University of Florida researchers Jonathan Bloch, left, and Alex Hastings unearth fossils from the 60-million-year-old Cerrejon formation in northeastern Colombia, one of the world’s largest open-pit coal mines. In a study published Sept. 15 in Palaeontology, the researchers from the Florida Museum of Natural History on the UF campus describe Acherontisuchus guajiraensis, an ancestor of crocodiles. Photo taken Jan. 3, 2007.