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The Late Devonian Extinction

In Our Time: Science

CHAPTER

What's the Kelvassa Event?

The Kelvassa event is one of the big five mass extinctions that represents the changing life since the dawn of animal life on our planet. It has to be geologically abrupt or in a short geological time now that's very subjective and we don't know whether that means 10,000 years or 10 million years so it's a good question there's no real formal definition but as we tease through the databases we see that there are these big five but there are also lots of lesser calamities as they've been called. Mike and David both alluded to the big Devonian reefs so they go extinct at this event and they also whirled vast stores of oil in Australia and Canada. But

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