This event was not merely the loss of a curious fossil but a profound reset button for marine ecosystems, clearing the stage for the rise of modern ocean life. The Last Days of the Ammonite Reign Ammonites were thriving in the Late Cretaceous, diversifying into a stunning array of shapes and sizes that filled numerous ecological niches.
How Ocean Acidification Impacted Ammonite Shell Calcification Before Extinction
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. 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.
These coiled, shelled predators, relatives of today’s octopus and squid, dominated the Mesozoic seas with remarkable evolutionary success. 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.
How Ocean Acidification Affected Ammonite Shell Calcification Before Extinction
Understanding the circumstances of their demise offers critical insights into how life responds to extreme planetary stress. Their biology provides several compelling answers.
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.
