Mass extinctions are insanely catastrophic—but important—events that punctuate the history of life on Earth. The Jurassic/Cretaceous boundary was originally thought of to represent a mass extinction but has subsequently been “downgraded” to a minor extinction event based on new discoveries. However, compared to other important stratigraphic boundaries, like the end-Triassic or the end-Cretaceous, the Jurassic/Cretaceous boundary remains really poorly understood.
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