Radiogenic dating definition

For a fossil to be a good index fossil, it needs to have lived during one specific time period, be easy to identify and have been abundant and found in many places. If you find ammonites in a rock in the South Island and also in a rock in the North Island, you can say that both rocks are Mesozoic.Different species of ammonites lived at different times within the Mesozoic, so identifying a fossil species can help narrow down when a rock was formed.

Sedimentary rocks can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 50 thousand years.Find additional lessons, activities, videos, and articles that focus on relative and absolute dating.Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence.Again, please keep their identity a secret Click on the "Continue" button search with your zip/postal code.Of all the isotopic dating methods in use today, the uranium-lead method is the oldest and, when done carefully, the most reliable.

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