Black sads of the Yaroshivka Beds (Middle Eocene, Lutetian) that directly overlie granitoids exploited in the Yaroshivka Quarry (northeastern peripheries of the Ukrainian Shield) have been studied for palynology. This study was conducted with an aim of palaeoenvironment reconstruction that could contribute to the palaeogeography of Ukraine in the Palaeogene. Deposits studied yielded both marine and continental palynomorphs. The former consist mainly of dinoflagellate cysts, Prasinophyceae algae, and acritarchs. Terrestrial palynomorphs are mainly bisaccate pollen grains. Representatives of both palynomorph groups are immature but they show high degree of mechanical damage. Particularly large specimens of chorate dinoflagellate cysts are almost exclusively preserved as torn-off fragments. Small proximate dinoflagellate cysts and tiny acritarchs are usually complete. Palynomorph assemblages described were interpreted as typical for marine, high energetic sedimentary setting located within a proximal zone of terrestrial influences. Subsequent progression of the Eocene transgression led to a complete inundation of the Ukrainian Shield in the area of our study. As a result, different palaeoenvironmental conditions appeared. They caused pronounced changes in palynofacies and palynomorphs assemblages found in the strata transitional to the overlying Kyiv Fm.

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