Die Ostsahara im Spätquartär: Ökosystemwandel im größten by Hans-Joachim Pachur

By Hans-Joachim Pachur

Die Ostsahara ist der gr??te hyperaride Raum der Erde. Die Forschungen zeigen, dass in den letzten ca. 13.000 Jahren ein geradezu dramatischer Klimawandel abgelaufen ist. Die Rekonstruktion der ostsaharischen Geo?kosysteme auf der foundation von geomorphologisch-pal?ohydrographischen, sedimentologischen und pal?ozoologischen Befunden f?hrt zu ?berraschenden Ergebnissen. Beispielsweise erweisen sich einige schwer zug?ngliche Syneklisen der Ostsahara w?hrend der fr?h- bis mittelholoz?nen Feuchtphase als bedeutende Wasserdampfquellen. Die Existenz von fischreichen S??wasserseen und ausgedehnten S?mpfen im Inneren des Kontinents f?hrte zu einem r?ckgekoppelten procedure mit niederschlagsausl?sendem Effekt und Grundwasserbildung. Pal?odrainagesysteme hoben den endorheischen prestige auf; sie bildeten Migrationsbahnen f?r ?thiopide Gro?s?uger und neolithische Ethnien. Der Widerspruch zwischen der heutigen Aridit?t und der Tatsache eines Grundwasserexports aus den gro?en Becken der Ostsahara an die nordafrikanische K?ste wird vor dem Hintergrund der geologischen und pal?oklimatischen Entwicklung diskutiert.

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Additional info for Die Ostsahara im Spätquartär: Ökosystemwandel im größten hyperariden Raum der Erde

Sample text

Neptuni as aberrant spicules, and receptaculitids not as lyssacines, but as related calcareous sponges. Miiller (1958) considered receptaculitids to have been sponges of uncertain taxonomic position. In 1967 he believed that their taxonomic relationship to other groups of organisms is difficult to demonstrate; however, he accepted that they share similarities with archaeocyathids. In his major (1968) paper, he erected a new [sic] order, Receptaculitida, for the two families Receptaculitidae Eichwald and Ischaditidae n.

The fIrst of the specimens described above is covered with little projections arranged in regular lines that revolve and intersect, and with a crust that seems no thicker than a sheet of paper. The outer surface of the second bears rhomboidal protuberances arranged in a good imitation of a pine cone. On a large part of the third, beside the summit, are round holes, rather shallow, of one line [line = 1/ 12 inch] in diameter, arranged in curved ranks that intersect, like those of the seeds of a sunflower, in their receptacle.

With this we agree, but receptaculitids, as believed by Giimbel, may have been composed of aragonite that was later replaced by coarse calcite. Still, Hinde's argument that no original structures have been found isprimafacie grounds for exploring whether "some other mineral than calcite" was the original mineral of the skeleton (Hinde 1884:804). Hinde's arguments are as follows: (1) The skeleton may have been entirely dissolved, leaving only hollow molds. 6. Redrawn figures of Giimbel's and Rauffs meroms of Devonian Receptaculites.

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