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No great extinction or burst of diversity separated the Cretaceous from the Jurassic Period that had preceded it. If there are no strong elements, some key feature are: flower plants diatoms in the oceans Perhaps the most important of these events, at least for terrestrial life, was the first appearance of the flowering plants, also called the ...


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Short answer, there isn't one. The J-K boundary does not have a well defined fingerprint or marker, because of this it is in flux with different studies constantly offering to tweek or redefine its date based on their own criteria. https://www.sciencedirect.com/science/article/pii/019566719190001S https://ui.adsabs.harvard.edu/abs/2017EGUGA..1912252L/...


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