The ammonite extinction marks one of the most decisive turning points in the history of life on Earth, closing a chapter that had endured for over 300 million years. Understanding the circumstances of their demise offers critical insights into how life responds to extreme planetary stress.
Chicxulub Impact: Evidence Linking the Asteroid to Ammonite Extinction
Photosynthesis would have ground to a halt, collapsing the base of the marine food chain and eliminating the ammonites' primary food sources. This thin layer of sediment, found worldwide, is marked by an anomalously high concentration of the element iridium, which is rare on Earth's surface but common in asteroids.
These geochemical fingerprints provide undeniable evidence of a global catastrophe coinciding with the mass extinction. This initial violence was followed by a prolonged period of global darkness, known as an impact winter, caused by dust and soot thrown high into the atmosphere.
Chicxulub Impact Evidence for Ammonite Extinction
Geochemical Evidence from the K-Pg Boundary The precise timing of the event is locked into the geological record at the Cretaceous-Paleogene (K-Pg) boundary. Ammonites relied on calcification to build their intricate shells, a process highly sensitive to changes in ocean chemistry.
More About Ammonite extinction
Looking at Ammonite extinction from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on Ammonite extinction can make the topic easier to follow by connecting earlier points with a few simple takeaways.
