Interesting thing about fossils: Fossils don't just record evidence of ancient life, they also show us clues about what the environment was like when the fossil was made, or deposited.
Depositional Environments
The Second Day
On the second day the formless watery mass of the deep, which teemed with life created on the first day, was ordered. The ordering was to fulfill the requirement for a permanent separation of light and dark.On the second day the formless mass of the deep, which teemed with life created on the first day, was ordered. The ordering was to fulfill the requirement for a permanent separation of light and dark.