That includes the date from the Cinmar mastodon." Mizzou scholars, including O'Brien's postdoctoral student, Metin Eren, and graduate student Matthew Boulanger, point to the lack of first-hand accounts from the crew of the Cinmar who recovered the blade and mastodon remains.All published accounts were first written by proponents of the Solutrean hypothesis.The study, "The Cinmar discovery and the proposed pre-Late Glacial Maximum occupation of North America," recently was published in the Journal of Archaeological Science: Reports. Dazu gibt es dann unsere Vorbereitungskurse für die Platzreife. Bronk Ramsey’s team aimed to fill this gap by using sediment from bed of Lake Suigetsu, west of Tokyo.Two distinct sediment layers have formed in the lake every summer and winter over tens of thousands of years.One piece of evidence that advocates of the ice bridge theory rely on comes from the Chesapeake Bay.In the early 1970s, the crew of a scallop trawling vessel, Cinmar, was operating off the coast of Virginia when it hit a snag and pulled up an ancient stone blade, along with pieces of a mastodon skeleton.
The technique hinges on carbon-14, a radioactive isotope of the element that, unlike other more stable forms of carbon, decays away at a steady rate.
Since the 1960s, scientists have started accounting for the variations by calibrating the clock against the known ages of tree rings.
As a rule, carbon dates are younger than calendar dates: a bone carbon-dated to 10,000 years is around 11,000 years old, and 20,000 carbon years roughly equates to 24,000 calendar years.
Wir bieten verschiedene 3-Tages-Golf-Schnupperkurse an. Melden Sie sich an und schon sind Sie vom Virus angesteckt.
Climate records from a Japanese lake are set to improve the accuracy of the dating technique, which could help to shed light on archaeological mysteries such as why Neanderthals became extinct.
The problem, says Bronk Ramsey, is that tree rings provide a direct record that only goes as far back as about 14,000 years.