AKIYOSHI Limestone
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"Akiyoshidai is the largest karst plateau in Japan and is designated as a special natural monument. During the Paleozoic Coal to Permian Era (350 million years ago), Akiyoshidai was located in the sea and was a coral reef. The calcium matter that accumulated on the seafloor and crystallized is called limestone. The coral reefs have now been uplifted from the sea to become land, and have become a national park and a famous tourist attraction that attracts visitors every day. The metamorphosed limestone is called marble.
(*Precisely, marble is called onyx marble and is distinguished from limestone.) Limestone is white, while marble is gray with a unique and beautiful striped pattern. White limestone allows light to pass through."