I want to know the answer to the following question:
What caused the destruction of fern prairies and increasing shallows?
All the background I'm provided with is that "The Late Jurassic featured a massive extinction of sauropods and Ichthyosaurs due to the separation of Pangaea into Laurasia and Gondwana in an extinction known as the Jurassic-Cretaceous extinction.". Is that enough to answer the question?
Answer: no