In place of oxygen, the ocean was full of hydrogen sulfide, which the researchers believe may have caused the organism to ...

Ordovician reefs were also home to large sea ... they collected food particles with feathery arms that waved in the ocean currents. The hard-bodied arthropods started eyeing opportunities on ...

Specifically, the findings support the hypothesis that supernovae could have triggered two of the so-called "big five" mass ...

However, in the Ordovician, the creatures were invertebrates, or organisms lacking a backbone, such as brachiopods, trilobites, and corals. These organisms were perfectly suited to survive in the warm ...

At least two mass extinction events in Earth's history were likely caused by the 'devastating' effects of nearby supernova explosions, a new study suggests. Researchers say these super-powerful blasts ...

Most people know the theory that an asteroid smashed into Earth — hitting what is now the Yucatán Peninsula — and killed off many of the dinosaurs about 66 million years ago. But that was not the only ...

New research suggests that powerful star explosions, called supernovae, may have caused at least two mass extinctions in ...

Sharks have been around for hundreds of millions of years, appearing in the fossil record before trees even existed. But what did they evolve from, are they ‘living fossils’, and how did they survive ...

The Ordovician event is believed to have wiped out about 60% of invertebrate sea creatures when most life was in the ocean. The late Devonian extinction eliminated 70% of species, reshaping marine ...

But first there was a period of biological regrouping following the disastrous climax to the Ordovician. The recovery soon got under way in the oceans as climbing temperatures and rising sea ...