Roughly 445 million years ago, around 85 percent of all marine species disappeared in a geologic flash known as the Late Ordovician mass extinction.

The features are layers of limestone sedimentary rock in Sweden, China and Russia that contain 100 to 1,000 times more meteorite debris than normally seen and are 465.7 million years old.

An international team of scientists has reconstructed the Earth's climate belts of the late Ordovician Period, between 460 and 445 million years ago. The findings show that these ancient climate ...

Previous research has yet to determine the cause for either the late Devonian or Ordovician mass extinctions, which occurred 372 and 445 million years ago, respectively. The Ordovician extinction ...

Squids first appeared about 100 million years ago and quickly rose to become dominant predators in the ancient oceans, ...

These vertebrates are likely to be products of what is called the Great Ordovician Biodiversification Event (around 485 million to 445 million years ago) — a sequel to an episode of ...

Housing and Land Use NYCHA and PACT announce $445 million financial privatization of Manhattanville Houses After being slated for conversion over two years ago, Manhattanville Houses was financially ...

A few million years following the period of increased meteor strikes, about 445 million years ago, there was a dramatic decrease in Earth’s global temperatures known as the Hirnantian Age.

The first of the Big Five mass extinctions transpired about 445 million years ago, marking the boundary between the Ordovician and Silurian periods back when fish and land plants were still ...

A few million years following the period of increased meteor strikes, about 445 million years ago, there was a dramatic decrease in Earth’s global temperatures known as the Hirnantian Age.

A few million years following the period of increased meteor strikes, about 445 million years ago, there was a dramatic decrease in Earth’s global temperatures known as the Hirnantian Age.