In the hyperarid eastern Sahara, west of the Nile River in Egypt, areas with vegetated eolian mounds have attracted people and animals because of shallow groundwater that at times of high water tables may be reached by hand digging shallow wells. An eolian phreatophytic mound with a living arak bush (Silvadora persica L.) on top, one of three known from this region of SW Egypt, provided a stratigraphic record of its growth. The geochronology of the mounds aggradation and that of a nearby tarfa mound (Tamarix nilatica Bunge) was determined by radiocarbon dating plant macrofossils within the stratigraphic succession. Eolian aggradation of the mound postdates deflation that eroded playa sediments of the Neolithic pluvial that ended ca. 5000 BP and appears to be due to a resurgence of the shallow aquifer. Subsequent deflation of the mounds is apparently due to post-1500 BP aridity. Regional vegetation is described in the Appendix I.

在埃及尼罗河以西的极度干旱的撒哈拉东部地区，植被覆盖的风成丘地区吸引了人类和动物，因为地下水位较浅，在地下水位高的时候，用手挖浅井就可以到达。一个风积水生土丘的顶部有活的阿拉克灌木（Silvadora persica L.），这是埃及西南部地区已知的三个土丘之一，提供了其生长的地层记录。土丘加积和附近塔法土丘（Tamarix nilatica Bunge）的地质年代学是通过对地层序列内的植物大型化石进行放射性碳测年来确定的。土丘的风积作用发生在通货紧缩之后，通货紧缩侵蚀了新石器时代洪流的普拉亚沉积物，大约结束了。 5000 BP，似乎是由于浅层含水层的复苏。随后土丘的收缩显然是由于 1500 年后的干旱造成的。区域植被描述见附录一。