The metamorphism is diachronous and has been dated radiometrically in the eastern North Pyrenean Zone as Albian, whereas in the Basque country in the west ( for example in the Basque Marble Nappe ) it has been dated only as Campanian.
12.
The lower Miocene age conglomerates, sandstones and marls of the Nukhul Formation were deposited in shallow marine conditions as the sea began to flood the developing rift . The Nukhul Formation overlies the Abu Zenima Formation in some place but elsewhere is probably age equivalent, reflecting a diachronous change to marine conditions within the rift.
13.
Using the concept of deposition in both shallow and deep basins during the Messinian ( i . e . assuming that both Basin types existed during this period ), two major groupings are evident : one that favours a synchronous deposition ( image c ) of the first evaporites in all the basins before the major phase of erosion ( Krijgsman et al ., 1999 ); and the other that favours a diachronous deposition ( image a ) of the evaporites through more than one phases of desiccation which would first have affected the marginal basins and later the central basins ( Clauzon et al ., 1996 ).
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