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While not an official holiday, Old Rock Day celebrates fossils and all types of old rocks. That's right. Rocks.
Although it's origin is not known, one theory gives credit to the cartoon family, The Flintstones, but there is no evidence to support it.
Geologists, kids, and anyone so inclined can celebrate Old Rock Day by going out to look for interesting rocks; visiting a historic site that features rocks; reading books about rocks or fossils; starting a rock collection; or doing anything that involves appreciation of old rocks and fossils.
The main thing is to have fun learning how to appreciate and enjoy - rocks.
Photo: Old rock formations near Ghost Ranch in New Mexico.