"Now what you have to imagine is that 300 million years ago Indiana was covered by this vast tropical sea," he goes on.

It is also found in shallow tropical seas off the west coast of Africa.

They were mostly laid down in tropical seas 205 to 142 million years ago.

They are found in all the world's oceans, from the cold of the Arctic to the tropical seas.

It grows in all the tropical seas of the world.

They are found in temperate and tropical seas all around the world.

It was not like swimming in a tropical sea.

It is found around the world in tropical and subtropical seas.

It was abundant in tropical seas, and may have had a global distribution.

The history of the area began 550 million years ago beneath a tropical sea.