Late Devonian Biotic Crisis: An Extinction by Any Other Name

Frasnian Age

The Late Devonian (Frasnian – Famennian) extinction was a biodiversity crisis that took place in the end of the period. This was marked by a large decrease in production of new species, rather than the dying off of old species which is more typically described as “mass extinction”. There are competing hypotheses as to the reason for the crisis, but a sort of “step-down” extinction resulting from many meteor impacts over millions of years has been proposed as one mechanism.