According to this link, there was no grass during the Jurassic period. But studies show that this is not true. https://www.newscientist.com/article/dn8336-foss

According to this link, there was no grass during the Jurassic period. But studies show that this is not true. https://www.newscientist.com/article/dn8336-fossil-dung-reveals-dinosaurs-did-graze-grass/ https://www.newscientist.com/article/dn8336-fossil-dung-reve...