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 ...

The Ordovician endoceratids cephalopods were ... all cephalopods had been members of the slow and steady group known as nautiloids, from the pioneering little Plectronoceras to the imposing ...

However, the Ordovician witnessed the rise of two other large predators, equal to or surpassing anomalocaridids in size — eurypterids, or sea scorpions, and nautiloids, which resembled squid ...

After the Ordovician Period came the Silurian Period ... providing shelter for fish and shelled creatures, such as nautiloids and ammonoids. Modern conifers and ginkgo trees evolved on land.

Roughly 85 percent of all species disappeared during the end-Ordovician crisis ... scientists also identified a few conical-shelled nautiloids and one sea scorpion. "We think the sponges thrived ...

This unprecedented die-off is now known as the earth’s first mass extinction, the Late Ordovician mass extinction or simply LOME. Many researchers have devoted time, or even careers, to uncovering the ...

It came during the Ordovician period, right after the Cambrian came to a close 485 million years ago. The Ordovician Radiation, also called the Great Ordovician Biodiversification Event (GOBE ...

In contrast, exceptional preservation is rare in Ordovician strata: the few previously reported examples 5,6,7,8 are low diversity assemblages from environmentally restricted settings and do not ...

It came in the form of a second explosion of life called the Great Ordovician Biodiversification Event, a little-heard-of episode which has been the focus of intense scientific interest in recent ...

One of those mollusks, a straight-shelled nautiloid, died and drifted to the ... similar sites from the following Ordovician period are much rarer, Dr. Nanglu said. Even sites like Fezouata ...