GEOL 1003 Chapter : Chapter 6, Test 1
Document Summary
Chapter 6: correlation and dating of the rock record. Key problem with this assumption: radiometric dating, parent isotope/ daughter isotopes, emits alpha/ gamma particles, alpha particles, table 6-2: properties of some radioactive isotopes that are commonly used to date rocks, half-life, different isotopes have different half-life. You must pick the right system to date a rock. If you had a meteorite, which isotope would you use to date it: the oldest rock is 3. 9 billion years old. There is no physical evidence of rocks from before this time: we know the absolute age of earth because of radiometric dating, the exact duration of a period or era might change with refinement of dating techniques. Eustatic events: eustatic changes in sea level (eustatic falls or eustatic rises) **pertaining to worldwide changes in sea-level, as oppose to local change. What causes the eustatic changes in earth history: expansion and contraction of continental glaciers, approx.
