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Sketch map of the distribution of the Sub-Liguride Units (including Aveto-Petrignacola Formation) in the northern Apennines with indication of the sampling sites (modified from [2]). Legend: 1 = Alpine thrust belt units; 2 = Northern Apennines units; 3 = Sub-Liguride Units; 4 = thrusts; 5 = faults.
