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 ...

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

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 ...