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Abstract

Due to the long sedimentation period (about 70 000 y.) and the unique quality of the lake deposits represented by very long, monotonous layers of lacustrine chalk, the sequence at Ossówka is exceptional. We conducted highly-resolved pollen and isotope analysis of the 27-m-long, upper part of the sequence of the lake sediments covering the final stage of the Holsteinian and the early phases of the Saalian Complex (Marine Isotope Stages (MIS) 11–10). In the pollen profile three main forest interstadials (L PAZ O-3, O-5, O-7) and the intervening steppe – tundra stadials (L PAZ O-2, O-4, O-6, O-8) as well as numerous units of lower rank were identified. Interstadials were characterized mainly by the presence of well-established pine forest. Stadials in turn, represented steppe – tundra vegetation with very pronounced continental influences. Also, three clearly established phases of forest fires starting at the beginning of interstadials and gradually disappearing are interesting feature of the sequence. Fires of that scale are very rarely noted in the palynological spectra. The examined sequence is characterized by the high dynamics of changes in the post interglacial part of the profile. It provides, coupled with clear features of the Holsteinian succession and its duration, a reliable correlation with other terrestrial and marine archives.
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Authors and Affiliations

Krzysztof Bińka
1
Marcin Szymanek
1
Jerzy Nitychoruk
2

  1. University of Warsaw, Faculty of Geology, Żwirki i Wigury 93, 02-089 Warszawa, Poland
  2. John Paul II University of Applied Sciences in Biała Podlaska, Sidorska 95/97, 21-500 Biała Podlaska
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Abstract

Eleven species of cumaceans were found in 105 samples collected in Admiralty Bay (King George Island) in the summers of 1984/85 and 1985/86, from 20 to 500 m depth range. Four cumacean assemblages were distinguished using the multivariate analysis. They were characterized by the dominance of one or two species often with low density values. Two assemblages were found in open waters of Admiralty Bay. The first inhabited on sandy−clay−silt and silty−clay−sand bottom deposits in the depth range from 140 to 330 m, with Campylaspis maculata (1.6 ± 2.1 ind./0.1m 2 ; F = 72.4%) and Leucon sp. (1.4 ± 1.6 ind./0.1m 2 ; F = 68.9%) as key species. The second assemblage was found in the depth range from 50 to 120 m with silty−sand sediments, and it was characterized by the presence of Vauthompsonia inermis (6.5 ± 6.6 ind./0.1m 2 ; F = 92.0%). A third assemblage was found in shallow waters influenced by glaciers in the bottom area of Ezcurra Inlet. It was characterized by sandy−clay−silt sediments and the presence of Eudorella splendida (14.6 ± 9.4 ind./0.1m 2 ; F = 100.0%) as a core species. The last assemblage was found in the shallow sublittoral (50–100 m) of Ezcurra Inlet and the central basin, with Diastylis anderssoni armata (1.5 ± 1.1 ind./0.1m 2 ; F = 85.7%) and Diastylopsis goekei (1.1 ± 1.0 ind./0.1m 2 ; F = 71.4%) as the most frequent and abundant species. V. inermis is considered a eurytopic species with high frequency in the whole material, and was present in all four distinguished assemblages. E. splendida and D. goekei were also recorded in each of the assemblages, but their total frequency was lower.
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Authors and Affiliations

Krzysztof Pabis
Magdalena Błażewicz-Paszkowycz

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