They served as both voracious predators and essential prey, supporting a complex web of life that included mosasaurs, plesiosaurs, and countless fish species. This layer also contains the mineral shocked quartz, which forms under the immense pressures of an impact, and glassy spherules created from molten rock flung into the air.
Planktonic Larvae Sensitivity and the Devastating Extinction Timeline
Their sudden disappearance at the end of the Cretaceous period, alongside the non-avian dinosaurs, has long fascinated scientists and the public alike. 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. Ammonites relied on calcification to build their intricate shells, a process highly sensitive to changes in ocean chemistry.
Planktonic Larvae Sensitivity and the Devastating Environmental Shifts at the K-Pg Boundary
These coiled, shelled predators, relatives of today’s octopus and squid, dominated the Mesozoic seas with remarkable evolutionary success. Understanding the circumstances of their demise offers critical insights into how life responds to extreme planetary stress.
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.
