At an extremely old site (greater than 500,000 years), such as the older levels at Olduvai Gorge, the best type of dating technique to use would be Potassium-Argon or Argon-Argon.

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Potassium-Argon (K-Ar) and Argon-Argon (Ar-Ar) dating techniques are ideal for dating volcanic materials at sites older than 500,000 years, such as those found in the older levels of Olduvai Gorge, because they can date materials millions of years old with a relatively high degree of accuracy.

At an Extremely Old Site (Greater Than 500,000 Years), Such