The Ordovician Extinction | 100 Facts to Fall Asleep To

Imagine a world where sea levels plummet by a staggering 100 meters, exposing vast continental shelves to air and devastating the shallow, tropical seas where nearly all complex life thrived. This dramatic event, occurring approximately 443 million years ago, represents the first pulse of Earth's second-deadliest mass extinction. This 100-fact documentary delves into the catastrophic Ordovician extinction, exploring the two distinct extinction pulses that wiped out an estimated 85 percent of all marine species. We uncover how the supercontinent Gondwana's drift over the South Pole triggered the Hirnantian glaciation, leading to a global ice age and plummeting temperatures. Learn about the decimation of diverse trilobite families, including the complete extinction of the Agnostida order, and the severe losses suffered by graptolites and brachiopods. Discover how changing ocean circulation and the subsequent rise of oxygen-poor waters during the second pulse compounded the devastation at the boundary between the Ordovician and Silurian geologic periods. Designed for deep relaxation and focus, this video features slow, calm narration without any loud sounds or sudden edits. It's perfect for unwinding before sleep, providing a tranquil background for studying, or simply offering a peaceful soundscape for moments of calm. — Fossil Hour makes long-form documentaries meant to be slept through. New episodes weekly. Narration is AI-assisted. #sleep #sleepdocumentary #fallasleep #theordovicianextinction #bedtime #relaxing