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 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.

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 ...

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.

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 ...

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

For its first 2⅟₂ billion years, Earth’s atmosphere had no oxygen. Then, with the advent of organisms capable of photosynthesis, ... from the middle of the Silurian Period.

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 ...

The explosion of animal diversity really kicked off during the Cambrian period, about 540 million years ago. The first animals that lived on Earth roamed the seas. The oceans were ruled by jawless ...

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 ...