My uncle said to always check the creek bed after a big rain, and he was right
When I was a kid, my uncle, who was a big rockhound, told me the best time to hunt for agates was right after a heavy spring storm washed through the creek near our place in Oregon. I mostly forgot about it until this past April, after three days of solid rain. I went down to the usual spot and the water had moved so much gravel around. Right on top, clear as day, was a perfect little blue lace agate I'd walked past a dozen times before. What's the best piece of advice you've gotten for finding cool rocks?