The late Norian-Hettangian stratigraphic and paleogeographic evolution of the Bergamasc Alps

The field trip allows the observation and reconstruction of the stratigraphic and paleogeographic evolution during the Late Triassic-Early Jurassic time interval of a thick carbonate to mixed marly-carbonate succession developed on the western Sudalpine passive margin of Lombardy (Southern Alps, North Italy). The itinerary begins with the regional climatic and paleogeographic changes recorded in the upper Norian Dolomia Principale (retrogradation/demise of the carbonate factory also related to a major tectonic event) and continues into the Triassic/Jurassic boundary marked by a biologic-paleogeographic revolution and reorganization of the carbonate productivity from the Rhaetian to the Hettangian times. Several stops are dedicated to the observation of the lithofacies association and the cyclicity of the Rhaetian marly-carbonate succession deposited on different carbonate ramp depositional environments and characterized by several Transgressive -regressive trends.