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

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 ...

Oldest Horseshoe Crab Fossil Found, 445 Million Years Old Date: February 8, 2008 Source: Royal Ontario Museum Summary: Few modern animals are as deserving of the title "living fossil" as the lowly ...

Perhaps two of them, one 372 million years ago and another 445 million years ago, were ice ages. A new study, based on a ...