Long before whales and sharks, enormous marine reptiles dominated the oceans with unmatched power. Scientists have reconstructed a 130-million-year-old marine ecosystem from Colombia and found ...

Squids first appeared about 100 million years ago and quickly rose to become dominant predators in the ancient oceans, according to a study published in the journal Science. A team of researchers from ...

The eastern tropical Pacific Ocean is known for its large low-oxygen zones that are increasing in size, putting marine life at risk. New research shows that 15 million years ago, the opposite was true ...

Scientists studying ancient ocean fossils found that the Arabian Sea was better oxygenated 16 million years ago, even though the planet was warmer than today. Oxygen levels only plunged millions of ...

At the time of the dinosaurs, the oceans were teeming with life. Below the waves, giant marine reptiles, such as the fearsome 4m (13ft) long mosasaurs, were the undisputed apex predators. In artistic ...

Add Yahoo as a preferred source to see more of our stories on Google. Alaska rock records show ocean deoxygenation began nearly 8 million years before the end-Triassic mass extinction. (CREDIT: ...

The end-Triassic extinction is often overshadowed by the disaster that killed the dinosaurs, but on its own it ranks among the worst biological crises in Earth’s history. Around 201 million years ago, ...