Dirley Cortés

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Co-author of the Paja Formation review

In the hills near Villa de Leyva, Colombia, the Paja Formation holds the bones of long-necked plesiosaurs, marine crocodile relatives, turtles and sharks, all packed into Early Cretaceous rock. A team from McGill University and the Centro de Investigaciones Paleontológicas read that assemblage as a snapshot of two biological eras overlapping: lineages on their way out, living beside lineages on their way up.

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