Paleontología y geología del Pleistoceno de las provincias de Chaco y Formosa, Argentina

CONTRERAS, S.; MÉNDEZ, C.R.; ZURITA, A.E.; LUTZ, A.L.; ORFEO,O.; MIÑO BOILINI, A. R.; FRIEDRICH, J

OPERA LILLOANA

Fundación Miguel Lillo

Lugar: San Miguel de Tucumán; Año: 2019 vol. 52 p. 446 - 465

0078-5245

Paleontology and geology of the Pleistocene from chaco and formosa Provinces, argentina?. Recently, the paleontological and paleoenvironmental knowledge of the Pleistocene of the Eastern Chaco has increased significantly, especially in Corrientes and Formosa provinces. While the province of Chaco was less studied. In these last two provinces, the great diversity is represented by mammals, with records of 17 taxa in Chaco and 25 taxa in Formosa. All records of the Chaco province indicate the predominance of open grassland environments with arid / semi - arid climate, congruent with a glacial period. Also, the absolute dating associated with fossils indicated an antiquity of 22 ka to 26 ka. In addition, the Formosa fossils recorded, with precise stratigraphic origin, were taken from the Río Bermejo Formation. Generally, they show the predominance of open environments, but taxa of humid and warm climates (eg Holmesina paulacoutoi and Procyon cancrivorus) are also recorded. The data obtained for this unit indicate that these associations correspond to the late Pleistocene-Early Holocene (12.4 ka to 9.7 ka). The paleobotanical evidence associated to these levels shows a predominance of the herbaceous component, with megatermic grasses, developed mainly under a warm-temperate climate and sub-humid conditions. The taphonomic evaluation of Río Bermejo Formation remains shows in its attributes the dynamics of the river system of the Bermejo river during the last part of Pleistocene.