There are nine classical dragon types in Chinese mythology. 伏藏龙 Fúcánglóng, the Dragon of Hidden Treasures, is one of them. These dragons guard buried treasures, both natural and man-made. 火山 are said to be created when 伏藏龙 Fúcánglóng bursts out of the ground to report to heaven.
Pyroclastic volcanic eruptions played a major role in perserving the Jehol fossils in China. The fossils discovered in the fossil beds of northern China are famous for their exceptional preservation and incredible diversity. To learn more about the Jehol fossils in China: Jehol Fossils and Volcano gave China its Dinosaur Trove.