Intra-messinian gypsum palaeokarst in the Northern Apennines and its palaeogeographic implications.

A short intra-Messinian continental period has been recognised in some North Italian gypsum areas, mostly under the form of palaeokarst deposits. This emersion appears to have occurred only locally, and is explained as caused by the intra-Messinian tectonic phase and a major sea level lowering. Evidences of this palaeokarst are mostly small, although at some places the palaeontological content of its fillings is of great importance. The discovery near Zola Predosa (Bologna) of a new intra-Messinian extensive karst system and of its infilling sheds new light on the importance of this karst episode. [ABSTRACT FROM AUTHOR]