Two other dinosaurs from this formation, Ischisaurus cattoi and Frenguellisaurus ischigualastensis, are now believed to be subadult Herrerasaurus. Fossils have not been found anywhere else. Herrerasaurus was found in the Ischigualasto Formation, particularly Ischigualasto Provincial Park (sometimes called Valley of the Moon). Herrerasaurus lived about 231 million years ago, during the Ladinian epoch of the Middle Triassic. Among the earliest known dinosaurs, Herrerasaurus (meaning “Herrera’s reptile from Ischigualasto”) was discovered in 1959 near San Juan, Argentina by a goatherd named Victorino Herrera, and was described by paleontologist Osvaldo Reig in 1963.
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