GEOL 1 Lecture Notes - Lecture 12: Paleozoic, Proterozoic, Hadean
21 Sep 2020
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Time is a major question in many studies, want to know when things happened how old something is, what happened in what order: dating methods. When it came compared to other things (fish came before. T rex) qualitative, much easier and much cheaper. Dinosaurs went extinct after birds showed up but before . Placing a value on when (220 mya) quantitative, very. Dinosaurs went extinct 65 mya. difficult and high cost. The preserved remains or traces of organisms that once lived on. Find age of rock to find age of fossils. If you know how old each layer is, you know how old the fossils in each layer are. No place on earth has a continuous record of strata from all earth"s history. Strata contain gaps that represent missing time. 3 types, classified by comparing strata above and below the gap. Different classes of rock above and below (metamorphic top- sedimentary rock bottom) Aren"t depended on the type of rock.
