Mesoproterozoic

The Mesoproterozoic is a geologic era which lasted from 1,600 million years ago (mya) to 1,000 mya.
The major events of this era are: 
Evidence of a eukaryotic red algae, "Bangiomorpha pubescens", has been identified from ~1200 mya old rocks in the Hunting Formation (Somerset Island, Canada). This is the oldest known sexually reproducing organism and therefore the earliest known complex multicellular organism.