Observations on the Late Quaternary of Jordan
Observations on the Late Quaternary of Jordan
复制标题
约旦晚第四纪观测
DOI：
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发表时间：
1964
期刊：
影响因子：
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通讯作者：
C. Vita
中科院分区：
文献类型：
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作者：
C. Vita
摘要 在利桑系列沉积和更新世约旦大湖消失之后，流入约旦裂谷的山谷受到侵蚀，随后主要泉水进入凝灰岩形成阶段。然后凝灰岩被侵蚀；分类不良的砾石和土壤的沉积物填满了山谷，并在山谷口形成了扇形。溪流切入这些沉积物形成了阶地。经过一段短暂的加积作用，随后发生至今仍然活跃的侵蚀作用，形成了一个较低的阶地。在上里桑地层和上部阶地中发现了旧石器时代晚期的文物。较低的阶地包含罗马陶器碎片。凝灰岩被认为代表了一个湿润的阶段，随后的阶地是一个活跃的机械风化阶段。较低的阶地可能是由于降雨情况的轻微变化造成的。
Abstract After the deposition of the Lisan Series and the disappearance of the great Pleistocene Jordan lake, erosion in the valleys draining into the Jordan Rift Valley was followed by a phase of tufa formation by the major springs. The tufas were then eroded; and the deposition of poorly-sorted gravel and soil filled the valleys and formed fans at their mouths.Stream downcutting into these deposits resulted in a terrace. A briefer period of aggradation, followed by erosion which is still active today, formed a lower terrace.Upper Palaeolithic artefacts have been found in the upper Lisan beds and in the upper terrace. The lower terrace contains Roman potsherds.The tufas are thought to represent a wetter phase, and the succeeding terrace a period of active mechanical weathering. The lower terrace probably resulted from a slight change in the rainfall regime.