The Morozumi Range () is a mountain range in the Usarp Mountains of North

Victoria Land Victoria Land is a region in eastern Antarctica which fronts the western side of the Ross Sea and the Ross Ice Shelf, extending southward from about 70°30'S to 78°00'S, and westward from the Ross Sea to the edge of the Antarctic Plateau. It ...

, Antarctica. It extends northwest–southeast for , with its northern elevations overlooking the convergence of Gressitt Glacier and

Rennick Glacier Rennick Glacier is broad glacier, nearly long, which is one of the largest in Antarctica. It rises on the polar plateau westward of Mesa Range and is wide, narrowing to near the coast. It takes its name from Rennick Bay where the glacier reaches ...

Early exploration and name

The Morozumi Range was mapped by the

United States Geological Survey The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, ...

from surveys and

United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...

air photos in 1960–63. It was named by the

Advisory Committee on Antarctic Names The Advisory Committee on Antarctic Names (ACAN or US-ACAN) is an advisory committee of the United States Board on Geographic Names responsible for recommending commemorative names for features in Antarctica. History The committee was established ...

(US-ACAN) for Henry M. Morozumi, an aurora scientist at South Pole Station in 1960, and Station Scientific Leader at

Byrd Station The Byrd Station is a former research station established by the United States during the International Geophysical Year by U.S. Navy Seabees during Operation Deep Freeze II in West Antarctica. History A joint Army, Navy, Air Force, and Marin ...

in 1963.

Geology

The Morozumi Range is in the Rennick Graben, separated by the Rennick Faults from the Wilson Group rocks of the USARP mountains. Basement rocks are low-grade metasedimentary rocks that include greywacke-shale. The northern end holds the Adamellite Massif, a pluton of Granite Harbour Intrusives.

Glaciers

Gressitt Glacier

. A broad glacier, about 45 mi long, draining the area between Daniels Range and

Emlen Peaks The Emlen Peaks () is a group of scattered peaks and nunataks, long and wide. It is south of Daniels Range in the south end of the Usarp Mountains in northern Victoria Land, Antarctica. Early exploration and name Emlen Peaks was mapped by the ...

in the Usarp Mountains and flowing northeast to enter the

just north of the Morozumi Range. Mapped by USGS from surveys and U.S. Navy air photos, 1960–63. Named by US-ACAN for biologist J. Linsley Gressitt, Program Director who made biological studies, particularly in the Ross Sea area, in six austral summers, 1959-60 to 1965-66.

Rennick Glacier

. A broad glacier, nearly long, which is one of the largest in Antarctica. It rises on the polar plateau westward of

Mesa Range The Mesa Range () is a range of flat-topped mesas comprising the Sheehan, Pain, Tobin and Gair Mesas, situated at the head of the Rennick Glacier in Victoria Land, Antarctica. it was given this descriptive name by the northern party of the New ...

and is wide, narrowing to near the coast. It takes its name from Rennick Bay where the glacier reaches the sea. The Rennick Glacier flows north between the east side of the Morozumi Range and the west side of the

Lanterman Range The Lanterman Range () is a mountain range about long and wide, forming the southwest part of the Bowers Mountains in Antarctica. It is bounded by the Rennick Glacier, Sledgers Glacier, Black Glacier and Canham Glacier. Exploration and namin ...

Features

Features from north to south are:

Graduation Ridge

. A high rock ridge north of El Pulgar, forming the north extremity of Morozumi Range. Mapped by USGS from surveys and U.S. Navy air photos, 1960-63. The ridge was visited by NZGSAE, 1967–68, who gave the name because geologist J.A.S. Dow received his exam results here.

El Pulgar

. A precipitous granite monolith, high, standing north of Berg Peak in northern Morozumi Range. The feature was climbed by four members of NZGSAE, 1967-68, who gave the name El Pulgar (Spanish for "the thumb").

Mount Twomey

. A somewhat detached peak over high situated on the northwest margin of the Morozumi Range, northwest of Berg Peak. Mapped by USGS from surveys and U.S. Navy air photos, 1960-63. Named by US-ACAN for Arthur A. Twomey, USARP geologist at McMurdo Station, 1967-68 and 1968-69.

Sickle Nunatak

. A nunatak at the north side of the entrance to Jupiter Valley, on the east side of the Morozumi Range. So named by members of the NZGSAE, 1967-68, because of its shape.

Berg Peak

. A prominent peak, high, standing south of El Pulgar in northern Morozumi Range. Mapped by USGS from surveys and U.S. Navy air photos, 1960–63. Named by US-ACAN for Thomas E. Berg, geologist who wintered at McMurdo Sound in 1961, and spent three succeeding summer seasons making patterned ground studies in the area. Berg perished in the crash of a U.S. Navy helicopter near Mount McLennan, Nov. 19, 1969.

Jupiter Amphitheatre

. A steep-walled valley in eastern Morozumi Range. The valley is occupied by a glacier and is entered between Sickle Nunatak and Mount Van Veen. Mapped by USGS from surveys and U.S. Navy air photos, 1960-63. The name was applied by the NZGSAE during the 1967-68 season.

Mount Van Veen

. A precipitous, mainly ice-free mountain rising to at the south side of Jupiter Amphitheatre in the Morozumi Range. Mapped by USGS from surveys and U.S. Navy air photos, 1960-63. Named by US-ACAN for Richard C. Van Veen, USARP geologist at McMurdo Station, 1967-68.

DeGoes Cliff

- A steep rock cliff on the west side of Morozumi Range. The cliff is over long. Its northern end is southwest of Mount Van Veen. Mapped by USGS from surveys and U.S. Navy air photos, 1960-63. Named by US-ACAN for Louis DeGoes of the National Academy of Sciences, Executive Secretary of the Committee on Polar Research, National Research Council.

Paine Ridge

. A saber-shaped ridge largely composed of bare rock, extending southward from DeGoes Cliff at the SW end of the Morozumi Range. Mapped by USGS from surveys and U.S. Navy air photos, 1960-63. Named by US-ACAN for Roland D. Paine, Public Information Officer, National Science Foundation, who worked at McMurdo Station, 1960-61 and 1968-69.

References

Sources

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