Geologic Time - Geologic Time In what order did things...

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Geologic Time 13/02/2008 13:58:00 In what order did things occur? Relative dating How long ago did a particular event happen Absolute dating Both used together Principles of Relative Dating Sediments start out flat…horizontally (Principle of original horizontality) o Not all sedimentary rocks are flat, what happened? Start out flat…then tilt them another way (plate tectonics) Younger stuff is on top of older stuff (superposition) Principle of cross-cutting relationships  o Younger features cut across older ones What can happen to rocks? Deposition Erosion Deformation
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Unformatted text preview: ← Angular unconformity. . if a layer of rock is pushed from both sides, it will fold like a carpet ← ← Absolute Dating • Layer counting o Tree Ring Dating o Layers in Ice Cores o Varves (layers of sediment in a lake) ← _____________________________________________________________ ← Geologic Time: Radiometric dating ← ← Radioisotope dating: • Carbon 14 is an example of an unstable atom o More ex…. o 238 Uranium (parent isotope) turns into 206 Pb (daughter isotope) o Thorium 232 o Potassium 40 13/02/2008 13:58:00 ← 13/02/2008 13:58:00 ←...
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