The Susa Hornfels are rocky cliffs with clear black and light-gray striations. The Hornfels are the result of the metamorphosis of layers of sandstone and shale which were deposited alternately, then indurated by heat from magma roughly 14,000,000 years ago. Here on the coast of Hagi, Nature has created a rare, monumental masterpiece. Such a large mass of Hornfels exists nowhere else in Japan.