Dinosaur Tracks and Trackways from the Upper Jurassic Guará Formation, Paraná Basin, Brazil

The JurassicJurassic Guará FormationGuará formation (Paraná BasinParaná basin) was established in the early 2000's and since then dinosaur tracks and trackways have been found at the southwestern Rio Grande do Sul State of BrazilBrazil and in its Uruguayan counterpart, the Batoví MemberBatoví member of the Tacuarembó FormationTacuarembó formation. SauropodSauropods, theropodTheropods, ankylosaursAnkylosaur and ornithopodOrnithopods dinosaur tracks have already been described from eolian facies of the Guará-Batoví unit, but some other new findings are reported here for first time. Saurischian tracksSaurischian tracks are the most common, being represented by narrow- to very wide-gauge sauropodSauropods trackways and at least two theropodTheropods track morphotypes, one of which comparable to the ichnogenera Iberosauripus and Jurabrontes. OrnithischianOrnithischians tracks are rarer but, up to this point, two lineages have been recorded. Ankylosaur tracksAnkylosaur tracks were recently described and compared to Metatetrapous, conjecture corroborated by new material. Ornithopod tracksOrnithopod tracks are underrepresented at the Guará-Batoví. Although the dinosaur track record of the Guará-Batoví unit is mostly composed of undertracksUndertracks, true tracksTrue track can also occur. This work aims to present a concise state of the art about the dinosaur ichnology of the Guará-Batoví unit. Together with invertebrate traces and the body fossil record of this unit, the paleogeographical, paleoenvironmental and paleoclimatic context of the dinosaur tracks are discussed.