Battle for the Americas
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, more
|  |
| Abstract |
Scientists have long believed that the Isthmus of Panama formed 3 million to 4 million years ago, paving the way for a burst of migration between North and South America. A radical new hypothesis envisioning a much earlier land bridge could cast dozens of studies in a new light. |
|
