Icnología de la Formación Sepulturas (Ordovícico) en el Espinazo del Diablo, Cordillera Oriental de Jujuy, Argentina

Abstract

Trace fossils of the Lower Ordovician Sepulturas Formation (Arenig) are analyzed and figured for the first time. The unit represents a marginal marine paleoenvironment (estuarine-deltaic), characterized by recurrent bioturbated wave rippled sandstone levels. High density / mid-diversity pasichnia dominates the ichnological association, being referred to the Cruziana ichnocoenosis. Highly variable paleoecological conditions along the unit characterizes the distribution of trace fossils as Cruziana furcifera d'Orbigny, Cruziana isp., Dimorphichnus obliquus Seilacher, Diplichnites isp., Monomorphichnus multilineatus Alpert, Monomorphichnus isp., Palaeophycus tubularis Hall, Thalassinoides isp. and Skolithos linearis Haldeman.