Ripples are a geologic feature you can find in sedimentary rocks. They indicate the sediment that the rock is made of was deposited under a lake where the water was sloshing back and forth and back and forth going in two directions to make them symmetrical. In a river your ripples would be more shaped like a dune with a sharply sloping side and a gently sloping side indicating that water was moving in a single direction. #ripples #dunes #geology #didyouknow #naturoger #rocks #sedimentaryrocks #limestone