Radioactive dating volcanic ash dating paiste cymbals
Like the other kind of dating, geologic dating isn’t always simple.
What’s more, if the whole rock is badly weathered, it will be hard to find an intact mineral grain containing radioactive isotopes.
You might have noticed that many of the oldest age dates come from a mineral called zircon.
Absolute dating is necessary for knowing specific time e.g.
by isotope K/Ar in mica, especially in the crystalline rock: igneous and metamorphic rock.
Unlike people, you can’t really guess the age of a rock from looking at it.