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首页> 外文期刊>Geological Society of America Bulletin >Late Quaternary landscape evolution and bioclimatic change in the central Great Plains, USA
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Late Quaternary landscape evolution and bioclimatic change in the central Great Plains, USA

机译:美国中央大平原的晚期四季景观进化与生物恐星变化

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摘要

A systematic study of floodplains, terraces, and alluvial fans in the Republican River valley of south-central Nebraska provided a well-dated, detailed reconstruction of late Quaternary landscape evolution and resolved outstanding issues related to previously proposed Holocene terrace sequences. Stable carbon isotope (delta C-13) values determined on soil organic matter from buried soils in alluvial landforms were used to reconstruct the structure of vegetation communities and provided a means to investigate the relationships between bioclimatic change and fluvial activity for the period of record. Our study serves as a model for geomorphological and geoarcheological investigations in stream valleys throughout the central Great Plains and wherever loess-derived late Quaternary alluvial fans occur, in particular.
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