Avalon explosion
The Avalon explosion, named from the Precambrian fauna of the Avalon Peninsula, is a proposed evolutionary radiation in the history of the Animalia, about 575 million years ago in the Ediacaran Period, some 33 million years earlier than the Cambrian explosion. Evidence. Trace fossils of these Avalon organisms have been found worldwide, and represent the earliest known complex multicellular organisms. The Avalon explosion theoretically produced the Ediacaran biota. The biota largely disappeared contemporaneously with the rapid increase in biodiversity known as the Cambrian explosion. The Avalon explosion appears similar to the Cambrian explosion in the rapid increase in  diversity of morphologies in a relatively small time frame, followed by diversification within the established body plans, a pattern similar to that observed in other evolutionary events. History. The Avalon explosion was proposed in 2008 by Virginia Tech paleontologists after analysis of the morphological space change in several Ediacaran assemblages. The discovery suggests that the early evolution of animals may have involved more than one explosive event. The original analysis has been the subject of dispute in the literature.