Mount Azumaya was formed between 900,000 and 300,000 years ago by andesite lava flowing out of a Stratovolcano. An eruption 340,000 years ago formed a caldera of circa 3 kilometers in diameter. Through erosion the mountain has arrived at its present form with several peaks. is the general term for the following peaks lying roughly on a circle: , Mount Azumaya, , .