Late Quaternary glacial history of the Hermitage area of southern Newfoundland

1983 ◽  
Vol 20 (3) ◽  
pp. 399-408 ◽  
Author(s):  
D. A. Leckie ◽  
S. B. McCann
Keyword(s):  
Sea Level ◽  
Late Quaternary ◽  
South Coast ◽  
Glacial History ◽  
The South ◽  
Ice Cap ◽  
Small Complex ◽  
History Of ◽  
Ice Field ◽  
Late Wisconsinan

During late Wisconsinan glaciation, the northern part of the Hermitage area was glaciated by Newfoundland-centred ice and the southern part by a small, complex, upland ice field, broken by nunataks. During deglaciation a lobe of Newfoundland ice dammed a lake at the head of Bay d'Espoir in which a series of small glaciolacustrine deltas were deposited. Valley glaciers from the southern ice cap reached the south coast at several locations, most notably near Harbour Breton, where a large glaciomarine delta was formed during deglaciation when sea level stood 22–24 m above present HWM. Except for three occurrences of till, no deposits were found that can be attributed to glacial events older than late Wisconsinan.

Late Quaternary Glacial History of the South Orkney Plateau, Antarctica

1990 ◽  
Vol 33 (3) ◽  
pp. 265-275 ◽  
Author(s):  
Margaret J. Herron ◽  
John B. Anderson
Keyword(s):  
Late Quaternary ◽  
The South ◽  
Ice Shelf ◽  
Radiocarbon Dates ◽  
Orkney Islands ◽  
Ice Cap ◽  
History Of ◽  
Seismic Records ◽  
Ice Conditions ◽  
History Of The South

AbstractPiston cores from the South Orkney Plateau penetrated overcompacted diamictons in water depths of up to 250 m. Detailed textural and petrological analyses of these diamictons indicate that they are basal tills. Seismic records from the plateau show a widespread surface of glacial erosion and provide additional evidence of an ice cap grounded to a depth of 250 m. Piston cores from the slope of the plateau penetrated diatomaceous muds resting directly on poorly sorted muds with very little to no biogenic material. The ice-rafted debris in these glacial-marine sediments is composed almost exclusively of material derived from the South Orkney Islands. This implies deposition beneath an ice shelf as opposed to iceberg rafting. In contrast, diatomaceous muds contain relatively abundant exotic iceberg-rafted material and reflect a glacial-maritime setting similar to that of today. The sharp contact separating diatomaceous surface sediments from basal tills and sub-ice shelf deposits indicates that the ice cap and ice shelf retreated from the plateau rapidly. Radiocarbon dates for diatomaceous muds from a glacial trough on the plateau indicate that the ice cap and ice shelf retreated from the plateau prior to 6000 to 7000 years ago. The homogeneity of surficial diatomaceous sediments suggests that sea ice conditions over the plateau have not changed radically since that time.

Late quaternary sedimentation and glacial history of the western Svalbard continental margin

1996 ◽  
Vol 133 (3-4) ◽  
pp. 123-156 ◽  
Author(s):  
Espen S. Andersen ◽  
Trond M. Dokken ◽  
Anders Elverhøi ◽  
Anders Solheim ◽  
Ingrid Fossen
Keyword(s):  
Continental Margin ◽  
Late Quaternary ◽  
Glacial History ◽  
History Of

scholarly journals ANALYSIS OF MAXIMUM SEA LEVELS IN SOUTHERN ENGLAND

1978 ◽  
Vol 1 (16) ◽  
pp. 53
Author(s):  
J. Graff ◽  
D.L. Blackman
Keyword(s):  
Sample Size ◽  
Sea Level ◽  
Linear Trend ◽  
South Coast ◽  
Annual Maximum ◽  
Return Periods ◽  
The South ◽  
Mean Sea Level ◽  
Sea Levels ◽  
Southern England

Along the south coast of England, series of observed annual maximum sea levels, ranging from 16 years to 125 years have been analysed for each of 10 ports. The Jenkinson method of analysis was used to compute the frequency of recurrence of extreme levels. For a number of these ports the series of annual maxima are shown to have significant trends of the same order as those for mean sea level. The Jenkinson method can be simply adjusted to cope with maxima having a component linear trend, making it possible to allow for such trends in computing the frequency of recurrence of extreme levels. If a trend in the annual maxima varies throughout the sample of observations it is shown that difficulties arise in using the Jenkinson method to compute acceptable statistics. It is also shown that for certain ports having long series of observed annual maxima it may be necessary to restrict the sample size of observations in order to compute estimates of the recurrence of extreme levels within reasonable return periods.

scholarly journals Glacial history of the Åsgardfonna Ice Cap, NE Spitsbergen, since the last glaciation

