GEOL 1121K Chapter Notes - Chapter 1: Igneous Rock, Layer Cake, Unconformity
Document Summary
Chapter 1 - dating rocks, fossils, etc. geologic record - layers of rock stacked one atop the other fossils - any evidence of ancient life. Relative age dating - is the process of determining when something formed or happened in relation to other events. Absolute age dating is the process of determining when something formed or happened in exact units of time such as days, months, or years. Rock units (division of the geologic record) vs. Eonothem (largest) - eon of time (longest unit) ^^surfaces between any of these kinds of units are contacts. Geologists use six basic laws for determining relative age relationships among bodies of rock based on their physical relationships. Law of original horizontality sedimentary layers (strata) and lava flows were originally deposited as relatively horizontal sheets, like a layer cake. If they are no longer horizontal or flat, it is because they have been displaced by subsequent movements of.
