Granos de polen de la Formación Las Cabras (Triásico) en su localidad tipo, Provincia de Mendoza, Argentina. Parte 2.

ZAVATTIERI, A. M.

AMEGHINIANA

ASOCIACION PALEONTOLOGICA ARGENTINA

Lugar: Buenos Aires; Año: 1991 vol. 28 p. 205 - 224

0002-7014

The sistematic study of the Triassic microflora of Las Cabras Formationin its type locality, Mendoza Province, are completed. 40 species of pollen grainsare 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 botanicalaffinity. The chronological range and the regional and worldwide distribution. Atlast, are presented the preliminary conclusions of this sistematic study of pollengrains (Part 1 and 2), the porcentual variations of the main genera along the sequenceare qualitatively analized. 26 species of pollen grains are registered for thefirst time in the Triassic sediments of the Cuyo Basin, belonging to 13genera which are also recorded for the first time in the Argentine Triassic. Theage of Las Cabras Formation in its type locality, is Middle Triassic (Upper Anissian-Ladinian),and its included forthe new distribution of the concept of "Ipswich Microflora" (ofthe Middle to early Upper Triassic of Australia) in the context of gondwanaTriassic.