The Goishi Coast features striped strata formed by submarine deposits of mud and sand. Here, traces of intense orogenic activity (mountain-building) from early Cretaceous undersea volcanic eruptions are visible everywhere. The folds of Anatoshi-iso, the black shale of Goishihama, and the hornfels of Tarumihama stand as testaments to the massive geological shifts that birthed the gold of Michinoku, offering a profound sense of eternal time.