Higher carbon content causes greater deposition of iron sulfide, which appears as a black varve. This museum introduces the research outcome on the varve in Lake Suigetsu. In 1924, the Geochronological Institute, a special laboratory dedicated to varve research was established. The 45 m-long varve embedded in epoxy and thin-sectioned is on display. Llanquihue Lake's varves are a node point in southern Chile's varve geochronology. However this does not fully explain the presence of the nearly co-located varve clay beds. On the other hand, varve chronology in southern Sweden indicates a range of 14,050-13,900 BP. By matching varve patterns between the core samples, a 70 m-long varve was reconstituted. A varve represent an annual deposit of silt and clay. In varve years, the Subboreal corresponds to 5660 to 2750 years BP. More recently introduced terms such as 'annually laminated' are synonymous with varve. Each pair of layers is called a varve and represents one year. A varve is an annual layer of sediment or sedimentary rock. Because of this, the sediments annually form varve and then remain undisturbed.