• Carbon-14 dating is very useful for ruins that contain wood.
  • Carbon-14 is useful for relatively young, carbon-based materials.
  • Other longer-lived isotopes are good for older rocks and minerals.
  • Different isotope pairs are useful for certain materials of certain ages.
  • It is not useful for determining the age of sedimentary rocks.
  • For this, geologists date a nearby igneous rock.
  • Then they use relative dating techniques to figure out the age.
  • They may not get it exactly, but there will be some idea.
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