They were passing over one of the oceans between the continental masses.

He wasn't flying in the eastern region of the main continental mass any Imore.

This would be the third ship he'd at- tacked on his flight to the lesser continental mass.

The assistant administrator for the eastern section of the main continental mass wasted no time with polite small talk.

Too bad there wasn't a continental mass along the equator that would be more temperate.

So over time the continental masses grow larger and larger.

Clouds, but no other pattern, no sign of a continental mass.

It might be that all continental mass was again joined in one supercontinent between roughly 600 and 550 million years ago.

Beginning about 200 million years ago, tectonic pressure forced the sea floor beneath the American continental mass.

Other bases in the continental mass have been posited as candidates for a replacement.