Fig. 1

Collection sites of moss agate specimens in the Bodai and Imakane districts, along with geological maps of the surrounding area (simplified from Kaseno10; Oka and Katsutoshi11). Moss agate specimens from the Bodai district were collected directly from bedrock outcrops. In contrast, because the bedrock outcrops are covered by dense vegetations, the specimens from the Imakane district were obtained as pebbles, which are considered to have been transported from the areas of pyroclastic rocks.