Abstract
Studies on the Onzole Formation outcropping close to the Camarones village (Esmeraldas Province, Northwestern Ecuador) have been carried out. Analyses on foraminifer, otolith and mollusc assemblages have shown an age referable to the Early Pliocene and a bathyal environment. These communities correspond to those of the modern Tropical East Pacific Province. However in the ichthyofauna some taxa, today related to the cool California Current, occur.
Riassunto
È stato intrapreso uno studio di dettaglio sulle associazioni a foraminiferi, a molluschi e a otoliti della Formazione Onzole, affiorante nei dintorni del villaggio di Camarones (Provincia di Esmeraldas, Ecuador settentrionale). E stato possibile attribuire al Pliocene Inferiore (Zona N 19; Blow, 1969) i sedimenti considerati. Inoltre è stato possibile riconoscere un ambiente di deposizione batiale superiore. Le associazioni riconosciute sono simili a quelle della bioprovincia del Pacifico orientale tropicale, tuttavia la presenza nell’ittiofauna di taxa attualmente legati alla corrente fredda della California, permette di ipotizzare la formazione, durante il Pliocene Inferiore, di una soglia (Panama-Galapagos-Cocos) che avrebbe separato la provincia del Pacifico orientale tropicale dalla provincia californiana.
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Nella seduta dell’11 maggio 1991.
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Landini, W., Ragaini, L., Sorbini, L. et al. Paleontologic and biostratigraphic observations on the Pliocene of Camarones (Esmeraldas, Ecuador). Rend. Fis. Acc. Lincei 2, 353–359 (1991). https://doi.org/10.1007/BF03000991
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DOI: https://doi.org/10.1007/BF03000991