Suppose that the upper ash layer in Figure 5.21 formed 1.7 million years ago and the low...

Suppose that the upper ash layer in Figure 5.21 formed 1.7 million years ago and the lower one is 1.9 million years old. What was the average sedimentation rate in cm/yr for the interval between the ash beds for the column on the right? Do you think your calculated average is accurate for the actual rate of sedimentation? Explain.