Temat: Early Permian - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Palaeomagnetism of Permian through Early Triassic sequences in central Spitsbergen: contribution to magnetostratigraphy
Autorzy:: Nawrocki, J.
Grabowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/2059421.pdf
Data publikacji:: 2000
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Spitsbergen
Permian-Early
Triassic
magnetostratigraphy
correlation
Opis:: A total of 297 samples for palaeomagnetic studies were collected from Upper Gzhelian through Spathian sediments of the Isfjorden area (central Spitsbergen). In spite of extensive Cenozoic remagnetisation the studied rocks yielded palaeomagnetic poles and magnetostratigraphy. Almost all Permian samples were reversely magnetised during Kiaman superchron. Normal-polarity samples appear in the Ufimian and Kazanian sediments. The topmost samples from the Kapp Starostin Formation (Upper Permian) contain reverse polarity. The magnetic polarity record noted in the Early Triassic (Griesbachian-Spathian) sequences is fully convergent with magnetic polarity schemes obtained in the Canadian Arctic and Deltadalen type section.
Źródło:: Geological Quarterly; 2000, 44, 2; 109-117
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Tytuł:: A new Early Triassic gastropod genus and the recovery of gastropods from the Permian-Triassic extinction
Autorzy:: Nutzel, A
Powiązania:: https://bibliotekanauki.pl/articles/22642.pdf
Data publikacji:: 2005
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: gastropod
Werfenella
Alps Mountains
Purpurinidae
Werfen Formation
Olenekian
new genus
mass extinction
Early Triassic
Triassic
Gastropoda
Permian
Turbo rectecostatus
paleontology
Opis:: The common Early Triassic (Olenekian) gastropod Turbo rectecostatus from the upper Werfen Formation of the Alps is placed in the new genus Werfenella. Elimination of the wrong or outdated generic assignments of Late Palaeozoic and Early Mesozoic gastropods to archetypical genera such as Turbo, Trochus, or Natica (all with Recent type species) represents an important step toward understanding the evolutionary history of the gastropods across the Permian/Triassic mass−extinction event. The first appearance of Werfenella in the Olenekian, as well as the origination of other groups of gastropods, suggests an early turnover in the aftermath of the end−Permian mass extinction event. The relatively large size of Werfenella (up to 35 mm) sheds doubt on assertions that all Early Triassic gastropods are microgastropods (Lilliput effect). The new genus is placed in the caenogastropod family Purpurinidae and represents its earliest occurrence. However, a placement of Werfenella in the Archaeogastropoda (Vetigastropoda) is also possible because it resembles the paraturbinid genus Chartronella. The characteristic Werfenella rectecostata–Natiria costata gastropod association from the Werfen Formation is not found in the approximately contemporaneous Sinbad Limestone of the Moenkopi Formation (Utah, USA) nor elsewhere outside Europe. This suggests that the similarities between Olenekian gastropod faunas from the Tethys and western North America are more limited than previously thought.
Źródło:: Acta Palaeontologica Polonica; 2005, 50, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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