New Micropaleontological Record (Foraminifera and Ostracoda) from the Late Glacial and Holocene in Salinas del Bebedero, San Luis, Argen-tina: a Paleoenvironmental Interpretation

CALVO MARCILESE LYDIA; D'AMBROSIO, D. SABINA; ROJO LEANDRO; CUSMINSKY GABRIELA C.

Advances in South American Micropaleontology

Springer

Año: 2018; p. 143 - 158

 Since the 1980s, just a fewstudies have been conducted related to foraminifera and ostrácoda in endorheicenvironments of Argentina. In core SB III from Salinas del Bebedero, a preliminaryreport on 51 sediment samples between 986 and 506 cm (ca. 12600-3600 yrsBP) recorded only 12 fertile samples. Seven samples showed typical marginalmarine microfaunal assemblages with high abundance of the foraminifer Ammoniatepida associated to few specimens of Elphidium excavatum.Concerning ostracods, they are poorly represented except by six levels with Limnocythereaff. staplini and Cyprideis salebrosa hartmanni. It is worthyto note that ostracods and foraminifers were not recorded coexisting, with theexception of one sample (830 ? 828 cm). The remarkably high abundance offoraminiferal assemblages, with more than 170 individuals per gram in somelevels, is outstanding and deserves special attention. The Ammonia-Elphidiumassemblage is well known in shallow marginal marine environments at globalscale, whereas the two ostracod species found are common of lacustrine environmentswith high salinity range. Previous hypothesis indicate that birds and/or thewind as vectors were responsible for the presence of that particular microfaunain Salinas del Bebedero. These preliminary studies aim to contribute to theanalysis of materials from athalassic environmental basins in order to increasethe knowledge about the typical marine microfauna living in continentalenvironments and their potential implications in paleoenvironmentalinterpretation.