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The Callovian to Volgian section in the Tyumenskaya superdeep well SDW-6 is very important for the development and improvement of Jurassic biostratigraphy in West Siberia. It was drilled with almost continuous recovery of core (about 200 m), which is characterized by rich assemblages of microfossils. In this paper the results of micropalaeonto-logical and palynological studies of the most complete Jurassic succession in the north of West Siberia are discussed, taking into consideration the problems of bio- and lithostratig-raphy of the region.

The comprehensive analysis of the stratigraphical distribution of the different micro-fossil groups (foraminifers, microforaminifers, ostracods, dinoflagellate cysts, acritarchs, prasinophytes, spores and pollen) allows the creation of a detailed zonation. For the first time, an almost continuous sequence of dinoflagellate cyst zones for the Callovian-Middle Volgian has been established in the north of West Siberia, providing the basis for development of the Jurassic dinoflagellate cystzonation in West Siberia.

Distinctive features of microbenthos communities and microphytoplankton associations reflecting biofacies have been studied. The pattern of distribution of microbenthic communities and microphytoplankton associations, depending on changes of transgressive-regressive events and palaeoenvironments in the Callovian to Volgian, has been established.

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