image: Miocene columnar basalts that contributed to the formation of the Isthmus of Panama are removed for the expansion of the Panama canal. This material relates to a paper that appeared in the Aug. 17, 2016, issue of Science Advances, published by AAAS. The paper, by A. O'Dea at Smithsonian Tropical Research Institute in Balboa, Panama, and colleagues was titled, 'Formation of the Isthmus of Panama.' view more
Credit: Aaron O'Dea