PCB 4674C Lecture Notes - Lecture 15: Layer Cake, Absolute Time And Space, Catastrophism

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31 Dec 2019
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Remember that much of darwin"s scientific research on the beagle was geological: for example, his discoveries from geology in south america led to reexamining his position on the fixity of species. Darwin"s gradualist tendencies and also grew from geological studies and an increasing awareness of the great depth of geological time. The age of the earth figured prominently in arguments about evolution and evolutionary processes, and the fossil record also figured prominently in arguments about evolution. There are two relevant types of geological time, relative time, that is x is older than y and younger than z, or absolute time, this is x years old. In the days before methods were developed to determine absolute ages over a variety of time scales, relative ages were the best that could be determined. This led to studies of stratigraphy - the layering of rocks. Gravity dictates that superposition will occur - the youngest rocks are on top (at least for sedimentary rocks).

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