PALYNOSTRATIGRAPHY AND PALAEOGEOGRAPHY OF EARLY PERMIAN STRATA IN THE ZAGROS BASIN, SOUTHEAST- SOUTHWEST IRAN

摘要

A total of 500 Early Permian samples from the Chal-i-Sheh Formation in the Zagros Basin were examined palynologically in order to determine the stratigraphical age of the formation and to assess the palaeogeographical relationships of this basin to the Southern and Northern Hemispheres during the Early Permian. Fifty-eight taxa were recorded including 46 pollen, 10 spore and 2 acritarch species, which permitted the establishment of the age of the formation. Quantitatively, pollen contributed 98 percent, spores 1.5 percent, and acritarchs 0.5 percent of the total assemblages. The high relative percentage of gymnospermous pollen taxa suggests a relatively cold condition which was in favor of gymnospermous plants at the beginning of the Early Permian.