Arizona RiverPea Gravel Arizona quarry shipping bulk through California and the Reno Metro area. Pallets baskets are available everywhere. Arizona River Rock is known for its smooth round profile, it has very smooth edges and surfaces, evoking an image of stones worn by centuries of cascading water. Arizona River Rock is a multi-color blend of mauve, plum, burgundy, and lavender-colored stones with random splashes of black, terracotta, and green. This rock is also called Salt River Rock Cobbles and Pebbles, which is a generic term for river rock from Arizona.