May the gods of Earth's ancient ocean know and understand what I've done.

The machines used bore through soil that once lined the bottoms of ancient oceans.

He used to travel to Earth just to browse around the planetary library or gaze upon the ancient oceans.

They lived in almost every ancient ocean, and their fossils are found on every continent.

There must have been some convection current in the ancient ocean that had swirled them all into this one place.

Had the entire planet been covered with an ancient ocean?

And, more important, had the ancient ocean ever developed life?

The soil of the natural reserve is basically limestone which was precipitated about 400 million years ago by an ancient ocean.

At that time, sand and volcanic debris settled into an ancient ocean.

If an ancient ocean existed, these features should exist within a narrow range.