By Hugo Marengo
This publication gathers and updates the main major advances of the final centuries and provides an remarkable micro paleontological research protecting greater than 20 stratigraphic sections. this knowledge is supplemented through a variety of sedimentological observations and analyses, at the foundation of which a brand new lithostratigraphic framework for the Neogene of the Chacoparanense Basin is proposed.
The ebook is dependent in an easy-to-read layout: Its major part deals a complete evaluation of the present country of data on transgressions in Argentina and comparable transgressions in different South American nations, considering quite a few key elements (age, paleoenvironment, micropaleontology, etc.). Secondly, the publication provides the most effects at the TLP and TEP of the Chacoparanense Basin and the TEP of the Península de Valdés. finally, it presents readers with whole stratigraphic profiles (Appendix A), mineralogical analyses (Appendix B), distribution charts (Appendix C), systematics (Appendix D) and plates (Appendix E).
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Additional info for Neogene Micropaleontology and Stratigraphy of Argentina: The Chaco-Paranense Basin and the Península de Valdés
Sample text
Dotted lines indicates the ages of species with affinities to those found in this research From the study of these fossil groups, it can be concluded that age is better determined by the nannofossils, which indicate that the middle sector of the TEP in the Riachuelo II and Palermo 10 boreholes, as well as the lower to middle sector in Riachuelo VI borehole, were deposited in Zone NN6 (Martini 1971; Young 1998), Serravallian, Middle Miocene. 47 Ma, Pérez 2013) is helpful to estimate the end of the TEP, but there are no clues to determine the beginning of it, although the correlation with the global eustatic cycles and convergence rates in the western margin of southern South America (Fig.
Other estimations on the age of the TEP based on foraminifera are not very reliable. The ostracods have yet not been thoroughly studied, except perhaps in southwestern Entre Ríos province (Rossi de García 1966, 1969a; Zabert and Herbst 1977), and to a lesser extent in the Colorado and Salado Basins (Malumián 1970) and the Chacoparanense Basin (Zabert 1978; Bertels and Zabert 1980; Zabert and Barbano 1984). Even though all available data have not been compared, these ostracod faunas would be very homogeneous and indicate the same environmental conditions as the foraminifera.
1 Distribution The TLP (Figs. 3) has a geographical distribution that is similar to but slightly larger than the TEP (Figs. 6). As shown in the stratigraphic sections (Figs. 9), the TLP was deposited over rocks of very different ages. They are lying directly over the Precambrian basement rocks (La Maruja), Las Breñas Formation (Silurian, YPF Pirané x−1), the Sachayoj Formation (Carboniferous-Permian, Caburé 1), the Early Cretaceous basalts of the Serra Geral Formation (Laguna Paiva 1), or the Palermo Member of the Chaco Formation (Sect.
