EESA06H3 Final: EESA06 Final Exam Ch19 Summary + 40 MCQ/T or F

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The principle of uniformitarianism, a fundamental concept of geology, states that the present is the key to the past. Relative time, or the sequence in which geologic events occur in an area, can be determined by applying the principles of original horizontality, superposition, lateral continuity, and cross- cutting relationships. Unconformities are buried erosion surfaces that help geologists determine the relative sequence of events in the geologic past. Beds above and below a disconformity are parallel, generally indicating less intense activity in the earth"s crust. An angular unconformity implies that folding or tilting of rocks took place before or around the time of erosion. A nonconformity implies deep erosion because metamorphic or plutonic rocks have been exposed and subsequently buried by younger rock. Rocks can be correlated by determining the physical continuity of rocks between the two areas (generally this works only for a short distance).

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