how will you determine relative dating

Another example is a derived fossil , which is a fossil that has been eroded from an older bed and redeposited into a younger one. Source: Tes Teach with Blendspace. What is an isotope? These rock strata have been barely disturbed from their original deposition, except by a broad regional uplift. Because, the unknown fossil, the red sponge, was found with the fossils in fossil assemblage B it also must have existed during the interval of time indicated by the red box. Gradstein, F. During magnetic reversals, there are probably changes in convection in the Earth's core leading to changes in the magnetic field.

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