Wednesday, November 21, 2012

How Do Scientists Date Ancient Things?

China hosts 20 million years of early Cretaceous era fossils, including amazingly detailed fossils of feathered dinosaurs, like the Sinosauropteryx, which sported short, bristle-like feathers. 

 

Love-hungry teenagers and archaeologists agree: dating is hard. But while the difficulties of single life may be intractable, the challenge of determining the age of prehistoric artifacts and fossils is greatly aided by measuring certain radioactive isotopes.

Until this century, relative dating was the only technique for identifying the age of a truly ancient object. By examining the object's relation to layers of deposits in the area, and by comparing the object to others found at the site, archaeologists can estimate when the object arrived at the site. Though still heavily used, relative dating is now augmented by several modern dating techniques.
  
For the rest of the story: http://www.lifeslittlemysteries.com/199-how-do-scientists-date-ancient-things.html

No comments:

Post a Comment

Related Posts Plugin for WordPress, Blogger...