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					| Relative Time |  
					| Lecture 5 2/11/98
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					| |  | On Monday, we looked at the geologic principles that form the basis of our understanding of the rock record | 
 |  | Today, we will look at how these principles were used to develop the Geologic Time scale | 
 |  | The Geologic Time scale provides a relative measure of time. | 
 |  | The Geologic Time scale is based on the fossil record | 
 | Subdivisions of the Cryptozoic | 
 | Subdivisions of the Phanerozoic | 
 
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