Nuevas huellas de dinosaurios del Jurásico Superior en el norte de Chile
Sauropod and theropod footprints have been identified west of the city of Calama, Region II of Chile, in red beds belonging to the Estacio?n Member of the San Salvador Formation (Kimmeridgian - Lower Cretaceous). Narrow-gauge sauropod ichnites and three different morphologies of theropod footprints are described: A) medium- to large-sized tetradactyl impressions, with little difference in size between digits II-IV, and a II-IV interdigital angle of 66_; B) small- to medium-sized tridactyl prints, with a marked difference in size between digits III and II/IV, and a II-IV interdigital angle of 85_; and C) a subaqueous tridactyl print, probably made by only one foot of the animal. The San Salvador tracksite is assumed to be Upper Jurassic in age, because it is similar to other tracksites of this period in lacking wide-gauge sauropod footprints. This fact is probably correlated with the absence of titanosaurid body fossils in the Jurassic of South America. _ Asociacio?n Paleontolo?gica Argentina.