Rivers of rock and gas froze ancient animals in time

Well-preserved Cretaceous fossils buried in Chinese formations by pyroclastic flows

SKELETAL STORY  An antelope-sized Psittacosaurus dinosaur (left) and two crow-sized Confuciusornis bird fossils (center and right) show postures common among entombed animals, suggesting the creatures perished in a sudden flow of volcanic rock and gas.

Baoyu Jiang

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