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Insects and molluscs of the Late Pleistocene at the Gornovo site (Southern Ural foreland, Russia): New data on palaeoenvironment reconstructionsстатья
- Авторы: Dudko R.Yu, Danukalova G.A., Gurina A.A., Ivanov A.V., Mikhailov Yu E., Osipova E.M., Prosvirov A.S., Solodovnikov A.Yu, Legalov A.A., Zinovyev E.V.
- Журнал: Quaternary International
- Год издания: 2021
- Издательство: Pergamon Press Ltd.
- Местоположение издательства: United Kingdom
- DOI: 10.1016/j.quaint.2021.10.003
- Аннотация: The paper presents new data on the subfossil insects and molluscs, as well a new radiocarbon date for theGornovo site in the Southern Fore-Urals. As a result, the stratigraphic interpretation of the sediments of the lowerpart of the first above floodplain terrace of the Belaya River is corrected and they are assigned to the TabuldaHorizon (MIS 3) of the Upper Pleistocene in the regional scheme of the Fore-Urals Quaternary. The malacofaunaof the locality is represented by 27 species of terrestrial and freshwater molluscs. The composition of molluscs inthe deposits of MIS 3 indicates the succession of deposit accumulation in the river valley from the stage ofreservoirs that periodically connecting with the river to the stage of the overgrown oxbow lake. Single occurrenceof mollusc shells in the loams of MIS 2 is a result of sharp climate change. New insect material includes 136species of Coleoptera from 17 families, as well as Heteroptera and Hymenoptera representatives. 29 species ofbeetles (Carabidae, Histeridae, Scarabaeidae, Elateridae, Tenebrionidae, Chrysomelidae, Brentidae and Curculionidae)are recorded for the Pleistocene for the first time. The insect assemblages from Gornovo site areassigned to periglacial and humid boreal faunal types. The entomofauna of the periglacial type has no analoguesin the recent fauna; it corresponds to the deposits assigned to the middle of MIS 3. This entomofauna is characteristicto the MIS 2 and MIS 3 insect assemblages from the south of West Siberian Plain. Based on entomologicaldata, the climate of the middle of MIS 3 of the Southern Fore-Urals is reconstructed as dry and cold,extracontinental, with mean July temperature not exceeding +15 ◦C. Steppe landscapes likely prevailed in openareas and coniferous forests were restricted to river valleys. Beetles from deposits dated to end of MIS 3 areassigned to the fauna of the boreal humid type. These insect assemblages are significantly poorer in diversitythan periglacial type assemblages and are represented mainly by near water and forest Coleoptera. Based onthese species, meadow and forest landscapes were reconstructed. The reconstructed mean air temperature of Julyranged from +16 to +19 ◦C. This suggests a trend towards more mild conditions in the region connected to theclimate warming at the end of MIS 3. It is likely that humidification during this period was regional, determinedby the proximity of the site to the Southern Urals Mountains.
- Добавил в систему: Просвиров Александр Сергеевич