Sign up for CNN's Wonder Theory science newsletter.Explore the universe with news on fascinating discoveries, scientific advancements and more.The final resting place for dozens of massive prehistoric marine reptiles lies in what's now Nevada's Humboldt-Toiyabe National Forest.But why the ichthyosaurs died in such large numbers at this one particular fossil site some 230 million years ago has long been a source of debate among paleontologists.
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