Argentina's Triassic dinosaur finds (1963–1993)
Fossil hunters in Argentina's Ischigualasto Valley uncovered Herrerasaurus in 1963 and Eoraptor in 1993, among the earliest known dinosaurs, dated to about 230 million years ago.
South America became the leading candidate for the cradle of the dinosaurs.
The Ischigualasto Formation became a global reference point for dating early dinosaur evolution.
The new correlation ties Tanzania's Manda Beds to these dated South American sequences, putting the Argentine record at the center of the oldest-dinosaur question.
