Kashiba City
Nijo-san Museum


Old Stone Age

The main themes of the Nijo-san Museum are "Mt. Nijo (also called Mt. Futakami) and three stones," which may sound a little mysterious. While Mt. Nijo has long been worshipped as a mysterious mountain since the age of Manyoshu (Nara Period, 710-794), it once had a quite different aspect.
About 20 million years ago, the mountain was an active volcano with repeated large-scale eruptions. The eruptions produced various igneous rocks. Particularly interesting among them are the following three rare types of stone: sanukite, volcanic tuff and garnet (emery). The areas in which sanukite is produced are limited to Sanuki (the present Kagawa Prefecture) and Mt. Nijo, both in the inland sea (Setonaikai) area. Tuff was mined from the Donzuru-bo hill area.
In this way, Mt. Nijo has not only given people a deep impression due to its elegant appearance, but has also supplied these three stones as useful materials for daily life. The Nijo-san Museum visually presents the history and nature of the mountain in a familiar manner, focusing on the three stones.

Tourist Information

Source: The Kashiba municipal government

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