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...]]'' in the north, ''[[Penninic nappes|Penninicum]]'' and ''[[Austroalpine nappes|Austroalpine system]]'' in the centre and south of the Periadriatic seam th ...]] and [[Miocene]] epochs. The pressure formed great recumbent folds, or ''nappes'', that rose out of what had become the [[Tethys Sea]] and pushed northward