SciELO - Scientific Electronic Library Online

vol.42 issue3Stratigraphy and sedimentology of the terminal fan of Candeleros Formation (Neuquen Group), Lower Cretaceous, Neuquen Basin, provinces of Neuquen and Mendoza, ArgentinaSr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) Basin, Argentina author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google


Andean geology

On-line version ISSN 0718-7106


FERRARI, S. Mariel  and  BESSONE, Santiago. A new Early Jurassic marine locality from southwestern Chubut Basin, Argentina. AndGeo [online]. 2015, vol.42, n.3, pp.349-363. ISSN 0718-7106.

A shallow marine invertebrate association is reported from a new Early Jurassic locality namely La Casilda, which is situated in the southwestern region of the Chubut Basin (Patagonia, Argentina). The marine deposits of La Casilda are located in the Río Genoa valley and bear a diverse invertebrate fauna including bivalves, gastropods, brachiopods, echinoderms and corals. A preliminary taxonomic analysis of the invertebrate fauna suggests that La Casilda deposits belong to the Mulanguiñeu Formation of late Pliensbachian-early Toarcian age, and may be coeval with those from the marine localities previously sampled in other regions of the Río Genoa valley. The preliminary results of a biodiversity analysis displayed that La Casilda is one of the most diverse localities at the Chubut Basin and could be assigned to the biofacies at the mixed siliciclastic-carbonate ramp proposed for the marine Early Jurassic at the Andean Basin of northern Chile. The evolution of the marine transgression during the early Pliensbachian-early Toarcian is also interpreted here in a time scale based on ammonite faunas, giving a preliminary temporal reconstruction of the entire Chubut Basin.

Keywords : Invertebrates; La Casilda; Mulanguiñeu Formation; Chubut Basin; Argentina.

        · abstract in Spanish     · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License