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

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

In this country, in Devonshire and Cornwall, the occurrence of radiolarian cherts, both of Ordovician and Carboniferous ... l several groups of Mollusca and Brachiopoda, as weH as with Echinodermata.

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

This era of intense bombardment, known as the Ordovician impact spike, may have resulted from meteorites falling from the ring rather than flying in from space, which would explain the strange ...

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The authors present 16 new well-preserved specimens from the early Cambrian Chengjiang biota. These specimens potentially represent a new taxon which could be useful in sorting out the problematic ...

Paleozoic fold and thrust belt in South Africa From Wikipedia, the free encyclopedia The mountains, although only of moderate height, are majestic and dramatic. This is due in part to numerous ...