Lau event
The Lau event was the last of three relatively minor mass extinctions ( the Ireviken , Mulde , and Lau events ) during the Silurian period . 
<triplet> Lau event <subj> mass extinction <obj> instance of <triplet> Ireviken <subj> mass extinction <obj> instance of <triplet> Mulde <subj> mass extinction <obj> instance of <triplet> Lau event <subj> mass extinction <obj> instance of