Morphological redescription of miospore marker of Givetian deposits of the Central Devonian field

Abstract

Introduction: when conducting comprehensive biostratigraphic studies of Devonian deposits on the territory of the Central Devonian field, the emphasis is on expanding and detailing core studies to determine the boundaries of stratigraphic units. Compliance with strict morphological rules when classifying taxa became the basis for re-describing and renaming some species of Paleozoic miospores, previously identified according to the classification of S. N. Naumova. Re-description of species allows updating the taxonomy of dispersed miospores and increases the validity of biostratigraphic conclusions.

Methodology: core material from wells of the Central Devonian field was studied. The total number of samples studied − 69.

Results and discussion: the results make it possible to clarify the taxonomy of dispersed miospores and increase the validity of palynostratigraphic studies. The data obtained can be used to create new generation maps, to correlate local stratigraphic schemes with regional schemes of Givetian deposits of the East European platform, as well as to detail and expand the palynological classification, which is important for reconstructing the geological history of the region.

Conclusions: as a result of palynological studies, a new description of the miospore marker Rimosisporis ocularis was presented, taking into account its morphological characteristics according to the current nomenclature. In the middle part of the zone (EX) in the subzone (CV), this taxon appears and marks this stratigraphic interval.