Friday, June 1, 2012

Index Fossils and Facies Fossils

Index Fossils

When a particular prehistoric creature only thrives in a particular era, it's fossil canbe used to deduce the soil's geological era. For instance,  if we uncover a fossil  of an ammonites in a layer ground, we can determine that layer existed as surface in the Mesozoic, as ammonites only lived during that era.  

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