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.
So perhaps there was a sudden increase 2.3 billion years ago in the amount of organic carbon that was buried, leaving more free oxygen. But thereâs a glitch: Studies have shown that the amount of buried carbon found in sedimentary rocks remained constant during the early stages of the Great Oxidation Event.