Zespoły sporowo-pyłkowe z pogranicza karbonu i permu okolic Okrzeszyna

Abstract

SPORE-POLLEN ASSEMBLAGES OF THE CARBONIFEROUS/PERMIAN BOUNDARY OF THE OKRZESZYN AREASummaryA rich assemblage of spores and pollen grains (Fig. 3, Tab. 1) has been found in the shale and sandy shale samples collected from four exposures in the south-western part of the Intra-Sudetic depression. The microflora from the shale (exposure 1 and 2) indicates that the shales should be classified into Autunian-Stephanian. Sporomorphs with trilete marks are extremely rare and represented by the genera: Leiotriletes, Calamospora, Cyclogranisporites, and Verrucosisporites. There is a regression of the genus Lycospora. The amount of monolete forms increases; Laevigatosporites, Punctatosporites, Thymospora, Spinosporites, and Speciososporites make up 56%. Among the monosaccata pollen grains Florinites makes up 10-20%, Wilsonia disappears (5%), and the share of the genus Potonieisporites increases (5-30%). The microflora separated from sandy shales from exposure 3 and 4 (Fig. 2) belongs to the Autunian. The above is supported by the almost complete disappearance of microspores with trilete mark. Only Calamospora (2-10%) and Cyclogranisporites (3-6%) are widespread. The genus Lycospora disappears almost completely (0-1%). The amount of monelete sporomorphs decraeses and averages 30-35%. Spruce and Cordaites pollens become increasingly more significant. Pollen grains of the genera Florinites, Potonieisporites, and Cordaitina make up 38-40%. Occasionally Wilsonia has been recognized. Bisaccata pollen grains (2-4%) appear and chiefly the Pityosporites genera. The lack of other genera of Disaccites is striking. The variability of the spore-pollen assemblage of shales and sandy shales reflects the variability at the flora. In the lower part of the beds examined a microfloristic assemblage has been preserved that still bears affinities to the humidphilous Carboniferous flora, while the upper part of the sequence contains a typical Permian microfloristic assemblage of the continental climate.