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Jurassic Forum » JURASSIC references & paper reviews » Jurassic of Russia and former USSR » Markevich V.S., Bugdaeva Ye. V. (2009) (J/K boundary in the Bureya basin (Russian Far East))
Markevich V.S., Bugdaeva Ye. V. (2009)
mhornДата: Friday, 31.07.2009, 21:48 | Сообщение # 1
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Markevich V.S., Bugdaeva Ye. V. (2009) Pollen analysis basis for the age of the boundary (Jurassic-Cretaceous) deposits in the Bureya basin (Russian Far East) // Geol. Pac. Ocean. Vol.28. no.3. P.91-100. [in Russian]

Pdf: http://rogov.zwz.ru/Markevich,%20Bugdaeva,2009_JKFarEast.pdf

Pollen assemblages in the coal-bearing deposits of the Talyndzhan and the Dublikan Formation, Bureya basin, were studied The pollen assemblages from the upper part of the Talyndzhan Formation are dominated by gymnosperms, mainly those close to Pinaceae, and also Ginkgocycadophytus. Ferns are in small amounts; however, their taxonomical diversity is rather high. The last appearance of the spores Staplinisporites pocockii, Camptotriletes cerebriformis, C. nitida, and Cingulatisporites sanguinolentus, typical of Late Jurassic pollen floras, is noted. Ferns prevail in the pollen assemblage of the Dublikan Formation. They are chiefly represented by Cyathidites and Duplexisporites. Among gymnosperms the role of Classopollis along with conifers rises. The first appearance of Stereisporites bujargiensis, Neoraistrickia rotundiformis, Contignisporites dorsostriatus, Duplexisporites pseudotuberculatus, D. rotundatus, Appendicisporites tricostatus, and Concavissimisporites asper is observed. These spore forms are characteristic of Berriassian pollen floras. Thus, the boundary between the Jurassic and the Cretaceous most probably runs between the Talyndzhan and the Dublikan Formation (or, more precisely, such position of J/K boundary is more suitable for purposes of regioonal stratigraphy).


Middle Jurassic - Lower Cretaceous ammonites & aptychi
 
Jurassic Forum » JURASSIC references & paper reviews » Jurassic of Russia and former USSR » Markevich V.S., Bugdaeva Ye. V. (2009) (J/K boundary in the Bureya basin (Russian Far East))
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