The YouTuber, who has found hundreds of tiny shark teeth and several whale skulls, began posting videos on his channel Mamlambo Fossils two years ago.
Researchers estimate that the species could have reached 25-40 meters (82-131 feet) in length.
The boy and his family were vacationing on a South Carolina beach when the huge fossil was uncovered.
The paleontologists who made the find believe that it could take years to exhume the remains completely.
Hundreds of specimens have been recovered so far, including a practically intact set of mastodon tusks.
Because we also had sediment that the fossil was found in, we were able to use chemicals to date the sediment and determine that this dinosaur is from the later Crustacean Period and is roughly 70 million years old.
Megalodon was the largest shark ever to have lived, potentially growing up to around 60 feet in length.
Researchers have discovered the fossilized remains of at least 40 different species of ancient shark in Mammoth Cave in Kentucky, dating back to around 325 million years ago.
The predation event took place 99 million years ago in what is now Myanmar.
"Diagnosis of aggressive cancer like this in dinosaurs has been elusive," said researcher Mark Crowther.
The fossilized excrement could help to shed light on what the extinct animal once ate.
Researchers also found another news species of prehistoric shark in Georgia.
The reptile is an early member of the animal group Ornithodira to which both dinosaurs and pterosaurs belong.
Latest study supports the idea that the asteroid impact 66 million years ago was the main driver of dinosaur extinction, not intense volcanic activity as some have suggested.
Many giant dinosaur specimens are very incomplete, which makes it difficult to produce reliable body mass estimates.
The latest findings also help to shed new light on other sites in South Korea where scientists have previously found footprints that were originally thought to belong to giant flying reptiles.
"The finding of the actual preserved stomach contents from a dinosaur is extraordinarily rare," said researcher Jim Basinger.
The dinosaur is one of the largest and youngest megaraptors on the fossil record, say paleontologists.
Scientists describe the two-inch bone of a 110 million-year-old elaphrosaur found in Victoria, Australia, after it was misidentified as belonging to a pterosaur.
The shape of the structures resemble that of complex carbon molecules known as "fullerenes," which were one of the first nanoparticles discovered by scientists.
Bones from a fossil rich site at Tanque Loma in Ecuador offers clues to how a group of 22 plus giant sloths met their end 18,000 years ago.
A new Spinosaurus skeleton proves one of the largest dinosaur predators ever discovered lived a largely aquatic lifestyle, opening up a new understanding of dinosaur's place in the ancient world and overturning old dogmas.
Researchers reviewed a group of fossils from an area of the Moroccan Sahara, which includes a host of large dinosaurs, pterosaurs, crocodilians, and other animals.
A recently published paper describes some of the oldest plants and animals in Australia and Zealandia, aged between 40 and 230 million years old.
Scientists say the young Homo naledi was between 8-15 years old. Further research could determine whether the species was more ape-like or human-like in its maturation.
The extinct animal may reveal how modern birds survived the asteroid that wiped out large dinosaurs.
"[The discovery] shows that some of the big steps in evolution we thought were restricted to land animals actually first took place in fishes," said researcher John Long.
Researchers have found around 50 footprints at two sites on the island.
Information stored by a geologist's daughter contained data that helped determine the makers of a series of dinosaur tracks found on a cave ceiling in Australia.
The animal is one of the oldest tyrannosaur species ever discovered in North America.