"Over millions of years, material from this ring gradually fell to Earth, creating the spike in meteorite impacts," said ...

The Earth: a ringed planet, much like Saturn, surrounded by a hula hoop of asteroids. The summit of Mount Everest: a tropical ...

However, in the Ordovician, the creatures were invertebrates, or organisms lacking a backbone, such as brachiopods, trilobites, and corals. These organisms were perfectly suited to survive in the warm ...

Though unfinished, Salter's monograph has thirty excellent plates which make it an essential starting point for the study of British Devonian, Silurian and Ordovician trilobites. The monograph is also ...

A huge 75-foot-tall square boulder deep in Wyoming’s Bighorn Mountains has been baffling people since it was discovered.

We study trilobites from four periods of the Palaeozoic: the Cambrian, Ordovician, Silurian and Devonian. Our research covers trilobite taxonomy, phylogeny, functional morphology, biogeography, and ...

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

Learn more about the time period that took place 488 to 443 million years ago. 3 min read During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the ...

Series: The Critical Moments and Perspectives in Earth History and Paleobiology Your institution does not have access to this book on JSTOR. Try searching on JSTOR ...

Trilobite - Trilobites (phylum Arthropoda ... There are several great nearby places to see geology for yourself, whether you're interested in collecting Late Ordovician fossils, exploring ...

Simple, single-celled algae would have made enough oxygen via photosynthesis to sustain trilobites, clamlike brachiopods ... All of that extra oxygen likely contributed to the Great Ordovician ...