A 60-million-year Cenozoic history of western Amazonian ecosystems in Contamana, eastern Peru

Pierre Olivier Antoine, M. Alejandra Abello, Sylvain Adnet, Ali J. Altamirano Sierra, Patrice Baby, Guillaume Billet, Myriam Boivin, Ysabel Calderón, Adriana Candela, Jules Chabain, Fernando Corfu, Darin A. Croft, Morgan Ganerød, Carlos Jaramillo, Sebastian Klaus, Laurent Marivaux, Rosa E. Navarrete, Maëva J. Orliac, Francisco Parra, María Encarnación PérezFrançois Pujos, Jean Claude Rage, Anthony Ravel, Céline Robinet, Martin Roddaz, Julia Victoria Tejada-Lara, Jorge Vélez-Juarbe, Frank P. Wesselingh, Rodolfo Salas-Gismondi

Research output: Contribution to journalScientific review

63 Scopus citations

Abstract

We provide a synopsis of ~. 60 million years of life history in Neotropical lowlands, based on a comprehensive survey of the Cenozoic deposits along the Quebrada Cachiyacu near Contamana in Peruvian Amazonia. The 34 fossil-bearing localities identified have yielded a diversity of fossil remains, including vertebrates, mollusks, arthropods, plant fossils, and microorganisms, ranging from the early Paleocene to the late Miocene-?Pliocene (>. 20 successive levels). This Cenozoic series includes the base of the Huchpayacu Formation (Fm.; early Paleocene; lacustrine/fluvial environments; charophyte-dominated assemblage), the Pozo Fm. (middle + ?late Eocene; marine then freshwater environments; most diversified biomes), and complete sections for the Chambira Fm. (late Oligocene-late early Miocene; freshwater environments; vertebrate-dominated faunas), the Pebas Fm. (late early to early late Miocene; freshwater environments with an increasing marine influence; excellent fossil record), and Ipururo Fm. (late Miocene-?Pliocene; fully fluvial environments; virtually no fossils preserved). At least 485 fossil species are recognized in the Contamana area (~. 250 'plants', ~. 212 animals, and 23 foraminifera). Based on taxonomic lists from each stratigraphic interval, high-level taxonomic diversity remained fairly constant throughout the middle Eocene-Miocene interval (8-12 classes), ordinal diversity fluctuated to a greater degree, and family/species diversity generally declined, with a drastic drop in the early Miocene. The Paleocene-?Pliocene fossil assemblages from Contamana attest at least to four biogeographic histories inherited from (i) Mesozoic Gondwanan times, (ii) the Panamerican realm prior to (iii) the time of South America's Cenozoic "splendid isolation", and (iv) Neotropical ecosystems in the Americas. No direct evidence of any North American terrestrial immigrant has yet been recognized in the Miocene record at Contamana.
Original languageAmerican English
Pages (from-to)30-59
Number of pages30
JournalGondwana Research
Volume31
DOIs
StatePublished - 1 Mar 2016

Keywords

  • Fossil record
  • Paleobiology
  • Paleogeography
  • South America
  • Stratigraphy

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    Antoine, P. O., Abello, M. A., Adnet, S., Altamirano Sierra, A. J., Baby, P., Billet, G., Boivin, M., Calderón, Y., Candela, A., Chabain, J., Corfu, F., Croft, D. A., Ganerød, M., Jaramillo, C., Klaus, S., Marivaux, L., Navarrete, R. E., Orliac, M. J., Parra, F., ... Salas-Gismondi, R. (2016). A 60-million-year Cenozoic history of western Amazonian ecosystems in Contamana, eastern Peru. Gondwana Research, 31, 30-59. https://doi.org/10.1016/j.gr.2015.11.001