Where do stegosaurus live?

Stegosaurus fossils come from the Morrison Formation in the western USA and date to between 155 and 150 million years ago. Some have recently been found in Portugal from the same time period, so they probably lived throughout North America and much of Europe. At that time, the area was a semi-arid subtropical plain with distinct wet and dry seasons. Near rivers, there were forests of conifers, cycads, ginkgoes, ferns, and horsetails. Further from the rivers there were open areas covered in ferns with scattered trees. It is believed that Stegosaurus preferred the drier fern fields.