Tomkins and his team reconstructed an unusual rise in the number of meteorite impacts known as the Ordovician impact spike, ...

Manitoba is well-known for its fossil record, including the fossil-filled, world-famous Ordovician-aged Tyndall Stone and the ...

If you were to look up from Earth some 466 million years ago, you might have seen a gleaming ring stretching across the sky, some scientists say.

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 ...

The Ordovician period, from which the fossil likely came from, lasted 45 million years, starting 488 million years ago and ending 443 million years ago.

The Ordovician: Life's second big bang. By James O'Donoghue. 11 June 2008 JUST over half a billion years ago, evolution hit a purple patch. In the space of a ...

The Ordovician Radiation, also called the Great Ordovician Biodiversification Event (GOBE), saw a quadrupling of diversity at the genus level (that's the category one step above species).

The Late Ordovician mass extinction, the oldest of all and the second most lethal, isn’t one of them. Though there is a standard explanation for this granddaddy of death — involving an ancient ice age ...

Toward the end of the Ordovician, Earth underwent widespread glaciation. That could have caused the shallow seas to disappear, which provided optimal conditions for a variety of organisms.

The Ordovician extinction — one of the "big five" in Earth's history — occurred around 450 million years ago when the population of marine species plummeted.