A new Late Miocene chondrichthyan assemblage from the Chagres Formation, Panama

Authors
Carrillo Briceño, Jorge D.; De Gracia, Carlos; Pimiento, Catalina; Aguilera, Orangel A.; Kindlimann, René; Santamarina, Patricio Emmanuel; Jaramillo, Carlos
Publication Year
2015
Language
English
Format
article
Status
Published version
Description
The Late Miocene Chagres Formation from northern Panama contains the youngest outcrops of the Panama Canal Basin. Here we report two chondrichthyan assemblages that include 30 taxa from both the Rio Indio and Chagres Sandstone Members of the Chagres Formation. We report 18 new fossil records for Panama and four for tropical America, constituting the most diverse chondrichthyan association for the Cenozoic of Panama. We performed a paleobathymetry analysis based on the modern water depth preference of extant chondrichthyan taxa. The assemblage from the Rio Indio Member is characterized by taxa with neritic affinities, suggesting depths <100 m, whereas the assemblage from the Chagres Sandstone Member is dominated by taxa with oceanic affinities, suggesting 200e300 m water depths. The Chagres Sandstone Member could have accumulated at the edge of a platformeupper slope, bordered by a deep oceanic margin.
Fil: Carrillo Briceño, Jorge D.. Universitat Zurich; Suiza
Fil: De Gracia, Carlos. Smithsonian Tropical Research Institute; Panamá
Fil: Pimiento, Catalina. Smithsonian Tropical Research Institute; Panamá. University of Florida; Estados Unidos
Fil: Aguilera, Orangel A.. Universidade Federal Fluminense; Brasil
Fil: Kindlimann, René. Universitat Zurich; Suiza
Fil: Santamarina, Patricio Emmanuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Jaramillo, Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Smithsonian Tropical Research Institute; Panamá
Subject
Neogene
Tropical America
Panama Canal Basin
Sharks
Rays
Paleoecology
Meteorología y Ciencias Atmosféricas
Ciencias de la Tierra y relacionadas con el Medio Ambiente
CIENCIAS NATURALES Y EXACTAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/46693