Abstract
New field and biostratigraphic data have allowed a different reconstruction of the Ligurian Val Marecchia Nappe, over-riding the Umbro-Marchean external units in the north-eastern Apennines. The nappe's stratigraphic succession is made up of two different variegated clay formations, characterized by peculiar lithologies and ages, and separated by carbonatic turbidites, 700 m thick. The lower clayey formation ranges in age between Cretaceous and at least Lower Ypresian, whereas the Upper one has to be regarded as not older than Lower Oligocene. Such a succession, very similar to the one characterizing the Sicilide Complex in the southern Apennines, would appear more in agreement with an origin of the Val Marecchia Nappe terrains from the Sub-Ligurian rather than from the Ligurian Domain.
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