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The Late Devonian mass extinction, also known as the Kellwasser event, was a mass extinction event which occurred around 372 million years ago, at the boundary between the Frasnian and Famennian ages of the Late Devonian period. It is placed as one of the "Big Five" most severe mass extinction events in Earth's history, with likely around 40% of marine species going extinct, though the degree of severity is contested. A second mass extinction called the Hangenberg event, also known as the end-Devonian extinction, occurred 13 million years later around 359 million years ago, bringing an end to the Famennian and Devonian, as the world transitioned into the Carboniferous Period. The effects of the two extinction events have historically been conflated, and both events collectively profoundly reshaped marine ecosystems.
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