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Index fossils

Index fossils. Some fossils are typical at a particular time segment. Useful in identifying the relative age of the rock in which they occur. Help us to identify geologic time periods. Four characteristics: 1. Must be easily recognized - Unique 2. Widespread in occurrence

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Index fossils

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  1. Index fossils • Some fossils are typical at a particular time segment. • Useful in identifying the relative age of the rock in which they occur. Help us to identify geologic time periods. • Four characteristics: • 1. Must be easily recognized - Unique • 2. Widespread in occurrence • 3. Limited in time- existed for a brief period of time • 4. Abundant AUWB!!!! A______ u________ w_____ b______

  2. Eurypterid (Sea scorpion) of the Silurian Period

  3. Example Fossil Assemblage One • Oldest to Youngest: • Cephalopod- Ordivician • Blastoid – Mississippian • Echinoid – Cretaceous • Brachiopod – Pennsylvanian • Pelecypod – Quaternary • 2a) No, they are not in order • 2b) Periods missing – Silurian, Devonian, Permian, Triassic, Jurassic, Tertiary

  4. Repeat this for the remaining 3 assemblages and answer analysis and conclusion questions

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