Lithospheric bulges at regional unconformities: the case of Mesozoic-Tertiary Apulia

Cyclic shallow-water carbonate sequences in the Cretaceous of Southern Italy are punctuated by regional unconformitiesassociated with bauxites and palaeokarst features. Direct and indirect evidence strongly suggests that, despite their apparentplate interior position, tectonics rather than eustasy was responsible for subaerial exposure, long enough to form bauxites.In-plane stress-related lithospheric arching caused by erogenic deformation along the distant active margins of Apulia isinvoked to explain the vertical stacking of a series of regional unconformities (one of them marked by bauxites) on land andunder the sea. The case history of Apulian bauxites associated with a Turonian arching allows a first estimate of the durationof a stress-related 'distant' perturbation of a subsiding passive continental margin.