Untersuchungen an Grundwässern der Ost-Sahara

In a joint enterprise, mostly Eastern Sahara artesian waters have been investigated. Age determinations and geochemistry allow geological conclusions. The rains responsible for the waters probably fell in a Pluvial about 25–35000 years ago. Their infiltration took place (simultaneously with or shortly after the lowest Wurm-level of the Mediterranean) mainly in Nubian sandstone regions and within Oasis-depressions of Western Egypt. The upper levels of the geological reservoir seem to have been leaked out during the eustatic lowering of the Mediterranean level via an overdeepened Nile-bed. Infiltration trapped air within the pore-space of Nubian sandstone. This air re-appears to-day — after having lost its Oxygene etc.-content — as Nitrogene-gas.Munnich andVogel describe („Untersuchungen an pluvialen Wassern etc.“) detailed investigations concerning the absolute age of these (and generally such) waters. E. T.Degens, in his part „Geochemische Untersuchungen etc.“, deals with the geochemistry of the occurrences, mainly with some stable isotopes.