PALINOLOGÍA DE LA FORMACIÓN EL TRAMPEADERO (CARBONÍFERO SUPERIOR), LA RIOJA, ARGENTINA: SIGNIFICADO BIOESTRATIGRÁFICO

GUTIÉRREZ, P.R.; BARREDA, V.D.

AMEGHINIANA

Lugar: Buenos Aires; Año: 2006 vol. 43 p. 71 - 84

0002-7014

Palynology of the El Trampeadero Formation (Upper Carboniferous), La Rioja Province, Argentina: a biostratigraphic aproach. A diverse and relatively well preserved palynological assemblage recovered from El Trampeadero Formation is here described. This assemblage is composed by elements of continental origin: woody particules, cuticules, spores, pollen grains and algae. The dominant spore species are Apiculiretusispora ralla (Menéndez and Azcuy) Menéndez and Azcuy, Ahrensisporites cristatus Playford and Powis, Anapiculatisporites argentinensis Azcuy, Convolutispora muriornata Menéndez, Cristatisporites menendezii (Menéndez and Azcuy) Playford, C. stellatus (Azcuy) Gutiérrez and Limarino, Dibolisporites lictor Foster and Helby, Psomospora detecta Playford and Helby, Raistrickia sp. cf. R. accincta Playford and Helby, Cordylosporites sp. cf. C. asperdictyus (Playford and Helby) Dino and Playford, R. magnidictyus Playford and Helby, R. passapectus Ottone, Spinozonotriletes hirsutus Azcuy, Verrucosisporites patelliformis (Menéndez) Gutiérrez and Césari. Moreover, Dibolisporites disfacies Jones and Truswell was recorded for the first time for the  Paganzo Basin. Monosaccte (Plicatipollenites spp., Cannanaropollis) and bisaccate (Alisporites sp., Limitisporites sp.) pollen grains were also recognized for this unit. Considering the known chronostratigraphic ranges of some key species, a Late Carboniferous (late Namurian-Westphalian) age is here proposed for the El Trampeadero Formation. The abundance of palynomorphs with affinities to  higro and hidrophitic plants (lycophites) are in accord with the lacustrine environment suggested by sedimentological evidences.