Onley Hill

Mount Henderson () is a mountain in the Framnes Mountains of Mac. Robertson Land in the Antarctic.
It is southeast of Holme Bay and northeast of the Masson Range.

Physical

Mount Henderson is a massive mountain rising through the ice sheet southeast of Holme Bay and a like distance northeast of the north end of the Masson Range.
The mountain is about south-southeast of Mawson Station.
The rocky massif covers about .
Its ridges rise to about above sea level.

There are large areas of moraine and moraine scree slopes, and large melt lakes between the ridges.
Glacial erratic boulders of light-colored granitic gneiss cover the lower slopes of the mountain, but are not found more than about above the present-day ice surface. Above this level the darker charnockite bedrock is exposed. Probably the boulders were transported and deposited by ice during the last glacial maximum, while the exposed bedrock would have remained above the ice.

Botany

Thirteen species of lichen and one of moss ('' Grimmia lawiana'') have been collected in the Mount Henderson area.
On the scree slope below Goldsworthy ridge at an elevation of about there is abundant lichen and moss. '' Buellia frigida'' is the most common lichen, extending deep into sheltered crevices between rocks in association with '' Xanthoria mawsonii'' and '' Protoblastenia citrina''.
There are large patches of ''Caloplaca elegans''.
On the southeast corner of the massif there are dense cushions of ''Biatorella antarctica'', which is also plentiful on the summit, as are '' Buellia frigida'' and ''Caloplaca elegans var. pulvinata''.
The lichen ''Gasparrinia harrisoni'' has been found growing on Mount Henderson less than from the line where the ice meets the rock.
Patches of this lichen were found in places where there is little direct sunlight at any time of the year, and where the rock is usually very dry.

Exploration

Mount Henderson was seen for the first time from the crow's nest of the ''Discovery'' on 3 January 1930, during the British Australian and New Zealand Antarctic Research Expedition (BANZARE) (1929–31).
It was seen again from the airplane on 5 January 1930.
The mountain was visited in February 1931 by BANZARE under Douglas Mawson, who named it after W. Henderson, Director of the Australian Department of External Affairs and a member of the Australian Antarctic Committee, 1929.

Features

Features include the Goldsworthy Ridge in the north, Onley Hill in the south, and Fischer Nunatak south of the massif.

Goldsworthy Ridge

. Ridge extending north from Mount Henderson in the northeast part of the Framnes Mountains, Mac. Robertson Land.
Mapped by Norwegian cartographers from air photos taken by the Lars Christensen Expedition, 1936-37.
Named by ANCA for R.W. Goldsworthy, survey field assistant with ANARE (Nella Dan) in 1962.

Onley Hill

. A bare rock hill, , standing south of Mount Henderson in the northeast part of the Framnes Mountains, Mac. Robertson Land.
Mapped by Norwegian cartographers from air photos taken by the Lars Christensen Expedition, 1936-37, and named Sorkollen (the south knoll).
Renamed by Antarctic Names Committee of Australia (ANCA) for L. Onley, weather observer at Mawson Station in 1959. Not: Sorkollen.

Fischer Nunatak

. Nunatak, 750 m, standing 2 mi S of Mount Henderson in the NE part of the Framnes Mountains, Mac. Robertson Land. Mapped by Norwegian cartographers from air photos taken by the Lars Christensen Expedition, 1936-37, and named Sornuten (the south peak). Renamed by ANARE for H.J.L. Fischer, cook at Mawson Station in 1958. Not: Fisher Nunatak, Somuten.

References

Sources

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{{DEFAULTSORT:Henderson, Mount
Mountains of Mac. Robertson Land