Comportamiento gregario aparente de dinosaurios condicionado por una deformación sinsedimentaria. (Igea, La Rioja. España)

Abstract

During the sedimentation of the «Era del Peladillo» strata, there are sorne movements of tectonic inestability that produced their deformation. Deformation rubbed former structures (prints), created new others (steps, nodes, etc.) and allowed long ponds to formo In these ponds a group of small teropodes dinosaurs left their prints. There are criteria enough in the outcrop to state a sequence of events. These events will allow to establish the sedimentation environment, the step sequence sucession of sorne dinosaurs groups, the relative age of the sedimentary deformation, the appearance of a structural barrier and the gregarious behaviour of these vertebrates.