Stratigraphy of the Iguape-Cananéia lagoonal region sedimentary deposits, São Paulo State - Brazil: part II: heavy minerals studies, microorganisms inventories and stratigraphical interpretations
This paper deals, with the studies of the heavy minerals and microorganisms contained in the sediments of the Iguape-Cananeia lagoonal region. The microorganisms from the subsurface samples and from the present different environments were compared. As a result an inestimable tool was acquired for the reconstruction of the areal sedimentation history. The heavy minerals gave indications about the source rocks of the sediments, mostly concerning to the regressive sands, blanket sands type deposits (KRUMBEIN and SLOSS, 1963, p. 550). The presence of well distinctive four sedimentation unities were recognized as a record of the geological events in the area. The Pariquera-Acu Formation, old alluvial deposits spreaded in the Ribeira de Iguape hydrographic basin, particularly along the course of the Jacupiranga River (as indicated in the map of FRANZINELLI, 1970), was here recognized as a direct consequence of the quaternary events, occurred downstream, in the Iguape-Cananeia lagoonal region.
