Paleozoic
Paleozoic era

In the Paleozoic era, 300-400 million years ago, the area was covered by a sea.

The state was mostly covered by a shallow sea during the majority of the Paleozoic era.

It is composed of rocks from the Paleozoic era (250-500 million years old).

This sea gradually retreated from the state before the end of the Paleozoic era.

It is the last period of the Paleozoic era, and ended in the largest mass extinction known to science.

More complex organisms came to inhabit the state during the early Paleozoic era.

The escarpment was formed 320 million years ago in the Paleozoic era.

Back to the Paleozoic Era, four hundred million and some odd years ago.

However, the swamps bearing these plants would dry up before the end of the Paleozoic era.

For example, the Paleozoic era, which stretched from roughly 600 to 230 million years ago, was the time of invertebrates.