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Rendiconti Lincei

, Volume 2, Issue 4, pp 353–359 | Cite as

Paleontologic and biostratigraphic observations on the Pliocene of Camarones (Esmeraldas, Ecuador)

  • Walter Landini
  • Luca Ragaini
  • Lorenzo Sorbini
  • Gigliola Valleri
  • Angelo Varola
  • Ramon Vera
  • A. Azzaroli
Article

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.

Key words

Pliocene Ecuador Marine faunas 

Osservazioni paleontologiche e biostratigrafiche sul Pliocene di Camarones (Esmeraldas, Ecuador)

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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Copyright information

© Accademia nazionale dei Lincei 1991

Authors and Affiliations

  • Walter Landini
    • 1
  • Luca Ragaini
    • 2
  • Lorenzo Sorbini
    • 3
  • Gigliola Valleri
    • 4
  • Angelo Varola
    • 1
  • Ramon Vera
    • 5
  • A. Azzaroli
  1. 1.Dipartimento di Scienze della TerraUniversità degli Studi di PisaPisa
  2. 2.Museo di Storia Naturale e del TerritorioUniversità degli Studi di PisaCalci PI
  3. 3.Museo Civico di Storia NaturaleLungadige Porta VittoriaVerona
  4. 4.Dipartimento di Scienze della TerraUniversita degli Studi di FirenzeFirenze
  5. 5.Escuela Politecnica NacionalQuito

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