The Late Ordovician period, ending 444 million years ago, was marked by the onset of glaciations. The expansion of non-vascular land plants accelerated chemical weathering and may have drawn down ...

The End-Ordovician Extinction was the first of the so-called ‘Big Five’ mass extinctions in the history of life on Earth - more than 80% of species in the oceans died out. But could you ...

Then 470 million years ago, near the end of the Early Ordovician Period, New York's land was in an ocean. Present-day New York City lay just off the coast of a small island 470 million years ago.

The researchers' idea that Earth once had rings comes from reconstructions of Earth's plate tectonics from the Ordovician period —which ran between 485.4 million years and 443.8 million years ...

A recent study claims that Earth may have once had a ring. The theory would explain the presence of an odd density of impact craters around the equator dating back to the Ordovician period. A ring ...

From the beginning of the Ordovician, marine life began its great radiation outward, which was characterized by the rapid appearance of new orders, families, and genera, together with the ...

Fossils from the Cincinnati area are renowned for their abundance, variety and ease of collecting. The animals that produced those fossils lived at the end of the Ordovician Period 450 million ...

How long did the Ordovician period last, and what caused the Ordovician mass extinction to wipe out 85 percent of life on earth 445 million years ago?