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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
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______

example fossil assemblage one
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