Abstract

Large slabs of essentially undeformed exotic sedimentary rocks, some inverted stratigraphically, occur randomly in the chaotic scaglia terranes of the Apennines. The Monghidoro inverted slab in Tuscany, fifteen kilometers in length and width and more than one kilometer thick, comprises late Cretaceous to Eocene? Monghidoro group clastics. The slab is perched upon the chaotic scaglia, and is overlain by Oligocene to Miocene Loiano molasse in normal sequence with a basal conglomerate containing detritus derived from the Monghidoro group and the scaglia. The slabs probably originated as parts of early Tertiary (late Eocene?) recumbent folds eroded to considerable depth prior to deposition of the Loiano molasse, then fragmented during the Miocene to Pliocene large-scale landslipping. The slabs originally in the lower limbs of the recumbent folds now exhibit inverted stratigraphic sequences. Those in the upper limbs now have normal sequences.

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