I was fascinated by the material provided for school teachers by the US Geological Society about dating rocks.

For a classroom activity they suggest:

Have your students look for evidence of date stamps and cornerstones on their walk home. Depending upon your area, there may be quite a few.

Duh!  Building stones may have date stamps but rocks do not. This suggested activity makes the point, if anyone is alert to see it, that the only reliable way of knowing the age of anything is by the historical method, which relies on eyewitnesses and a written record. That is what the Bible is and why the Bible is the only reliable way of knowing the age of the earth….

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