Signification des paléomilieux and évolution du climat au maghreb. Le maroc oriental au pléistocène récent

Abstract

After the discovery of new prehistoric and geological sites in eastern Morocco, multidisciplinary studies were made on a regional scale about prehistoric cultures, sediments, grains charcoal, spores and pollen, fauna and chronology. They allowed to treat the following topics: the evolution of flora and climates during the Rharblan (= Holocene) and Soltanlan (= WUrm) periods, l.e. about one hundred thousand years, according to altitude and latitude; the palaeoenvironmental meaning of glacisalluvial terrace systems, calcrandes and sheltered deposits. The palaeoflora are the same as actually and only the vegandation boundaries fluctuate. These variations decrease from North to the South. The Soltanlan Is a dry period with three humid Interstages during which the bioclimate is semiarid to subhumid. The Rharbian is principally humid with three short arid periods. The glacisterrace systems are built during the aridhumid transition and also during the humid interstadial period like the calcrandes at the top of the soltanian formations. The sheltered deposits have recorded both arid and humid stages. © 1992 Taylor & Francis Group, LLC.