EESA06H3 Chapter 19: Chapter 19 notes

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14 Apr 2011
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james hutton is regarded as the father of modern geology. dating based on radioactivity allows us to determine a rock"s numerical age, also called absolute age. relative time is the sequence in which events took place. contacts are the surfaces separating two different rock types or rocks of different ages. formations are bodies of rocks of considerable thickness with recognizable characteristics that make each distinguishable from adjacent rock units: named after local geographic features. regional metamorphism took place resulting in the schists of the lower part of the canyon. erosion followed and levelled the land surface. the lowermost of the currently horizontal layers of sedimentary rock was deposited. each of the layers progressively higher up the sequence formed. finally, the stream eroded its way through the rock, carving the grand canyon www. notesolution. com. The principle of inclusion states that fragments included in a host rock are older than the host rock.

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