Changes

==Age==

==Age==

The Guará Formation is part of the Mesozoic fill of the Paraná Basin included in Supersequence Gondwana III (Milani et al., 1998 ) <ref name=Milani_1998>Milani, E.J.; Faccini, U.F.; Scherer, C.M.S.; Araujo, L.M.; Cupertino, J.A. 1998. Sequence and stratigraphy hierarquy of the Paraná Basin (Ordovician to Cretaceous), Southern Brazil. Bol. IG USP, Série Científica, v. 29, p.125-173.</ref> ([[:file:Guara_02.jpg|Figure 2]]). In Brazil there is no evidence of fossils that enable dating; however, its correlated unit in Uruguayan territory (Batoví Member) has a diversified fossil content, represented by gastropods, crocodilian reptiles, fish and semionotiformes conchostracans (Mones & Figueira, 1980<ref name=Mones_et_Figeuira_1980>Mones, A & Figueira, A. 1980. A geopaleontological synthesis of the Gondwana formations of Uruguay. In: CRESWELL, M.M. & VIELLA, P. (eds) Gondwana Rotterdam, A. A. Balkema, New York, p. 47-52.</ref>; Ferrando et al., 1987<ref name=Ferrando_1987>Ferrando, L.; Andreis, R.R.; Montana, J.R. 1987. Estratigrafia del Triásico – Jurásico uruguaio em la cuenca del Paraná. In: SIMP SUL-BRAS. GEOL., 3, Anais ..., v.1., p. 373-378.</ref>; among others), which allow us to assign to the Guará Formation an age between Late Jurassic and Early Cretaceous.

The Guará Formation is part of the Mesozoic fill of the Paraná Basin included in Supersequence Gondwana III<ref name=Milani_1998>Milani, E.J.; Faccini, U.F.; Scherer, C.M.S.; Araujo, L.M.; Cupertino, J.A. 1998. Sequence and stratigraphy hierarquy of the Paraná Basin (Ordovician to Cretaceous), Southern Brazil. Bol. IG USP, Série Científica, v. 29, p.125-173.</ref> ([[:file:Guara_02.jpg|Figure 2]]). In Brazil there is no evidence of fossils that enable dating; however, its correlated unit in Uruguayan territory (Batoví Member) has a diversified fossil content, represented by gastropods, crocodilian reptiles, fish and semionotiformes conchostracans,<ref name=Mones_et_Figeuira_1980>Mones, A & Figueira, A. 1980. A geopaleontological synthesis of the Gondwana formations of Uruguay. In: CRESWELL, M.M. & VIELLA, P. (eds) Gondwana Rotterdam, A. A. Balkema, New York, p. 47-52.</ref><ref name=Ferrando_1987>Ferrando, L.; Andreis, R.R.; Montana, J.R. 1987. Estratigrafia del Triásico – Jurásico uruguaio em la cuenca del Paraná. In: SIMP SUL-BRAS. GEOL., 3, Anais ..., v.1., p. 373-378.</ref> which allow us to assign to the Guará Formation an age between Late Jurassic and Early Cretaceous.

[[file:Guara_03.jpg|left|thumb|Figure 3. Vertical log and section showing the fluvial facies of Guará Formation northern portion.]]

[[file:Guara_03.jpg|left|thumb|Figure 3. Vertical log and section showing the fluvial facies of Guará Formation northern portion.]]