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  It is interesting to speculate that prior to the final phase of the early global glaciation around the 635 million years mark, the most complex form of life is believed to have been eukaryotic cells. Yet forward a 100 million and we have one of our first complex life fossil assemblages, that of the Russian 'small shelly' Tommotian fauna.
  
  One wonders if the melting of the iceball and oxygenation of the waters led to a springboard of evolutionary innovation and the emergence of multicellular life. Our early fossil assemblages are just snapshots, sparce and rare. But it is clear that by the time of the mid Cambrian, the basic body plans of the current lineages of multicellular organisms were set and basically familiar to us today.

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