Their reign began in the Devonian period and lasted through the Jurassic and Cretaceous, creating a fossil record so rich they became iconic markers for geological time. Why Ammonites Were Especially Vulnerable While the K-Pg event was a global catastrophe, the reasons ammonites were hit so much harder than their distant cousins, the nautilus, lie in their specific biology and life history.
Why Did Ammonites Planktonic Larvae Perish Under Impact Winter Conditions
Ammonites, which relied on building and maintaining their intricate calcium carbonate shells, would have been exceptionally vulnerable to this acidification. Ammonites released vast numbers of tiny, free-floating larvae called "aptychi" into the water column.
Their mode of reproduction and development played a critical role. The initial blast wave and global wildfires would have been followed by a prolonged period of "impact winter.
Why Planktonic Larvae Perished in the Impact Winter
The sudden disappearance of the ammonites, those magnificent coiled shells that ruled the Mesozoic seas for over 300 million years, has long captivated scientists and enthusiasts alike. The impact would have unleashed an energy release far beyond any human-made explosion, hurling vast amounts of debris into the atmosphere and causing immediate, catastrophic devastation at the impact site.
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