A vast floodplain was drowned by rising seas 227 million years ago and this may have created the ecological conditions for dinosaurs to become more common
Source:
https://www.newscientist.com/article/2246210-rising-sea-levels-may-have-helped-dinosaurs-dominate-the-planet/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home