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RUSAVA-2, A NEW LOCALITY OF MID-PLEISTOCENE FAUNA AND PALYNOFLORA IN UKRAINE: GEOLOGY, PALAEONTOLOGY, PALAEOGEOGRAPHY AND RELATIVE GEOCHRONOLOGY

RUSAVA-2, A NEW LOCALITY OF MID-PLEISTOCENE FAUNA AND PALYNOFLORA IN UKRAINE: GEOLOGY, PALAEONTOLOGY, PALAEOGEOGRAPHY AND RELATIVE GEOCHRONOLOGY

Abstract

This paper reports the results of field geological studies of Rusava-2 section recently discovered in Vinnytsia Region and an examination of the fossil fauna and palynoflora from the locality to provide a deeper and integrated characterisation of the Pleistocene deposits of the Middle Dniester area of Ukraine. Ten taxa of mammals were identified in the alluvial series of the terrace: Equus (Equus) mosbachensis, Bison sp., Cervus sp., Vulpes cf. vulpes, Ochotona ex gr. pusilla, Prolagurus cf. posterius, Arvicola mosbachensis, Mimomys sp., Microtus sp., Allocricetus bursae. The invertebrate fossils represent the ostracod Pseudocandona compressa, 11 species and subspecies of Pleistocene freshwater molluscs, and also include redeposited gastropod shells of the Sarmatian age. A palaeogeographic reconstruction of the development of the terrace complex deposits was made and a relative geological age of the alluvial sediments of the terrace was estimated. The numbering of the Pleistocene terraces of Ukrainian rivers was discussed and the chronocorrelative terraces were proposed to be described as geological bodies with paleontological-chronostratigraphic characteristics. The conducted palynological analysis of the subaerial sediment cover of the terrace suggests a change in vegetation from the meadow-steppe type through coniferous-birch communities to coniferous forests with a small admixture of broadleaved trees. The biostratigraphic analysis indicates the correlation of the subaqueous sediments of the Rusava-2 section with the early Middle Neopleistocene deposits and with the above-floodplain Zavadivka-Dnieper terraces containing the fauna of the Babel therioassociation and flora of the Zavadivka thermochrone.

Вперше проведено польові дослідження геологічної будови розрізу Русава-2 та здійснено лабораторне вивчення палеонтологічних решток викопної фауни і палінофлори місцезнаходження. Це забезпечило поглиблену та різнобічну характеристику плейстоценових відкладів Середнього Придністров’я України. В алювіальній товщі тераси знайдено 10 таксонів ссавців – Equus (Equus) mosbachensis, Bison sp., Cervus sp., Vulpes cf. vulpes, Ochotona ex gr. pusilla, Prolagurus cf. posterius, Arvicola mosbachensis, Mimomys sp., Microtus sp., Allocricetus bursae. Крім того, визначено 11 видів і підвидів плейстоценових прісноводних молюсків та перевідкладені черепашки черевоногих молюсків сарматського віку. Остракоди представлено єдиним видом – Pseudocandona compressa. Проведено палеогеографічну реконструкцію умов формування відкладів терасового комплексу та обґрунтовано відносний геологічний вік алювіальних осадків тераси. Упорядковано нумерацію плейстоценових терас великих і малих річок України, запропоновано описувати тераси-хронокорелятиви в якості геологічного тіла (стратогена, кліматоритму) з палеонтолого-хроностратиграфічною характеристикою. Проведений спорово-пилковий аналіз субаеральної надбудови тераси вказує на зміну рослинності від лучно-степового типу через хвойно-березові угруповання до хвойних лісів з невеликою домішкою широколистяних. Результати біостратиграфічних досліджень свідчать про кореляцію субаквальних осадків розрізу Русава-2 з відкладами початку середнього неоплейстоцену та надзаплавними завадівсько-дніпровськими терасами (стратогенами) з фауною бабельської теріоасоціації та флорою завадівського термохрону.

Keywords

Pleistocene, river terraces, Middle Dniester area, relative geological age, плейстоцен, біостратиграфія, відносний геологічний вік, річкові тераси, biostratigraphy, Середнє Придністров’я

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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