Abstract: A Framework for a Global Triassic Correlation: A Proposal

Piero Gianolla, Vittorio De Zanche, Paolo Mietto

The second-order peak transgressions are world-wide events, documented by the connection of basins (sometimes also with commixture of faunas) and by a strong increase in accommodation space. Throughout the Tethys and outside of it (e.g., Germanic basin, Pacific domain), the Triassic ammonite chronostratigraphic correspondence has been checked, and the major transgressive events have been identified. They occurred in the early Spathian, in the middle part of the Pelsonian, in the middle part of the Fassanian, in the early Carnian and in the Norian. As a consequence the second-order transgressive-regressive cycles in the Southern Alps have been compared and correlated with transgressive-regressive cycles in various areas.

Peak transgressions are datum-points from which it is possible to define maximum regressions and sets of stacked third-order depositional sequences. As the third-order sequences are also often well calibrated, a sequence stratigraphic setting including approximately 20 depositional sequences (6 +/- 1 in the Scythian, 4 in the Anisian, 3 in the Ladinian, 4 in the Carnian, possibly 2 in the Norian and lastly 2 in the Rhaetian) seems to be well documented.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994