Instructions: This is an online, interactive exercise produced by geologists at Cal State-LA. You'll need a fairly up-to-date computer with a good internet connection. The exercise will probably take you about an hour to complete.

Assignment: Complete the Virtual Dating Isochron exercise - this is the one that deals with the Rb/Sr isotope system. If you want to, you may also choose to do the Virtual Dating Radiocarbon exercise. If you need help with these exercises try the Virtual Dating Demo first.

I'd welcome your feedback about these exercises.