Cape Lamb

Vega Island () is an island in Antarctica, long and wide, which is the northernmost of the James Ross Island group and lies in the west part of Erebus and Terror Gulf.
It is separated from James Ross Island by Herbert Sound and from Trinity Peninsula by Prince Gustav Channel.

Location

Vega Island is in Graham Land, to the southeast of the Trinity Peninsula, which is the tip of the Antarctic Peninsula.
Erebus and Terror Gulf is to the east.
James Ross Island is to the south, and the Ulu Peninsula of James Ross Island is to the west, separated from Vega Island by the Herbert Sound.
The Prince Gustav Channel separates it from Corry Island and Eagle Island to the north.
Cape Gordon is at the east end of the island.

Sailing directions

The US Defense Mapping Agency's ''Sailing Directions for Antarctica'' (1976) describes Vega Island as follows:

Name

Vega Island was named by Dr. Otto Nordenskjöld, leader of the Swedish Antarctic Expedition (SwedAE; 1901–04), apparently for the ship ''Vega'' used by his uncle, Baron A.E. Nordenskjold, in making the first voyage through the Northeast Passage between 1878 and 1879.

Geology

Vega Island is a volcanic island of the James Ross Island Volcanic Group. As can be observed in limited outcrops, Vega Island consists of the deeply eroded volcanic deposits of tuff cones and lava-fed, volcanic deltas. So far, these volcanic deposits have been dated at being 2, 2.67, and 5.42 Ma. They rest upon well- bedded sandstones and mudstones ranging in age from Cretaceous to Paleogene periods. These sedimentary strata outcrop near the islands's base and as bluffs along its shoreline.

The lava-fed, volcanic deltas formed by the eruption of lava from a volcanic vent into a glacial lake formed by the prior melting of the ice cap in which the lake was contained. Initially, the underwater eruption resulted in volcanic breccia and basaltic pillow lava. As the volcanic deposits built up, the volcanic vent rose above lake level and erupted subaerially forming tuff cones and lava-feed, volcanic deltas that built out into the glacial lake. The basaltic lava flows form a caprock along the northwest shore, which forms an impermeable layer that results in about sixty waterfalls on warm days.

In Vegas Island, the Cretaceous sedimentary strata outcrops primarily in Cape Lamb and False Island Point. The oldest Cretaceous strata consists of minor outcrops of highly bioturbated silty mudstones to silty sandstones of the Herbert Sound Member of the Santa Marta Formation. Widely exposed and overlying it are of fine-grained strata in Lamb Member of the Snow Hill Island Formation. The youngest exposed Cretaceous strata in Vegas Island belong to the Sandwich Bluff Member of the López de Bertodano Formation. This member consists of of a variety of sedimentary rock types, including thin conglomerates, pebbly sandstones, sandstones and mudstones, and contains slump sheets, hummocky cross-stratification and rare rootlet horizons. The Sandwich Bluff Member is exposed almost entirely along the flanks of Sandwich Bluff in an outcrop that is approximately long by wide.

Paleontology

The exposed Cretaceous strata make Vega Island is an important site for paleontology. The Cape Lamb Member of the Snow Hill Island Formation contains an extraordinarily abundant and diverse marine invertebrate macrofauna. This macrofauna is dominated by ammonoids (mostly ''Gunnarites antarcticus''), nautiloids, bivalves (mostly Pinna sp.), crustaceans, and serpulid worms. Fossil wood is also abundant in these strata along with a large variety of trace fossils preserved within concretions. the fossil bones of dinosaurs (''Iguanodontidae'') and birds (''Charadriiformes'') have been found in the Cape Lamb Member in 1986. The López de Bertodano Formation exposed at Sandwich Bluff is also an important locality for its fossils of high-latitude, latest Cretaceous terrestrial plants and vertebrates in the Southern Hemisphere. Vertebrate fossils found there include the fossils of mosasaurs, plesiosaurs ('' Mauisaurus sp.''), dinosaurs (''Hadrosauridae''), and birds (''Polarornis sp.'' and '' Vegavis iaai'').

Northern features

Northern features, from west to east, include:

Keltie Head

.
A rounded headland with vertical cliffs which rise to a small ice dome high, forming the northwest end of Vega Island.
Discovered by the SwedAE under Otto Nordenskjöld, 1901-04, and named by him for Sir John Scott Keltie, Secretary of the Royal Geographical Society, 1892-1915.

Sandwich Bluff

.
A flat-topped mountain, high, broken sharply at its west side by a steep dark bluff standing slightly west of center on Vega Island.
Discovered by the SwedAE under Otto Nordenskjöld, 1901-04.
Charted in 1945 by the FIDS, and so named because a horizontal snow-holding band of rock breaks the western cliff giving it the appearance of a sandwich when viewed from the north.

Vertigo Cliffs

.
Spectacular, near vertical cliffs on the north coast of Vega Island.
The cliffs rise to about high and extend west for from Cape Well-met, broken by a cirque near the west end.
Named allusively by the UK Antarctic Place-Names Committee (UK-APC) in 1987.

Cape Well-met

.
A dark, conspicuous headland near the center of the north side of Vega Island, close south of Trinity Peninsula.
Cape Well-met was discovered and named by the SwedAE, 1901-04-
The name commemorates the long delayed union at this point of a relief party under Doctor Johan Gunnar Andersson and the winter party under Doctor Otto Nordenskjöld after twenty months of enforced separation.

Cape Gordon

.
A jagged headland high high, forming the east end of Vega Island.
Discovered by a British expedition 1839-43, under James Clark Ross, and named by him for Captain William Gordon, RN, a Lord Commissioner of the Admiralty

Southern features

Southern features, from west to east, include:

Cape Lamb

.
A cape which forms the southwest tip of Vega Island.
It was discovered by the SwedAE, 1901-04, under Otto Nordenskjöld.
It was resighted in 1945 by the Falkland Islands Dependencies Survey (FIDS), and named after Ivan Mackenzie Lamb (1911-90), botanist on the FIDS staff at Port Lockroy, 1944; at Hope Bay, 1945; leader of biological expedition to Melchior Islands, 1964-65.

Léal Bluff

.
A rounded bluff rising to high, inland from Cape Lamb in the southwest part of Vega Island.
It was named by the Argentine Antarctic Expedition after Mayor Jorge Leal, deputy leader at the Argentine Esperanza Base in 1947.

False Island Point

.
A headland long and wide, which is connected by a low, narrow, almost invisible isthmus to the south side of Vega Island.
First sighted in February 1902 and charted as an island by the SwedAE under Otto Nordenskjöld.
It was determined to be a part of Vega Island in 1945 by the Falkland Islands Dependencies Survey (FIDS), who applied this descriptive name.

Pastorizo Bay

.
A bay wide, indenting the south side of Vega Island just west of Mahogany Bluff.
The name appears on an Argentine chart of 1959.

Mahogany Bluff

.
A rocky bluff southwest of Cape Gordon, forming the east side of Pastorizo Bay.
So named by UK-APC because of the striking deep red-brown color of the bluff.

References

Sources

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{{Authority control

Paleontological sites of Antarctica
Argentine Antarctica
British Antarctic Territory
Chilean Antarctic Territory
Islands of the James Ross Island group