Among the few known fossils from this general time period are trilobites preserved in metamorphic rocks deposited in that same Paleozoic sea.

These ancient mountains may be the only area in the American Midwest never to have been submerged, existing as an island archipelago in the Paleozoic seas.

Inhabitants of Georgia's early Paleozoic sea included corals, stromatolites, and trilobites.

The core of the range existed as an island in the Paleozoic seas.

The Paleozoic sea covering Indiana remained in place during the Silurian Period.

The structures bearing this name were typically made on the tidal flats of Paleozoic seas, but similar ones extend into the Cenozoic.

He went on to explain that this buried mountain range seems to be an island "in the Paleozoic sea, while sediments piled around it."

The state's Paleozoic seas would come to be home to creatures like brachiopods, fishes, and trilobites.

It was one of the top predators in the Paleozoic seas.

Midwestern limestone was deposited by Paleozoic seas.