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Man Inhabited America
When -Glaciers Retreated
An “atomic” calendar has indicated that man first lived in North America 10,000 years ago, shortly after the glaciers receded.
The calendar, based on a study of radioactive carbon which can be dated, was prepared by a team of Chicago scientists and described at a recent meeting of the National Academy of Sciences in session at General Electric’s new research laboratory.
Dr. Willard F. Libby of the University of Chicago, leader of the group that prepared the master calendar said it also showed that:
The first known human beings on North America lived in Oregon and Nevada, and man did not live on the east coast until 5000 years ago. In 4000 B.C. Egypt had a simple village and agricultural existence. By 3000 B.C. it had its first dynasty. Mexico was inhabited at least 7000 years ago. The famous pyramid of the sun near Mexico City was built about 300 B.C. The volcanic explosion which created Crater Lake, Oregon, occurred 6500 years ago.
These estimates are based on a study of radioactive carbon formed in the upper atmosphere by cosmic rays which have what scientists call a 5568-year halflife.
This means that in many years the substance loses half its radiaactivity. After some 25,000 years, only %a minute amount of radiothe
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