Where was the brontosaurus habitat?

Brontosaurus is actually an invalid name for Apatosaurus Excelsus. Apatosaurus fossils come from the Morrison Formation of western North America and date to between 154 and 150 million years ago. 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.