Paleontologists have employed biogeographic modeling to re-evaluate the origins of the earliest dinosaurs, challenging the long-held assumption that they first arose in southwestern Gondwana based on existing fossil records. The new model suggests that dinosaurs emerged earlier and closer to the ancient equator, a finding that significantly shifts the search for missing early dinosaur fossils. This research indicates that these crucial fossils are likely buried beneath the Sahara Desert and the Amazon rainforest—regions currently difficult to access and historically under-sampled—providing new, targeted directions for future paleontological expeditions.
Summarizing the Search for Early Dinosaur Origins:
0:00 Unraveling a Mystery: Paleontologists believe they've identified where to look for the missing fossils of the earliest dinosaurs.
0:05 Challenging Conventional Wisdom: The new findings suggest previous search efforts were misdirected, as the earliest dinosaurs likely did not originate in southwestern Gondwana as previously assumed.
0:21 Innovative Research Method: Researchers used biogeographic modeling to simulate the dinosaur family tree's history, accounting for regional sampling biases.
0:31 A New Point of Origin: The model indicates that dinosaurs began much earlier and closer to the ancient equator.
0:38 Difficult Dig Sites: This places the missing fossils under the Sahara Desert and the Amazon rainforest, regions that are currently hard to reach and have been significantly under-sampled.
0:48 Guiding Future Expeditions: Despite the challenges, this research provides crucial clues for where to focus future paleontological digs to find the "cradle of dino kind."
0:55 Related Media: A new "Walking with Dinosaurs" series has been launched on PBS, 25 years after the original.