| mhorn | Дата: Tuesday, 20.04.2010, 20:12 | Сообщение # 1 |
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| Rogov M. A. and Price G. G. (2010) New stratigraphic and isotope data on the Kimmeridgian–Volgian boundary beds of the Subpolar Urals, Western Siberia // Geol. Quart., 54 (1): 33–40.
pdf: http://www.pgi.gov.pl/images/stories/G_Q/54_1/rogov.pdf
A review and new data regarding the ammonite faunas and biostratigraphy of the uppermost Kimmeridgian–lowermost Volgian of the Subpolar Urals are presented. The combined ranges of al most all ammonite genera in the lowermost Volgian of the Subpolar Urals supports the traditional point of view regarding the equivalence of the Magnum Zone with the two lowermost Bolonian Zones and with the bulk of the Klimovi Zone. This stratigraphic interpretation permits the stable isotope data (carbon and oxygen) derived from associated belemnites to be presented in context. The isotopic records from the belemnites suggest that the lower Volgian sediments of the Yatria River, Subpolar Ural Mountains were deposited in a warm marine environment consistent with a warm high latitude scenario. If reduced salinites are invoked apparent temperatures are lowered by ~5°C, but still remain well above freezing and are relatively warm compared to some recent modelled estimates of Late Jurassic ocean temperatures
Middle Jurassic - Lower Cretaceous ammonites & aptychi
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