Resumen. La asociación palinológica recuperada del pozo YPF.SE. LH.x-2 Los Horcones, provincia de Santiago del Estero, está dominada por Amaranthaceae/ Chenopodioideae y algas verdes continentales, con Nothofagaceae y Malvaceae subordinadas. En la parte superior de la sección muestreada hay también dinoflagelados y microforaminíferos marinos. La asociación se habría desarrollado en un ambiente lacustre. El cuerpo de agua habría estado rodeado por una vegetación mayormente hebáceo-arbustiva. El clima habría sido templado-cálido y relativamente árido. La palinoflora estaría relacionada con la ingresión marina que habría afectado el noroeste argentino durante el Mioceno medio (15-13 Ma).Palabras clave. Argentina. Mioceno. Palinomorfos. Transgresión marina.Abstract. SUBSURFACE MIOCENE PALYNOMORPHS FROM SANTIAGO DEL ESTERO, ARGENTINA. The palynological assemblage recovered from the YPF.SE. LH.x-2 Los Horcones well, Santiago del Estero Province, is dominated by Amaranthaceae/ Chenopodioideae and freshwater green algae, together with subordinate Nothofagaceae and Malvaceae. Marine dinoflagellates and foraminiferal linnings are also present in the upper half of the sampled section. This assemblage may have developed in a lacustrine environment. A mostly herbaceaous and shrubby vegetation may have surrounded the water-body. The climate may have been warm-temperate and relatively arid. The palynoflora could be related to the marine ingression that affected northwestern Argentina during the middle Miocene (15-13 My).
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