The late devonian extinction was one of five major extinction events in the history of life on earth a major extinction the kellwasser event occurred at the boundary that marks the beginning of the last phase of the devonian period the famennian faunal stage the frasnian famennian boundary about 376 360 million years ago. Devonian extinctions a series of several global extinction events primarily affecting the marine communities of the devonian period 4192 million to 359 million years ago at present it is not possible to connect this series definitively with any single cause it is probable that they may record a combination of several stresses such as excessive. Mcghee g the late devonian mass extinction the frasnian famennian crisis critical moments in paleobiology and earth history series mcghee george r isbn 9780231075046 kostenloser versand fur alle bucher mit versand und verkauf duch amazon. The devonian extinction events were a series of extinctions that mainly affected the marine species during the devonian period approximately 419 million to 359 million years ago there were three major extinctions during the last half of the devonian period each separated by about ten million years the three events included were the taghanic event kellwasser event and the hangenberg event the three events are responsible for the extinction of 70 80 of all animal species during the