Were where the first brachiosaurus bones found?

It is said that the Brontosaurus does not exist; paleontologist O.C. Marsh, who discovered the Brontosaurus in 1879 found a skeleton that did not have a head, so he used a skull that was found miles away to complete the skeleton. The skeleton O.C. Marsh had found was actually the skeleton of an Apatosaurus, which is a species he had already discovered and named two years earlier. So that being said, there was no longer any dinosaur named Brontosaurus.