Disperse megaspores in the Lower Visean deposits of the Kaluga oblast (1P/A Aleksandrovskaya borehole) |
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Authors: | O. A. Orlova D. A. Mamontov A. L. Kholopova |
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Affiliation: | 1. Faculty of Geology, Moscow State University, Moscow, Russia
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Abstract: | Disperse megaspores were first found in the Lower Visean deposits of the Kaluga region (1P/A borehole). A layered distribution of the megaspores in the studied section is shown. A large number of megaspores were established in the lower part of the section of the Bobrikovskian deposits. Higher along the section, there is a trend to a decrease in the number of megaspores until they disappear completely in the Tula deposits. Two megaspore assemblages were identified. A great variety of species was observed in the lower assemblage; the dominant megaspores are Zonalesporites brasserti and Aphanozonatisporites triglobatus. The only dominant species was recorded in the upper assemblage, Zonalesporites brasserti, with a low species diversity of the entire assemblage. The miospore and megaspore assemblages that are typical of the Lower Visean in the section of the analyzed borehole are compared. |
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