Datation de deux niveaux marins sur la côte du Haut Atlas atlantique à 275 000 ans et à 120 000 ans.

A statistical study of 238U and 234U/238U distributions in coral samples from the Egyptian shoreline of the north-western Red Sea and in fossil mollusk shells from the Atlantic coast of High Atlas in Morocco: Implications for 230Th/234U dating

“…Deposits at these positions were recognized by some authors [39][40][41][42] at the Atlantic coast as Harounian sea level which correspond to 7 and/or 9 climatic stages. The average of ages reported previously for this level is about 260 ka [12,23,39,41]. 32 samples were analyzed but only 27 234 U/ 238 U activity ratios and 21 ages could be calculated.…”

“…The studied area is known by its geological importance and its fossil mollusc shells wealth and diversity. Several geological sections on the Coast of High Atlas at the Nord of Agadir City have been previously described [12,23,[39][40][41][42]. Some of our radiochemical results have been used by Choukri et al [31] to prove the rejuvenation of the mollusk shell ages before developing two models to establish relationships between the real and apparent ages related to the U post-incorporation mode.…”

“…In the Western Mediterranean Basin, following an early study by Stearns and Thurber [16] in Morocco, a large body of U-series data, derived from several species of mollusk, has accumulated as a result of work by Bernat et al [17], Goy et al [18], HillaireMarcel et al [19,20], Causse et al [21], Hearty et al [22], El Gharbaoui et al [23] and Choukri [12].…”