Ordovician-Silurian extinction | Overview & Facts | Britannica

The 5 mass extinction events that shaped the history of Earth — and the 6th that's happening now

Devonian Period: Facts, Information, and Timeline

The Devonian Period: The Age of Armored Fish and Seven-Toed Tetrapods

Mass extinction facts and information from National Geographic

History | Ancient History on Instagram: "Earth’s history is marked by five major mass extinctions, each reshaping life in profound and often catastrophic ways. The Ordovician-Silurian extinction, around 445 million years ago, wiped out nearly 85% of marine species, likely triggered by a sudden ice age and falling sea levels. The Late Devonian extinction, roughly 375 million years ago, gradually eliminated many marine organisms, possibly due to widespread anoxia and climate changes. The Permian-T