LOS ANGELES (CBS) — One of the world’s largest dinosaur exhibits is opening at the Natural History Museum.

“Dinosaur Hall” takes up 14,000 square feet and includes 300 fossils and 20 dinosaur skeletons.

A Tyrannosaurus Rex growth series includes skeletons of the youngest known baby, a child, and a recently discovered teenager known as “Thomas,” whose remains were found by a school teacher in Montana.

“Thomas” is one of the youngest, most preserved skeletons of its kind to be discovered.

“It is remarkable and it’s also very rewarding to get this process done,” curator Luis Chiappe told CBS2′s Kirk Hawkins.

The Dinosaur Hall opens to the public on July 16.