Old Rock Day is an opportunity to enjoy and appreciate old rocks and fossils. Perhaps you can start a rock collection. You can go in search of fossils. You can read about rocks or, if you choose, you can just play with old rocks. Not only geologists like rocks. In fact, I'm starting the year off with a display of rocks in the library and all the associated books. Below are some of the books from that display, but you could go further and look at fossil fuels as well. If you do, don't forget Molly Bang and Penny Chisolm's wonderful book Buried Sunlight.