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The Guará Formation is a Late Jurassic sedimentary unit, outcropping on the southeastern edge of the Paraná Basin; in the western part of Rio Grande do Sul state (Brazil) and western Uruguay. It is described as fine to conglomeratic sandstones, deposited in arid to semiarid climate, composing fluvial channels and flood plains in the northern portion and aeolian dunes alternating with ephemeral fluvial systems in the south. The main fluvial paleocurrents are from NE to SW, marking a unique period in geological history of the Paraná Basin where its depocenter was shifted to the SW.

The Guará Formation is a Late Jurassic sedimentary unit, outcropping on the southeastern edge of the Paraná Basin; in the western part of Rio Grande do Sul state (Brazil) and western Uruguay. It is described as fine to conglomeratic sandstones, deposited in arid to semiarid climate, composing fluvial channels and flood plains in the northern portion and aeolian dunes alternating with ephemeral fluvial systems in the south. The main fluvial paleocurrents are from NE to SW, marking a unique period in geological history of the Paraná Basin where its depocenter was shifted to the SW.

[[file:Guara_01.jpg|left|thumb|Figure 1. Simplified geological map of Paraná Basin in Rio Grande do Sul state, Brazil. (modified from Scherer & Lavina, 2005)<ref name=Scherer_et_Lavina_2005 />]]

[[file:Guara_01.jpg|left|Figure 1. Simplified geological map of Paraná Basin in Rio Grande do Sul state, Brazil. (modified from Scherer & Lavina, 2005)<ref name=Scherer_et_Lavina_2005 />]]

==Definition==

==Definition==