2021 ◽  
Vol 251 ◽  
pp. 106717
Author(s):  
Lis Allaart ◽  
Anders Schomacker ◽  
Nicolaj K. Larsen ◽  
Egon Nørmark ◽  
Tom Arne Rydningen ◽  
...  
Keyword(s):  
Glacial History ◽  
Ice Cap ◽  
Last Glaciation ◽  
History Of

scholarly journals On the Glacial History of Antarctica

1962 ◽  
Vol 4 (32) ◽  
pp. 173-195 ◽  
Author(s):  
J. T. Hollin
Keyword(s):  
Sea Level ◽  
Northern Hemisphere ◽  
World Wide ◽  
Ice Sheet ◽  
Time Lags ◽  
Glacial History ◽  
Ice Shelves ◽  
Field Evidence ◽  
Grounding Line ◽  
History Of

AbstractThe Antarctic Ice Sheet responds quickly to regime changes, and time lags in its fluctuations are relatively small. During the Pleistocene glacial stages of the Northern Hemisphere, world-wide temperature reductions reduced the plasticity of the ice sheet and made it thicker. The amount of thickening depended on the conditions at the ice base but it was small, for mechanical and thermal reasons. Also, during the northern stages, accumulation over Antarctica was probably less than now, but this too had little effect on the thickness of the ice sheet. The mass budget of the ice sheet alone, without the ice shelves, probably remained strongly positive; the ice sheet probably existed throughout the Pleistocene and is unlikely to disappear in the future. The area of the ice sheet is determined chiefly by the elevation of the “grounding line”, where the peripheral ice cliffs and ice shelves begin to float. During the northern stages, world-wide lowerings of sea-level displaced the grounding line downwards and northwards, and allowed the ice sheet to advance by amounts which account for nearly all the evidence for previous greater glaciations. In summary, the glacial history of most ice-free areas is governed not so much by climatic as by sea-level changes. Therefore, Antarctic glacial fluctuations were dependent on and in phase with those of the Northern Hemisphere. The field evidence from Antarctica has little bearing on the ultimate causes of glacial fluctuations, which might however be determined by field work on the planet Mars.

scholarly journals Unusually high sea level at the south coast of Japan in September 2011 induced by the Kuroshio

2020 ◽  
Author(s):  
Norihisa Usui ◽  
Koji Ogawa ◽  
Kei Sakamoto ◽  
Hiroyuki Tsujino ◽  
Goro Yamanaka ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Tide Gauge ◽  
Phase Speed ◽  
Japan Sea ◽  
South Coast ◽  
The South ◽  
Characteristic Analysis ◽  
The Japan Sea ◽  
The Kuroshio

Abstract Using a coastal assimilation model, generation mechanism of unusually high sea level (UHSL) at the south coast of Japan in September 2011 is investigated. Both model results and tide gauge observations indicate that sea level rise associated with the UHSL event occurred twice in the middle and end of September. The first one, which is localized around the eastern part of the Seto Inland Sea, is caused by a cyclonic circulation in the Kii Channel formed as a result of northward migration of the Kuroshio axis toward Cape Shionomisaki. The second sea level rise, which is the main contributor to this UHSL event, is observed in wide areas not only at the south coast of Japan, but also at the coast of the Japan Sea. It is brought about by a coastal trapped wave (CTW) induced as a result of a fluctuation of the Kuroshio path to the south of the Boso Peninsula. The CTW with positive SSH anomalies propagates westward along the south coast of Japan, and then goes into the coast of the Japan Sea. Sensitivity experiments and a modal characteristic analysis indicate that the CTW is mainly characterized by the first mode baroclinic Kelvin wave. The phase speed for the first mode is calculated at 2.96 m s$$^{-1}$$ - 1 , which compares well with that estimated by tide gauge observations.

A new fossil cricetid (Rodentia, Sigmodontinae) from northeastern Brazil with remarks on small mammal extinctions in the tropical Quaternary

2020 ◽  
Vol 101 (4) ◽  
pp. 1133-1147
Author(s):  
Simone B das Neves ◽  
Ulyses F J Pardiñas ◽  
Patrícia Hadler ◽  
Elver L Mayer ◽  
Ana M Ribeiro
Keyword(s):  
New Species ◽  
South America ◽  
Small Mammal ◽  
Late Quaternary ◽  
Northeastern Brazil ◽  
The South ◽  
Quaternary Deposits ◽  
Extant Species ◽  
Genetic Features ◽  
History Of

Abstract The rare cricetid rodent Bibimys Massoia, 1980 contains three extant species that are distributed in the lowlands of eastern South America between 35°S and 20°S and distinguished mostly by subtle morphological and genetic features. Several fragmented jaws belonging to this genus were recovered from Late Quaternary deposits located in northeastern Brazil, forming part of a rich archaeological and paleontological small mammal assemblage that has been recovered from caves in the Serra da Capivara, state of Piauí. This material is described herein as belonging to a new species, the most hypsodont member of the genus. The specimens also represent an extralimital occurrence of this sigmodontine, as the nearest extant population of Bibimys is ~1,200 km to the south. Because there are few reliable records of extinct small mammals from the Pleistocene–Holocene transition on the South American continent, in describing this new sigmodontine we extend the records of past biodiversity preserved in the Quaternary deposits of tropical South America. This new species likewise highlights that the Serra da Capivara deposits are promising for understanding the evolutionary history of cricetid rodents.

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