Petrology, v 45, no. 4, pp. 907 -925. Four hundred and fifty (450) million years ago, during the Late Ordovician, most of Ohio was under water. At that time, the Oxford, Ohio area was part of a large ...

Ordovician reefs were also home to large sea lilies, relatives of sea stars. Anchored to the bottom inside calcareous tubes, they collected food particles with feathery arms that waved in the ...

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

The pieces commonly found in Southwestern Ohio were formed about 450 million years ago during the Late Ordovician Period, when a warm shallow sea covered much of North America. Shale typically formed ...

A supernova — the explosive death of a massive star — can leave behind a black hole or neutron star. These cosmic blasts are ...

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 ...

As part of this, the research team calculated the supernova rate within 20 parsecs of the Sun, or approximately 65 ...