ABSTRACT
Pollen and spores of three samples obtained at an exposure along the Rio Salado have been studied. Samples belong to a sequence beginning with the Las Escobas Formation (marine) over which a buried soil, the Puesto Berrondo Soil, has developed. At the top, alluvial sediments occur on which the present soil develops. The pollen record shows a rich flora in this present soil level with fungi of the edaphic microflora, specially Papulaspora sp. Angiosperms of the grass steppe and freshwater algae are also present as well as bryophyta such as Phaeoceros sp. The record shows impoverishment at the buried soil level indicating differential destruction due to diagenesis. The presence of fungi and freshwater algae suggests the same pedogenesis environment that defines a hydromorphic soil. The buried soil contains dinoflagellates from the parental sediments.
