| |  | Last lecture focused on what fossils are and how the thinking on them evolved through time. | 
 |  | This lecture looks at how fossils form and their limitations. | 
 |  | Fossils are formed through a series of geologic and biologic processes. | 
 |  | Each step in the process, destroys some data on the original organism. | 
 |  | As a result of these processes, The fossil record is a biased sample of past life. | 
 | The process of fossilization | 
 | Biases in the fossil record | 
 
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