The Silurian Hypothesis Suggests An Advanced Civilization Lived On Earth Before Humans. ... "This short time period raises the obvious question as to whether this could have happened before." ...

The fossils date between 436 and 439 million years ago, during an epoch known as the Silurian Period, in which Earth experienced some dramatic events (such as developing an ozone layer) ...

The Silurian hypothesis asks whether it might be possible to find evidence of a pre-human industrial civilization in Earth’s geologic record—even one that might have existed millions of years ago.

The Huge Extinctions We Are Just Now Discovering. Season 6 Episode 8 | 8m 58s Video has Closed Captions | CC. Graptolites show us how unpredictable the Silurian period really could be.

In Doctor Who, an alien species called the Silurians exists – technologically-advanced humanoid reptiles who lived long before humans, going into hiding and being basically undiscovered again ...

New fossils are revealing the earliest jawed vertebrates — a group that encompasses 99 percent of all living vertebrates on Earth, including humans.

But the giant insects really got going during the Devonian Period and Carboniferous Period more than 300 million years ago, when Earth hosted many more trees and plants that released oxygen. View ...

Nature - Ancient fish from the Silurian period provide evolutionary insights. Scarce evidence indicates that key evolutionary steps for jawed vertebrates occurred during or before the Silurian ...

The fossils date back to the Silurian period, an important era for life on earth from 443 million years ago to 419 million years ago.

The evolution of land plants took place about 430 million years ago during the Silurian Period, ... "Hopefully this previously unrecognised link between the Earth's interior and surface ...

In Doctor Who, an alien species called the Silurians exists – technologically-advanced humanoid reptiles who lived long before humans, going into hiding and being basically undiscovered again ...