Formation of the Isthmus of Panama.

Abstract:

:The formation of the Isthmus of Panama stands as one of the greatest natural events of the Cenozoic, driving profound biotic transformations on land and in the oceans. Some recent studies suggest that the Isthmus formed many millions of years earlier than the widely recognized age of approximately 3 million years ago (Ma), a result that if true would revolutionize our understanding of environmental, ecological, and evolutionary change across the Americas. To bring clarity to the question of when the Isthmus of Panama formed, we provide an exhaustive review and reanalysis of geological, paleontological, and molecular records. These independent lines of evidence converge upon a cohesive narrative of gradually emerging land and constricting seaways, with formation of the Isthmus of Panama sensu stricto around 2.8 Ma. The evidence used to support an older isthmus is inconclusive, and we caution against the uncritical acceptance of an isthmus before the Pliocene.

journal_name

Sci Adv

journal_title

Science advances

authors

O'Dea A,Lessios HA,Coates AG,Eytan RI,Restrepo-Moreno SA,Cione AL,Collins LS,de Queiroz A,Farris DW,Norris RD,Stallard RF,Woodburne MO,Aguilera O,Aubry MP,Berggren WA,Budd AF,Cozzuol MA,Coppard SE,Duque-Caro H,Finne

doi

10.1126/sciadv.1600883

subject

Has Abstract

pub_date

2016-08-17 00:00:00

pages

e1600883

issue

8

issn

2375-2548

pii

1600883

journal_volume

2

pub_type

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