| mhorn | Дата: Friday, 15.03.2013, 18:26 | Сообщение # 1 |
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| Bragin V.Yu., Dzyuba O.S., Kazansky A.Yu., Shurygin B.N. (2013) New data on the magnetostratigraphy of the Jurassic–Cretaceous boundary interval, Nordvik Peninsula (northern East Siberia) // Russian Geology and Geophysics, Vol. 54, P.335–348.
pdf: http://cretaceous.ru/files/pub/temp/bragin_et_al2013en_j-k.pdf
The results of this study were used to identify a reversed polarity magnetozone, referred to as M17r, in Berriasian sections of the Nordvik
Peninsula (northern East Siberia) within the normal polarity magnetozone (M18n) from previous studies. The new magnetozone embraces the Volgian–Ryazanian boundary (Chetaites chetae/C. sibiricus zonal boundary). It was also found that the former magnetozone M17r at Nordvik,
which includes the C. sibiricus/Hectoroceras kochi zonal boundary should correspond to magnetozone M16r. Using magnetostratigraphic and
biostratigraphic criteria proves that the Boreal C. sibiricus Zone is correlated with at least the major part of the Tethyan Tirnovella occitanica
Zone, and the Boreal H. kochi Zone is correlated with the lower part of the Malbosiceras paramimounum Subzone of the Tethyan Fauriella
boissieri Zone.
Middle Jurassic - Lower Cretaceous ammonites & aptychi
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