A 10-year-old girl found 220-million-year-old dinosaur footprints on the beach

The Joneses live about an hour from the beach near Penarth in South Wales, which is known for being rich in fossils from the Jurassic period, around 200 to 145 million years ago.

They knew a set of dinosaur prints had previously been found nearby, so the pair decided to look for them. That's when they discovered the new tracks.

Online pictures of previously found dino tracks were in grayish rocks. But the Joneses' photos of the new-found tracks were in red rocks. That's when they realized they might have found something new.

Claire emailed the National Museum Wales. Later, Cindy Howells, the museum's curator of paleontology, joined the Joneses at the site to confirm their find and determine what type of dinosaur the prints belonged to.

While it's difficult to be sure, Howells thinks a Camelotia dinosaur may have left the prints. Bones belonging to these long-necked herbivores from around the same time period have turned up in southwest England, and Howells suspects the species lived in this region, too.

Moreover, the prints are spaced apart by about 30 inches, which would have required a fairly large stride, and Camelotia could reach nearly 10 feet tall and 20 feet long.

That said, many dinosaur tracks have the same size and shape. "Unless you find actual fossil bones at the end of a trackway you can never be sure" which dinosaur made them, Howells said.

The Joneses are the first to see these prints in over 140 years, Howells said.

Geologists in the late 19th century published a paper on a series of tracks in a similar location, which Howells suspects was the same set that the Joneses came upon.

"No one has seen them since," Howells said via email.

"These footprints are actually quite rare," Howells said. Dinosaurs made lots of footprints but only some are still recognizable.

The footprints needed to be made in damp mud then dried and baked in the sun before being covered again, she said.

If the mud is too wet or dry, or too deep, the resulting footprints might not be clear enough to identify. Other tracks were obliterated soon after they were created.

It wasn't just Howells who was excited by Tegan's rediscovery of the prints. An episode of the BBC show "Our Lives" featured the family and their discovery.

"It has been very surreal, amazing, and unbelievable," Claire Jones said about the whole experience.

Howells said she and her colleagues will potentially write a paper on the finding to document the prints' existence.