Stegosaurus lived between 155 and 150 million years ago during the late Jurassic period. At this point, flowering plants hadn't evolved yet. Contemporary plants include conifers, cycads, ginkgoes, ferns, horsetails, and mosses.
ferns and leaves
what type of plants existed at the same time the tyranosorus rex did
having lived or existed for only a short time:
what type of plant existed at the same time the parasaurolophus did
what type of plants existed at the same time the tyranosorus rex did
The Late Jurassic.
TTFITF
Stegosaurus existed from about 155 to 150 million years ago. That was during the Kimmeridgian and Tithonian stages of the Jurassic period. The Jurassic was the second of the three periods in the Mesozoic era.
There were Dino's such as camptosaurs and stegosaurs
grass
No. Primitive algae existed but true plants did not. There was no life on land in the Cambrian.
The official definition for the word youngest is "having lived or existed for only a short time."