Furthermore, their planktonic larvae, which drift in the surface ocean, would have been directly exposed to the lethal environmental shifts that devastated the upper layers of the sea. 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.
Fossil Record Gaps: Tracing Ammonite Evolution Amid Extinction Mysteries
From the common, small-shelled forms to the massive, elaborately coiled specimens, they were a dominant component of the marine food web. Their sudden disappearance at the end of the Cretaceous period, alongside the non-avian dinosaurs, has long fascinated scientists and the public alike.
These coiled, shelled predators, relatives of today’s octopus and squid, dominated the Mesozoic seas with remarkable evolutionary success. The acidification of the oceans following the impact would have dissolved their shells and made it nearly impossible for juveniles to form new armor.
Fossil Record Gaps in Ammonite Evolution: Tracing the Hidden Transitions
Contributing Factor Impact on Ammonites Impact Winter Blocked sunlight, collapsing photosynthesis and food chains Acid Rain Ocean acidification harmed shell-forming organisms and vulnerable life stages Thermal Pulse Instantaneous burning and habitat destruction in coastal zones Long-term Climate Change Disruption of ocean currents and temperature regulation Why Ammonites Were Especially Vulnerable While many species perished, some organisms survived the K-Pg extinction, raising the question of why ammonites were not among them. 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.
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.
