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an a priori approach in his work. This means that Lyell was pulling from a theoretical idea instead of pulling from empirical evidence to explain what was occurring in the geological world. One opponent of Principles of Geology that agreed with this point was Adam Sedgwick. This opposition from Sedgwick comes from his thinking that evidence is all that is needed to support an idea, and that the evidence of geologic events points to a catastrophic event.

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