ISSN:0028-8306    

DOI:10.1080/00288306.1967.10426741

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

The Polar Plateau in this area is a rock surface thinly veneered with ice and lies at a height 8,000 to 11,000 ft above sea level. Three major groups of rocks are present: (1) Volcanics of late Tertiary and Quaternary age including kenyte and related rock types; (2) Volcanics (mostly basalt) of Triassic-Jurassic age with minor sediments; and (3) A basement complex consisting mostly of granite and gneissic granite digesting regional biotite schist of probable Precambrian age.

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10426742

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Fossils from Lyon Nunataks (74° 52′ S, 74° 02′ W) are described:Conodicoelitesspp.,Rotulariasp. indet., indet. pectinacean: cf.Entolium, andVariamussium lyonensissp. nov. Upper Jurassic (?Lower Kimmeridgian) age. TheConodicoelitesspp. have strong affinities with those of the New Zealand Lower Kimmeridgian. Ammonites, belemnites, andInoceramus, all with strong Indo-Pacific affinities, are present in the Kimmeridgian and Lower Tithonian of Central and South America, and the Lyon Nunataks fossils appear to be a southerly extension of this fauna. These fossil occurrences strongly suggest that a trans-Pacific migration route, probably skirting Antarctica, was available in Kimmeridgian and Lower Tithonian times. Faunal movements along this southern route are discussed in terms of: (1) Migration across existing oceans; (2) Migration between existing land masses, aided by connecting shelf areas; (3) Migration skirting formerly contiguous land masses. Continental drift is seen as a means of providing shallow-water migration routes between New Zealand, West Antarctica, and South America. Various continental reconstructions are considered, and one first published by King (1958) is preferred.

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10426743

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Rock weathering, movement of debris, glacial and fluvioglacial deposits and patterned ground in the McMurdo Sound region, are illustrated and briefly described.

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10426744

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10426745

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Many small areas of hot steaming ground occur near the summit of Mt Melbourne, and small, almost undissected, basaltic cones and mounds are found on the flanks and in the crater of the volcano. All the recent volcanic landforms are composed of glassy trachyandesite. The presence of ash layers in ice-cliffs and nearby glaciers indicates that Mt Melbourne must have erupted within the last few thousand years, and the geomorphic evidence suggests a long period of activity before this.

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10426746

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Soil distribution on Mt Erebus is restricted by the extensive ice and snow cover and by the rugged topography. Soil occurrence is limited to rock exposures, to areas kept free of ice by the hot vapours and heat of fumaroles, and to areas near the active crater. The soils of Mt Erebus are lithosols, and because of their acid reaction are unique among the soils of South Victoria Land, the Commonwealth Range, and the Bunger Oasis. Also, the mineral assemblage of these lithosols includes minerals not yet reported among the little-studied Antarctic soils. These outstanding characteristics are related to the hydrothermal processes associated with the volcanic activity of the region.

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10426747

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Three distinct types of small magnitude events have been observed at Wilkes. These are tentatively attributed to “ice-quakes” and earthquakes within a large glacier-filled trench close to Wilkes.

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10426748

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Three species of Pectinidae are now known from three separate fossiliferous deposits in the McMurdo Sound area of Antarctica. Only one of these,Adamussium colbecki(Smith), is known to be living at the present time. This species is also found in the Taylor Formation, the youngest formation in the area.Chlamys(Zygochlamys)anderssoni(Hennig) occurs in the Scallop Hill formation, which is considered older than the Taylor Formation because it has been glaciated, whereas the Taylor Formation has not. The third is a new species,Chlamys(Zygochlamys)tuftsensis, from the deposit of the Pecten Glaciation located far up Wright Valley. Because of the unconsolidated nature of this deposit it may be younger than the consolidated Scallop Hill Formation. It is definitely older than the Taylor Formation.

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10426749

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Plants from the Permian and Triassic of Allan Nunatak, Victoria Land, East Antarctica, and Triassic plants from Mt Bumstead at the head of the Mill Glacier and from the Shackleton Glacier, are considered along with Jurassic plants from Carapace Nunatak. From the Permian,Glossopteris communisFeistmantel,G. cordataDana, andCistella strictaPlumstead are described; and from the Triassic,Dicroidium odontopteroides(Morris) Gothan,D. feistmanteli(Johnston) Gothan,D. dutoitiisp. nov., cf.Diplasiophyllum acutum(Walkom) Frenguelli, cf.“Johnstonia”trilobitaJones and de Jersey,Xylopteris elongata(Carruthers) Frenguelli, andRissikia media(Tenison Woods) Townrow. Jurassic plants areOtozamites antarcticusPlumstead,Nothodacrium warreniiTownrow,Masculostrobus warreniiTownrow, withTsugaepollenitescf.trilobatus(Balme) Dettmann, and an undescribed species ofBrachyphyllumBrongniart associated with pollen ofClassopollisPflug. It is concluded that the Jurassic plants are probably Middle Jurassic, the Triassic ones Upper or late Middle Triassic, and the Permian ones probably Upper Permian. Attention is drawn to the fact that to date there is no Lower Triassic flora known from Antarctica. The Allan Nunatak succession is compared with the Beardmore — Shackleton Glacier succession, and some similarities with the Tasmanian Triassic are pointed out.

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10426750

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor