Life at the start of the Ordovician remained confined to the seas with new animals evolving in place of those that didn't survive the Cambrian. Chief among them were the squidlike nautiloids ...

2. The relatively archaic animals of the Cambrian seafloor were replaced in the Late Cambrian and Ordovician by a great diversity of different fauna consisting of corals, brachiopods, cephalopods, ...

These animals can also be hard to find in the wild ... having been around in more or less the same form since the Ordovician period, some 445 million years ago. Back in those days, the continents ...

In the past 500 million years on Earth, there have been five mass extinctions. Here are a few incredible species that managed ...

The Paleozoic era's Silurian period saw animals and plants finally emerge on land. But first there was a period of biological regrouping following the disastrous climax to the Ordovician.

Late Ordovician Period - The Ordovician Period refers to the interval ... Mollusca, Pelecypoda ("clams, scallops, oysters, mussels") - Animals in the class pelecypoda are sluggish bottom-dwellers in ...

1. Silurian survivors of the Late Ordovician mass extinction were mostly cold-adapted animals from high latitudes or deep waters. 3. Silurian brachiopods included pentamerids (teardrop-shaped shells) ...

Conventional wisdom held that as worms and other animals burrowed in the sediment along the floors ... with a steep rise occurring during the Ordovician period. Back then, the world would have looked ...

“It’s really incredible to think how such small animals, ones that don’t even ... siliciclastic rocks from the Ediacaran ...

The world and its ecosystems have been around for a long time — so long that the first mass extinction occurred “just shy” of ...

Despite the huge abundance these diverse animals in our fossil records ... that dwelled at the bottom of the sea during the ...

"It coincides with the 'great Ordovician biodiversification event', when animals with hard skeletons were evolving rapidly," she said. "For the first time, we will be able to see what the rest of ...