Cretaceous
Paleontologists have identified Xenovenator espinosai, a carnivorous dinosaur from 74 million years ago found in Coahuila, linking large and small carnivores in the area. This troodontid measured about 3 meters long and hunted in what was the Cerro del Pueblo formation. The discovery highlights Coahuila's rich paleontology, with 15 genera documented.
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A tiny fossil fish discovered in southwestern Alberta is the oldest North American otophysan, offering new insights into the evolution of freshwater fish species. Named Acronichthys maccognoi, the 4 cm specimen from the Late Cretaceous period suggests otophysans transitioned from marine to freshwater environments at least twice. The find, detailed in a study published on October 2 in Science, challenges previous understandings of their global spread.