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 and the Fifth Day of Creation. The relationship between the Great Unconformity and the Cambrian explosion also explains why God waited until the fifth creation day, after the emergence of the continents (day three), to create animals in the seas. Complex, advanced animal life in the sea could not exist until continents formed.