Fish started becoming more widespread in the ... group-living animals that built coral-like structures. Ordovician reefs were also home to large sea lilies, relatives of sea stars.

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 at Keele University say these ...

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

Fish were now diversifying and extending their ... still positioned over the South Pole but the vast icecaps of the late Ordovician period melted almost to nothing. Sediments formed from massive ...

At least two mass extinction events in Earth's history were likely caused by the "devastating" effects of nearby supernova explosions, a new study ...

At least two mass extinction events in Earth's history were likely caused by the "devastating" effects of nearby supernova ...