This surprising hypothesis, published in Earth and Planetary Science Letters, stems from plate tectonic reconstructions for the Ordovician period noting the positions of 21 asteroid impact craters.

Researchers have proposed that Earth may have had a ring system 466 million years ago, during a period of intense meteorite bombardment known as the Ordovician impact spike. This finding ...

Emma Bernard, a curator of fossil fish at the Museum, says, 'Shark-like scales from the Late Ordovician have been found, but no teeth ... An extinction event at the end of the Devonian killed off at ...

Earth is the only planet we know of that has ... The first fossil record we have of fire comes from the Middle Ordovician period, billions of years later. In terms of fire, there is a sweet ...