The Devonian Mass Extinction  Fast Facts  - Devonian period
ranged from 408-360 million years ago  - A major intra-Devonian
extinction occurred at the Frasnian-Famennian boundary
Geological Setting  Following the Ordovician mass extinction
rediversification of surviving groups occurred throughout the
Silurian and Devonian. In addition, the Devonian saw the first
appearance of sharks, bony fish, and ammonoids. During the
Devonian the world's oceans were dominated by reef-builders such
as the stromatoporoids, and corals, and some of the world's
largest reef complexes were built. Terrestrial newcomers in the
Devonian included amphibians, insects, and the first true land
plants, giving rise to the first forests.  Species Affected  The
Devonian mass extinction occurred during the latter part of the
Devonian at the Frasnian - Famennian boundary. The crisis
primarily affected the marine community, having little impact on
the terrestrial flora. This same extinction pattern has been
recognized in most mass extinction