Question: Step 2 - Calculate the average for each bentonite unit. Since the bentonite is derived from volcanic ash, there is uranium in it that can

Step 2 - Calculate the average for each bentonite unit. Since the bentonite is derived from volcanic ash, there is uranium in it that can be dated. The ratios we see here are the Lead/Uranium fractions. The black line on the graph is the known age for each ratio. Bentonite 'e Bentonite 'f Bentonite '9 Bentonite 'i' 0.04762 0.04753 0.04729 0.04717 0.04758 0.04747 0.04726 0.04720 0.04767 0.04763 0.04735 0.04723 0.04753 0.04738 0.04732 0.04712 0.04745 0.04745 0.04724 0.04718 0.04772 0.04754 0.04728 0.04719 0.04751 0.04737 0.04714 0.04741 0.04759 Sample average Step 3 - Plot your average on the graph below. (See slide 22 for example) 04800 04795 04790 04785 04780 04775 04770 04765 04760 04755 04750 Lead-206/Uranium-238 04745 04740 04735 04730 04725 04720 04715 04710 04705 04700 1 4 297 798 299 300 301 Millions of Years Before Present B
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