Many eras of Earth’s history ended in severe biodiversity loss. About 443 million years ago, marine habitats shrank during the Ordovician-Silurian Extinction, removing roughly 85% of sea life. Near ...

an astrophysicist introduced the Silurian Hypothesis, the idea that an advanced civilization may have existed on Earth before humans.

Leeds Fans overjoyed after promotion In 2018, an astrophysicist introduced the Silurian Hypothesis, the idea that an advanced civilization may have existed on Earth before humans.

Terms of Service and Privacy Policy. While life on Earth does usually find a way, it is not without some intense past–and future–periods of mass death. Extinction ...

After 25 years of research, a 444-million-year-old inside-out fossil has finally been named. The fossil, which researchers at the University of Leicester have identified as a new species of ...

But trees didn’t yet exist during the Silurian period, so what exactly was this thing taking over the ancient supercontinent of Gondwana? That argument was never truly settled. Most scientists ...

Instead, the organism’s taxonomic placement is debated. Scientists hypothesize that Prototaxites dominated prehistoric Earth between 420 and 375 million years ago, during the Silurian and Devonian ...

One halcyon spring day in 1903, the 69-year-old anatomist and naturalist Dr. James Bell Pettigrew sat at the top of a sloping street on the outskirts of St. Andrews, Scotland, perched inside a ...