GRANOS DE POLEN DE LA FORMACION LAS CABRAS (TRIASICO) EN SU LOCALIDAD TIPO, PROVINCIA DE MENDOZA, ARGENTINA. PARTE 2.

Abstract

The sistematic study of the triassic microflora of Las Cabras Formation in its type locality, Mendoza Province, are completed. 40 species of pollen grains are described, included in the following groups: Striatiti, Polysaccites, Poroses, Plicates, Aletes and algae rests. The studied species belonging of the genera: Protohaploxypinus, Lunatisporites, Striatoabieites, cf. Striatopodocarpites, Infernopollenites, Triadispora, cf. Dacrycarpites. Pseudoquadrisaccus, Pilasporites, cf. Perinopollenites, Megamonoporites, Psilomonoporites, Cycadopites, Monosulcites, Equisetosporites, Steevesipollenites, Araucariacites, lnaperturopollenites, Grebespora, Pediastrum and Botryococcus . There are given the botanical affinity. the chronological range and the regional and world wide distribution. At last, are presented the preliminary conclusions of this sistematic study of pollen grains (Part I and 2), the porcentual variations of the main genera along the sequence are qualitativity analized. 26 species of pollen grains are registered for the first time in the Triassic sediments of the Cuyo Basin, belonging to 13 genera which are also recorded for the first time in the Argentine Triassic. The age of Las Cabras Fonnation in its type locality, is Middle Triassic (Upper Anissian-Ladinian), and its included for the new distribution of the concept of "Ipswich Microflora" (of the Middle to early Upper Triassic of Australia) in the context of gondwana Triassic.