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PRIMER REGISTRO DEL PALEOCENO EN EL URUGUAY: PALEOSUELOS CALCAREOS FOSILIFEROS EN LA CUENCA DE SANTA LUCIA

1997; Sociedade Brasileira de Geologia; Volume: 27; Issue: 3 Linguagem: Inglês

10.25249/0375-7536.1997295302

2177-4382

Sergio Martı́nez, Gerardo Veroslavsky, Mariano Verde,

Cultural and Mythological Studies

LUCIA BASIN (URUGUAY)For the first time, the Paleocene is recorded in Uruguay, developed at the central area of Santa Lucia Basin.It is represented by non depositional events, recognized as carbonatic paleosols, containing a characteristic fossil record.Up to date these carbonate deposits were included in the deposits known as "Calizas del Queguay" (Queguay Limestones), and considered as belonging to Mercedes Formation (Upper Cretaceous), interpreted as lacustrine facies laterally associated with sandstone and conglomérate fluvial facies.However, researches conducted by the authors have shown that these deposits are the product of calcretization processes that affected the Mercedes Formation clastic sedimentites.The calcareous, fossiliferous paleosols were developed overimposed at the top of the groundwater calcretes.The fossils found are: pulmonate gastropods (Eoborus charruanus), endocarps of Celtis santosi, rizoliths, and bee nests (Celliforma spp.).This association is typical of paleosols and the age of all the fossils is Tertiary.The gastropods have very similar representatives at the Paleocene of the São José de Itaboraí Basin (Rio de Janeiro, Brazil), being the Uruguayan and Brazilian representatives of Eoborus the only species known of this genus.The Celtis santosi endocarps are present only at these two basins.Then, a Paleocene age is postulated for the paleosols and for the event of calcretization, developed under a warm and arid environment.