Is this dinosaur big? You bet Jurassic!

Actually, the world’s largest dinosaur — a Titanosaur of epic proportions whose cast-model skeleton was unveiled Thursday at the Museum of Natural History — is technically from the late Cretaceous period.

Regardless, jaws dropped among the crowd assembled to watch the 122-foot long, 20-foot-tall display, which replaced a comparatively puny Barosaurus on the fourth floor of the museum.

The giant, which weighed in at 70 tons — or roughly 10 African elephants — when it roamed the Patagonia region of Argentina 95 to 100 million years ago, is so big that its head and neck extend toward the museum’s elevator banks.

Fourth-grader Dillon Hoke was in awe of the humongous herbivore. whose name means “titanic lizard.”

“I gasped when I saw it. I said, ‘Oh. my God, it’s really big!’ ” the 10-year-old said.

Diego Pol, one of the paleontologists who excavated the behemoth in 2014, said a farmer alerted his team after finding bones on his ranch.

“We realized this was something big,” said Pol, who found 200 bones from six dinosaurs.