Diinosaur-yada waxay ka soo baxeen awoowayaashood archosaur intii lagu jiray bartamihii illaa dhamaadkii Triassic, qiyaastii 20 milyan oo sano ka dib dhacdadii dabar go'a Permian<unk>Triassic ee tirtirtay qiyaastii 95% dhammaan nolosha dhulka. Taariikhda radiometric ee sameynta dhagaxa oo ay ku jireen lafdhabarta dinosaur hore ee nooca Eoraptor ee 231.4 milyan oo sano jir ah ayaa aasaasay joogitaankeeda diiwaanka qadiimiga ah waqtigan. Paleontologists waxay u maleynayaan in Eoraptor uu la mid yahay awoowe guud ee dhammaan dinosaur-yada; haddii tani ay run tahay, astaamaheeda waxay soo jeedinayaan in dinosaur-yadii ugu horreeyay ay ahaayeen kuwo yaryar, ugaadhsadeyaal laba-lugoodle ah.
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