2 types of relative dating

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Brongniart was the first to use fossils to date rock strata. For example, it is believed that during a particular episode the land surface was raised in one part of the world to form high plateaus and mountain ranges. The graptolite, placoderm, ammonite, ichthyosaur, and shark's tooth could possibly be used as index fossils since they are found in only one layer. Prehistoric man was impressed by the naturally sharp edges produced when a piece of obsidian was fractured, and hence, preferred the material in tool making.

What is Relative Dating? Very dangerous contamination is done, very often, by the growth of fungus and bacteria on the surface of the specimen which even when removed from the specimen may falsify its actual age. But there are certainly drawbacks.

Dating techniques - Inclusions of igneous rocksedit Multiple melt inclusions in an olivine crystal. This method has achieved fame within a short time largely because it provides chronology for the prehistoric cultures, when we do not have written records.