Both the Apennine and Dinaric systems are eugeosyncline-miogeosyncline couples. The eugeosynclines are internal and contain ophiolites and early Flysch deposits; they were involved in orogenesis as early as the Cretaceous and were often overthrust outward. The miogeosynclines are external and contain no ophiolites. Their Flysch deposits are younger (late upper Cretaceous-Eocene), were involved later in orogenesis, and remained autochthonous. The Italo-Dinaric system is centripetal with respect to the Apulian fold structure. As a whole, it has moved longitudinally toward the northwest; Italo-Dinaric zones are found on the flanks of the east Alps (southern Alps) where they exhibit periclinal "closure."