How many types of dinosaurs where there?
There were many types of dinosaurs, too many to name. But there are over 650,000,000 types.
Yes there is evidence of Mesozoic dinosaurs in the form of fossilised bones of hundreds of clades, ranging from embryos to adult, eggs, coprolites and trackways. There are dinosaurs living today, the birds which are theropod dinosaurs. There is overwhelming evidence that birds derived from dinosaurs. There are now many fossils that show many types dinosaurs had feathers.
Yes, many types of dinosaurs lived in Montana. Dinosaurs from Montana at the end of the Cretaceous include Tyrannosaurus, Triceratops, Edmontosaurus, and others. Dinosaurs that lived there during the late Jurassic include Apatosaurus, Diplodocus, Camarasaurus, Stegosaurus, Allosaurus, Torvosaurus, and Ceratosaurus.