Logan is a name with Irish origins. The meaning of the name Logan is from the hollow. Common nicknames for Logan include Loag and Lo. Famous Loganâs include athletes Logan Bailly, Logan Coutre, Logan Kensing, and Logan Mankins.
During the Cambrian explosion, the atmospheric oxygen levels increased by up to 10 percent, and prior to that time the living creatures roaming the Earth were typically small, simple and often single-celled.
The Cambrian Explosion is a sudden appearance of all life as we know it. There are exceedingly few that come before this and those that follow the Cambrian show no differences than their ancestral cousins or predecessors that follow. It is like an explosion of life that appears almost instantaneously on earth. What is amazing about the Cambrian layer is what is not there before it and after it. In other words, you will find almost no predecessors or ancestors of the Cambrian creatures; that is, absolutely nothing above or below this layer.