A rock core from Petrified Forest National Park, Arizona, has given scientists a powerful new tool to understand how catastrophic events shaped Earth’s ecosystems before the rise of the dinosaurs.
Before the rock core was recovered, most of what was known about the Late Triassic came from searching for signs
of the Chinle Formation on rocky outcrops such as this one, found throughout Petrified Forest National Park.
The rock layers…
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