While Monument Valley’s buttes and mesas can reach up to 1,000 feet (300 meters) above the valley floor ... the ocean was ever present — and if life could have existed within it. The mounds ...

A “large”-eyed sea creature swam along the ocean floor off the coast of West Africa ... several months in 2010 surveying deep-sea coral mounds off the coast of Mauritania, according to ...

In the 1960s, the U.S. Navy was exploring the other "final frontier" -- the sea. A series of underwater habitats called "Sealabs" were constructed for scientific exploration on the ocean floor.

"It's possible that this might have come from an ancient northern ocean on Mars." Thousands of hills and mounds on Mars have been found to contain layers of clay minerals, which formed when ...

They are a prime location for future missions aimed at uncovering whether Mars ever had an ocean and whether life could have existed there." The study also reveals that the mounds are geologically ...

They are a prime location for future missions aimed at uncovering whether Mars ever had an ocean and whether life could have existed there." The study also reveals that the mounds are geologically ...

Now researchers led by McNeil have found further supporting evidence for a northern sea, in the form of more than 15,000 mounds and hills up to 1,640 feet (500 meters) tall that contain clay minerals.