is south of the

Darwin Névé Darwin Névé () is a large névé in Antarctica. It is on the west side of the Cook Mountains and the Darwin Mountains and feeds both Darwin Glacier and Hatherton Glacier. It was named for its association with Darwin Glacier by the New Zealand Da ...

and southwest of the

Meteorite Hills The Meteorite Hills () are a group of hills, long, forming the western portion of the Darwin Mountains in Antarctica. The hills are located between the heads of Darwin Glacier and Hatherton Glacier. The name was proposed by John O. Annexstad of ...

of the

Darwin Mountains The Darwin Mountains is a group of mountains between the Darwin and Hatherton glaciers in Antarctica. Discovered by the British National Antarctic Expedition (1901–04) and named for Major Leonard Darwin, at that time Honorary Secretary of the R ...

. It is west of the head of the

Hatherton Glacier Hatherton Glacier is a large glacier flowing from the Antarctic polar plateau generally eastward along the south side of the Darwin Mountains and entering Darwin Glacier at Junction Spur. It was mapped by the Darwin Glacier Party of the Commonwe ...

, which forms the boundary between the

and the Britannia Range, The Westhaven Nunatak is southwest of Turnstile Ridge. Haven Mountain and the Three Nunataks lie further to the south. A largely ice-free line of ridges and valleys extends to the southeast of Turnstile Ridge along the south side of the Hatherton Glacier. This includes Abus Valley, Banna Peak, Banna Ridge, Bellum Valley, Bibra Valley and Danum Platform. Many of the nearby features were named in association with Britannia by a

University of Waikato The University of Waikato ( mi, Te Whare Wānanga o Waikato), is a Public university, public research university in Hamilton, New Zealand, Hamilton, New Zealand established in 1964. An additional campus is located in Tauranga. The university perfo ...

(New Zealand) geological party, 1978-79, led by M.J. Selby.

Features

Features to the south and southeast include:

Westhaven Nunatak

. A prominent nunatak, high, standing south of Turnstile Ridge in the northwest part of Britannia Range. It is the westernmost rock outcrop in this part of the range. The Darwin Glacier Party of the CTAE set up a survey station on its summit in December 1957. The name was suggested by Squadron-Leader J.R. Claydon, RNZAF, who first saw the feature from the air.

Haven Mountain

. A prominent mountain, high, with a level razor-back snow ridge at its highest (eastern) part, standing northeast of Three Nunataks. So named by the Darwin Glacier Party of the CTAE (1956-58), who sheltered for five days in the largely snow-free area below the north side of the summit ridge.

Three Nunataks

. Three nunataks, largely ice covered, lying southwest of Haven Mountain at the northwest edge of the Britannia Range. Named by the Darwin Glacier Party of the CTAE, 1956-58.

Abus Valley

. An ice-free valley southeast of Turnstile Ridge. Abus is a historical place name formerly used in Roman Britain.

Banna Peak

. A peak high that surmounts the south end of Banna Ridge. Banna is a historical placename formerly used in Roman Britain.

Banna Ridge

. A rock ridge that rises over high and extends from Banna Peak northeast toward the head of Hatherton Glacier. The ridge forms the southeast wall of Abus Valley. Named in association with Banna Peak by a University of Waikato geological party, 1978-79.

Bellum Valley

. A small valley east of Banna Ridge. The valley entrance is adjacent to the head of Hatherton Glacier. Bellum is a historical placename formerly used in Roman Britain.

Bibra Valley

. Ice-free valley bounded eastward by Danum Platform, lying northeast of Haven Mountain. Bibra is a historical place name formerly used in Roman Britain.

Danum Platform

. A mesa-like rock eminence northeast of Haven Mountain, forming the divide between Bibra Valley and Dubris Valley. Danum is a historical name used in Roman Britain for present-day Doncaster.

Dubris Valley

. A narrow ice-free valley just east of Danum Platform. Dubris is a historical name used in Roman Britain for a stream at Dover.

Isca Valley

. Narrow ice-free valley lying next west of Ituna Valley and east-northeast of Haven Mountain. Isca is a historical name used in Roman Britain for the River Exe.

Ituna Valley

. Narrow ice-free valley between Isca Valley and Lemanis Valley. The valley opens northward to Hatherton Glacier, west-northwest of Derrick Peak. Ituna is a historical name used in Roman Britain for the River Eden.

Venta Plateau

. A small plateau rising to high between the heads of Isca Valley and Lemanis Valley, located east of Haven Mountain. Venta is a historical name used in Roman Britain for present-day Winchester.

Lemanis Valley

. A partly ice-free valley intruded at the entrance by a lobe of ice from Hatherton Glacier, lying between Ituna Valley and Lindum Valley and west-northwest of

Derrick Peak Derrick Peak () is a prominent ice-free peak, high, overlooking the south side of Hatherton Glacier, 3 nautical miles (6 km) west of the north end of Johnstone Ridge. It was named by the Advisory Committee on Antarctic Names for Robert O. Derr ...

. Lemanis is an old Roman place name for Lymn in England.

References

Sources

* * * {{Include-USGov , agency=United States Geological Survey Britannia Range (Antarctica)