A dinosaur bone found about three months ago in Maryland is from a giant creature that lived 50-million years before the t-rex.

It’s a three-foot-long leg bone from an Acrocanthosaurus, a 38-foot long carnivore.

That’s according to the Prince George’s county Paleontologist.

Because fossils of other dinosaur species have been found at the site, it’s now classified as a “bone bed”.

That’s an exciting discovery for Paleontologists, because bone beds can provide a wealth of information about the animals and their environment.

The bones were found at “Dinosaur Park” where miners first discovered fossils in the 18-hundreds.