Stephen Hasiotis

Stephen Hasiotis is a geologist who in 1996 discovered 220 million-year-old, fossilized, bowl-like nests in Arizona's Petrified Forest, in part of the Chinle Formation. The oldest such nests that have been found belonged to phytosaurs and aetosaurs. The nests are compacted and appear very similar to the nests of the modern day crocodiles who guard their nests. The nests were holes dug in the sand in the bank of an ancient river.