Vertebrates of the Late Devonian
The Late Devonian is a crucial time for vertebrate evolution. The Devonian is often referred to as “The Age of Fish” because of the enormous boom in marine fish evolution that took place during this period. This area is also highly subdivided by different conodont biozones (see biochronology). These tiny marine vertebrates are the earliest spinal cord bearing organisms known at the present time and are identified by their teeth. Other vertebrates include a variety of sharks, reptiles, amphibians, and those animals that first made the transition from sea to land.