Palynological and Stratigraphical Problems of Middle Triassic Siliciclastics from Croatian Off-shore Well Susak More-1 (Adriatic Sea) and NW Slovenia

Abstract

The palynological assemblages from Slovenian Middle Triassic sections and Susak More-1 off-shore well always contain Permian, Scythian and Scythian-Lower Anisian palynomorphs. Middle Triassic palynomorphs were very rare (as in well SM-1) and totally absent in almost all Slovenian sections strongly suggesting the possibility that in these sections the Permian palynomorphs were reworked into the Scythian-Lower Anisian deposits. This palynostratigraphical evidence was clearly in contradiction with the age of some of these chronostratigraphically well defined Slovenian Upper Anisian-Ladinian sections.

As the siliciclastics in well SM-1 are only palynostratigraphically controlled, the correlation with Slovenian sections is entirely based on palynological analogy.

The palynological analogy of the Slovenian sections, Susak More-1 off-shore well and palynostratigraphycally controlled Middle Triassic siliciclastics from off-shore well Maja-1 (open sea side of the south Croatian Islands) indicates on a regionally extensive sedimentary realm which resulted from the aborted rifting during the Middle Triassic.