Age dating formula
Pretty obvious that the dike came after the rocks it cuts through, right?
There are two basic approaches: relative age dating, and absolute age dating.
I also like this simple exercise, a spin-off from an activity described on the USGS site above.
Take students on a neighborhood walk and see what you can observe about age dates around you.
Calculate the age based on the Date of Birth and another date (default is the current date).
Dates should be entered in the US format mm/dd/yyyy, using four digits for the year.