Question: What is isotopic dating used for?

Radioactive dating is a method of dating rocks and minerals using radioactive isotopes. This method is useful for igneous and metamorphic rocks, which cannot be dated by the stratigraphic correlation method used for sedimentary rocks. Over 300 naturally-occurring isotopes are known.Radioactive dating is a method of dating rocks and minerals using radioactive isotopes

Which type of unconformity is the hardest to recognize?

The most difficult to recognize is the paraconformity where horizontal sedimentary rocks are above and below the contact—there can be scant visible evidence of a hiatus when identical rocks are above and below.

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