Schooner Gulch State Beach near Mendocino, California is also known as Bowling Ball Beach. It took millions of years for these sedimentary spheres to take shape. A process called “concretion,” is responsible for the mineral cements binding grains of sand and stone into large boulder formations. As beautiful as this beach appears, it can be tricky and in some areas impossible to navigate. If you decide to visit Bowling Ball Beach this summer, watch those ankles.