The earliest fossil evidence for sharks or their ancestors are a few scales dating to 450 million years ago, during the Late Ordovician Period. “Shark-like scales from the Late Ordovician have been ...

Spectacular Moroccan fossils redefine evolutionary timelines. ScienceDaily . Retrieved May 27, 2025 from www.sciencedaily.com / releases / 2015 / 07 / 150707213241.htm ...

The planet’s first death knell sounded 444 million years ago, near the end of the Ordovician Period.* Simple forms of life — mainly bacteria and archaea — had already flourished for 3 billion years.

Fossil Content of Local Limestone. The fossil content of local limestone shows the diversity of life in the late Ordovician period. Bryozoans and brachiopods, nearly equal in abundance, form about 60% ...

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 ...

The Ordovician period came to a chaotic end with a major mass extinction event that rocked Earth, eliminating about 85 percent of all species. Cemented as one of the “ big five” mass extinctions in ...

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 ...

When the world-girdling ice came at the end of the Ordovician period roughly 440 million years ago, only a few species of graptolite survived the mass extinction. Graptolites, whose name means ...