Radiometric dating error margin

_______________________________________________________________ Comment: 130,000 B. Therefore the theory of ancient Humans entering the Americas by crossing the Bering Straits, and then "By-passing" the FROZEN North American Continent, by Boat travel along the Coast, is totally out of the question.The only other "Reasonable" possibility is an ATLANTIC crossing, similar to how ancient Africans reached Australia by "Island Hopping" more than 60,000 years ago.Legend: Mesoamerica = Mexico and Central America Pre-Columbian = Before Christopher Columbus Amerindian = Indigenous Indians of North and South America Paleoindian/Paleoamerican = The original Black settlers of the Americas The discovery of a bird-like dinosaur in South America has paleontologists rethinking when, where and how one group of raptors evolved.The rooster-sized dinosaur is called Buitreraptor (bwee-tree-rap-tor) gonzalezorum.Since dromaeosaurs had only been found in places that used to be part of Laurasia, scientists figured that the beasts evolved into being after Pangea split.But the Buitreraptor fossil in South America, which dates back 90 million years and closely resembles fossils from the North, means one of two things: Either dromaeosaurs existed when Pangea was intact; or the newfound Buitreraptor and its northern look-alikes evolved separately yet with remarkably similar results.

Today's announcement of a well-preserved fossil represents the first definitive evidence that dromaeosaurs roamed South America as well.

Buitreraptor is related to Velociraptor, the presumed cunning killer made famous by Hollywood.

Both belong to a class of birdlike dinosaurs that ran swiftly on two legs and are called dromaeosaurs.

Here's why that's important: About 200 million years ago, Earth had just one giant land mass called Pangea.

Toward the end of the Jurassic period, it split in two.

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