PALINOSTRATYGRAFIA, PALEOEKOLOGIA i PALEOKLIMAT PÓŹNEGO PERMU I TRIASU NIECKI NIDY

Abstract

PALYNOSTRATIGRAPHY, PALAEOECOLOGY AND PALAEOCUMATE OF THE LATE PERMIAN AND TRIASSIC OF THE NIDA BASIN

Abstract. Ten miospore zones are identified in the Upper Permian and Triassic succession of the Nida Basin. This is the first complete biostratigraphical study of these sediments. The palynological investigation confirmed the presence of the late Anisian and early Ladinian. In addition, they allowed determining more precisely the boundaries between lnduan and Olenekian as well as Norton and Rhaetian. Xeromorphic elements dominate the Upper Permian and Triassic palynomorph spectra from the Nida Basin and reflect a mainly dry palaeoclimate. Significant numbers of hygromorphic elements indicating temporarily humid phases, occur in the Olenekian, Ladinian, Norian and Rhaetian. Continental sedimentation in fluvial, lacustrine, coastal, piaya and sabkha environments prevailed during most of the Late Permian and Triassic but was interrupted by marine transgressions in the late Wuchiapingian, early lnduan, Anisian as well as Ladinian.