"Hollow Form" Late Triassic Pangaea 225 million - 200 million years ago Coelophysis was one of the oldest known dinosaurs. It lived mainly in what is now New Mexico.
Discovery
In 1881, David Baldwin discovered the first Coelophysis in New Mexico. Then, during the Bone Wars, Edward Drinker Cope had named it Coelophysis in 1889. Later on in Coelophysis Graveyard was uncovered with thousands of fossils in Ghost Ranch, NM.