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.
Later life forms that appeared during the Cambrian Explosion include Arthropoda, Brachiopoda and Echinodermata. It is estimated that there was as much diversity of life in the oceans 542 million years ago as there is today. One of the most successful life forms during the Cambrian Explosion were trilobites.