Microflora de la Formación Panguipulli (Triásico Superior), en Licán Ray, Lago Calafquén, 10º Region, Chile

ZAVATTIERI, A.M., HERBST & MUÑOZ BRAVO

AMEGHINIANA

ASOCIACION PALEONTOLOGICA ARGENTINA

Lugar: Buenos Aires; Año: 2003 vol. 40 p. 585 - 600

0002-7014

MICROFLORA OF THE PANGUIPULLI FORMATION (UPPER TRIASSIC) AT LICÁN RAY, LAKE CALAFQUÉN, 10TH REGION, CHILE. Triassic continental sedimentary sequences from several localities of central Chile were sampled for palynological study. A moderately well preserved continental assemblage in one sample from Panguipulli Formation, at Licán Ray, north of Lake Calafquén (39º 30? S - 72º 12? W), 10º Región of Chile is recorded. The sequence represents a deltaic-lacustrineenvironment of deposition. The Panguipulli assemblage is composed of 17 species of bryophytic and pteridophytic spores assigned to the genera Apiculatisporis, Aratrisporites, Baculatisporites, Cacheutasporites, Calamospora, Deltoidospora, Dictyophyllidites, Gleicheniidites, Neoraistrickia, Osmundacidites, Punctatisporites and Rogalskaisporites representing almost 17 % of the total assemblage. Diverse gimnospermous pollen grains dominate the microflora with 81,9% including 26 species of the genera Accinctisporites, Alisporites, Chordasporites, Cuneatisporites, Cycadopites, Equisetosporites, Falcisporites, Goubinispora, Inaperturopollenites, Klausipollenites, Lunatisporites, Minutosaccus, Platysaccus,Podocarpidites, Protodiploxypinus, Sulcatisporites, Sulcosaccisporaand Vesicaspora. The microflora is associated with a megafloracomposed of species of the genera Dicroidium, Cladophlebis, Gleichenites, Linguifolium, Pseudoctenis and Sphenobaiera, among others. This microfloristic assemblage differs partially from the only other Triassic microflora previouslyrecorded in Chile from the Llafquentué-Huimpil Formation. Comparison with Argentine and other Gondwanic microfloras, favours an early Late Triassic age for the Paguipulli Formation which corresponds to the Ipswich Microflora of the gondwanic microfloristic provinces. Such as, the Panguipulli microflora represents floral communities of temperate to warm-temperate climate highly seasonal that points to a local moist environment.