Original: Its fossils were found in the late Campanian-age Upper Cretaceous Cerro del Pueblo Formation (about 73.5 million years old), near Rincon Colorado, Coahuila, Mexico.
Simplified: Its fossils were found in the Upper Cretaceous Cerro del Pueblo Formation (about 73.5 million years old), near Rincon Colorado, Coahuila, Mexico.