PALYNOLOGY (ANGIOSPERM POLLEN GRAINS) FROM SOLIMOES AND ICA FORMATIONS (SOLIMOES BASIN), IN COARI AND ALTO SOLIMOES REGIONS, AMAZONAS

A total of 93 samples collected at 12 outcrops from Solimoes and Ica formations, in the region of Coari (five outcrops) and Alto Solimoes (seven outcrops), Amazonas State, was conducted for pollen analysis. Palynomorphs recovered comprise sporomorphs (representatives of fungi, ferns, gymnosperms and angiosperms), algae cysts and scolecodont. In general, the specimens are well preserved, rarely presenting corrosion or breaking, resulting in an exceptional photomicrographic record. This paper presents the 48 angiosperm pollen grains, appropriately illustrated and described, when needed. The composition of palynofloras in both areas presents contrasts; those ones from Alto Solimoes show less diversity, but have higher abundance in comparison with the Coari ones. In the Alto Solimoes the most common taxa are Crotoidaepollenites reticulatus, Grimsdalea magnaclavata, Monoporites annulatus, Multimarginites vanderhammeni, Retitrescolpites irregularis, Perfotricolpites digitatus, Corsinipollenites undulatus, Bombacacidites nacimientoensis, B. simpliciriloensis and Perisyncolporites pokornyi. The most common taxa in Coari are Fenestrites sp.2, Mauritiidites franciscoi, Monoporites annulatus, Retitrescolpites irreguaris, Corsinipollenites undulatus and Bombacacidites nacimientoensis. Recognition of Asteraceae indicates for deposits of the Solimoes Formation, in the region of Coari, Late Miocene-Pliocene age; and to the Ica Formation, Pleistocene age, based on the presence of Alnipollenites verus. The presence of Grimsdalea magnaclava indicates Middle Miocene age for the region Alto Solimiies. The biostratigraphy significance is preliminary discussed based on the recognition of certain guide species. Comparisons are performed taking into account coeval records in the basin.