Pliocene—pleistocene boundary in the Kleszczów Graben at Belchatów, central Poland
作者:
D. Krzyszkowski,
A. Szuchnik,
期刊:
Journal of Quaternary Science
(WILEY Available online 1995)
卷期:
Volume 10,
issue 1
页码: 45-58
ISSN:0267-8179
年代: 1995
DOI:10.1002/jqs.3390100106
出版商: John Wiley&Sons, Ltd
关键词: Tertiary/Quaternary boundary;pollen analysis;sedimentary environments
数据来源: WILEY
摘要:
AbstractThe Pliocene‐Pleistocene boundary, defined using pollen analysis, has been recorded in sections at the Belchatów outcrop, Kleszczów Graben, central Poland. The boundary is located at the top of the green clay subunit of the Tertiary Clayey‐sandy unit. A pollen flora of Reuverian C type, dominated by pine, 10–20% of ‘Reuverian elements’ and scarce thermophilous Tertiary trees, was found directly below this subunit. Cold stage floras of Praetiglian type were, in turn, recorded in the Łekińsko Formation, lying directly on the green clays. The Pliocene—Pleistocene transition at Belchatów demonstrates the characteristic features of this boundary in western Europe, that is, the disappearance of Tertiary thermophilous tree pollen taxa, followed by a cooling to open‐forest or forest‐steppe conditions. Both pollen analysis and geological data suggest continuous sedimentation at least from the Upper Pliocene to the Prae‐Tiglian, with no change of sediment sources and no marked hiatuses. The fluvial deposits of the Praetiglian Łekińsko Formation, although Pleistocene in age, mark a final period in the Tertiary evolution of the Kleszczów Graben. Later, there is a hiatus to the deposition of the first glacigenic sediments in the region
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