For decades, paleontologists have tried to explain what they assumed was a 230-million-year-old scene of mass death.
A life reconstruction of the ichthyosaur Shonisaurus popularis, which swam an ocean that covered what is now Berlin-Ichthyosaur State Park in Nevada. A research team believes they have definitively solved the mystery surrounding a cluster of 230-million-year-old fossils of these whale-sized predatory marine reptilians that were found in the rocks of Nevada’s West Union Canyon, which was long assumed to be a mass death.
The canyon’s most famous cluster of corpses, a grouping of at least seven skeletons known as Quarry 2, can be visited at Berlin-Ichthyosaur State Park. Scientists have speculated about the ichthyosaurs of Quarry 2 since they were first excavated in the 1950s by Charles Camp, a University of California, Berkeley, paleontologist.
To rule out poisoning or asphyxiation from, say, volcanic eruptions, the team assessed levels of mercury and oxygen preserved in the rock and did not find anything suspicious. The only other strange thing about the canyon was the lack of other preserved life-forms, such as fish or other types of ichthyosaur. Pyenson said they found only Shonisaurus and nothing else, not even prey that the carnivorous reptiles could have dined on.
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