History 1

A History of Land Use in Arid Regions by L. Dudley (Editor) Stamp

By L. Dudley (Editor) Stamp

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C. climatic conditions began to improve again. Although there is no evidence of precipitation in the Sahara itsel€, Ethiopia must have enjoyed a m a x i m u m rainfall about 2,000 years ago in order to account for the greater Nile volume and load. C. -there are 13 records of exceptionally high floods. C. D. ,1 m. higher than it. has been since. This seems to explain why 2 m. C. D. 300-implying a rate of deposition twice as Climatic change in arid regions since tho Pliocene great as during the past century [29, 301.

C. D. ,1 m. higher than it. has been since. This seems to explain why 2 m. C. D. 300-implying a rate of deposition twice as Climatic change in arid regions since tho Pliocene great as during the past century [29, 301. The entire clune fields, once covering great parts of the valley between the F a y u m and Asyut, were dïowned in this surge of alluvial malerial. , Tanis). The Eahr Jusef, which n o w flows from the Nile at Dairut, probably began eilher at Asyut or Sohag and flowed right along the edge of the Western Desert.

P L U V I O - G L A C I A L C L I M A T E S IN T H E A M E R I C A S A s was the case with the Old World arid zone,the glacial phases of the Pleistocene were associated with greater moisture and lower temperatures in the dry lands of North and South America. T w o great mountain ranges run more or less north-souththrough the American South-west and northern Mexico, so that almost everywhere the latitudinal shifts of the temperature zones were quite appreciable. Throughout the area in question the mountain glaciers advanced quite considerably or n e w cirque glaciers were created in response to a temperature lowering of the order of at least 3" C.

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