"The water we use comes from underground rivers rising through the bed of an ancient sea."

All this oil once lay below the bed of an ancient sea.

From above, it was clear that they were following the coastline of an ancient sea.

Far below them, a pool of deep colour, they saw the ancient sea.

This shows that the depression of the region beneath an ancient sea took place after a long existence as dry land.

Layering, which was caused by a very ancient sea of water.

The chalk was deposited in the area by an ancient inland sea.

Today we are still often told that we have ancient seas in our blood.

So do we have ancient seas in our blood?

The ancient seas had many more kinds of animals in them than we can ever know.