Abstract
The water circulation pattern outlined in Chap. 2 is the result of the paleogeographical changing that underwent the area because of the fragmentation of the Gondwana since Late Mesozoic times (Potter 1997; Veroslavsky et al. 2003). Although preliminary analysis performed by del Río et al. (2012) proved that the recent composition of Southwestern Atlantic assemblages is constituted by taxa coming from Neogene as well as from Paleogene times, the highest proportion of supraspecific taxa (families, genera) that survived into recent times are those of Late Miocene age.
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Martínez, S., del Río, C.J., Rojas, A. (2013). Neogene Roots. In: Biogeography of the Quaternary Molluscs of the Southwestern Atlantic Ocean. SpringerBriefs in Earth System Sciences. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6055-4_4
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