SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Fossilised skull of a mammal-like reptile. This skull (left) was from Probelesodon lewisi, a carnivorous reptile that lived during the Middle and Upper Triassic periods (245-200 million years ago). The skull was found in the Chanares formation of Argentina (seen in background) in South America.
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