Palynological and microfacies analysis of the Famennian part of the Russkiy Brod Quarry section, Central Devonian Field, Russia

Palynological investigations of samples from the Upper Devonian of the Russkiy Brod Quarry section (Zadonsk Horizon, Central Devonian Field, Russia) revealed the presence of the CZ (Cyrtospora cristifera-Diaphanospora zadonica) miospore Zone, in particular its upper part, the Za (Convolutispora zadonica) Subzone. This discovery indicates one of the lowest part of the Famennian (crepida conodont Zone). Palynofacies and microfacies analysis confirmed that deposition occurred in a shallow, marginal-marine environment. The good state of preservation of the palynomorphs enabled the recognition of additional internal exine layers in the structure of Tergobulasporites immensus and Crumenasporites monosaccus megaspore species.