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Sanmyo Conglomeratic Schist

Explore the Sanmyo Conglomeratic Schist in Miyoshi, Tokushima: a natural monument showcasing unique metamorphic rock formations and geological history.

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The Sanmyo Conglomeratic Schist is a designated natural monument in Miyoshi, Tokushima, Japan, featuring unique metamorphic rocks with flattened pebbles, showcasing the region's geological history and tectonic forces. Part of the Sambagawa metamorphic belt, it offers a glimpse into the Earth's dynamic processes.

A brief summary to 三名含礫片岩

  • Yamashirocho Nishiu, Miyoshi, Yamashirocho Nishiu, Tokushima, 779-5451, JP

Local tips

  • Wear sturdy shoes suitable for walking on uneven terrain, as the schist is located along a riverbed.
  • Bring a camera to capture the unique textures and patterns of the flattened pebbles within the schist.
  • Combine your visit with a rafting trip through the Oboke Gorge for a thrilling experience.
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Getting There

  • Car

    From Awa-Ikeda Station (阿波池田駅), take Route 32 towards Oboke Gorge. The Sanmyo Conglomeratic Schist is located near the Oboke Gorge. Parking is available at the Mannaka Roadside Station (道の駅大歩危まんなか), a short walk from the schist exposure. Note that parking can be limited during peak seasons. There are no tolls on this route.

  • Public Transport

    From Awa-Ikeda Station (阿波池田駅), take a bus bound for Oboke (大歩危). Alight at the Oboke bus stop. From there, it is a short walk to the Sanmyo Conglomeratic Schist along the river. The bus fare is approximately ¥500. Check the bus schedule in advance as services may be infrequent.

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Discover more about 三名含礫片岩

The Sanmyo Conglomeratic Schist (三名含礫片岩, Sanmyō Ganrekihekigan) is a fascinating geological site located in Yamashirocho Nishiu, Miyoshi, Tokushima Prefecture, Japan. This natural monument features a rare type of metamorphic rock known as conglomeratic schist, formed from ancient conglomerate rocks that have undergone intense pressure and heat. The most striking characteristic of this rock is the presence of well-rounded pebbles and gravels flattened and stretched within a sandy matrix, a testament to the immense forces at play during its formation. These schists belong to the Sambagawa metamorphic belt, a vast zone of metamorphic rocks stretching across Japan. The rocks in this area were originally formed from sediments deposited on the ocean floor, which were then subjected to high pressure and temperature during plate subduction. The Sanmyo Conglomeratic Schist is unique because it contains rock fragments of continental origin, making it a rare example of metamorphosed conglomerate within the Sambagawa belt. The pebbles within the schist are primarily composed of siliceous igneous rocks such as biotite quartz diorite, granite porphyry and quartz porphyry, along with some sandstone and mudstone. Visitors to the site can observe the schist's distinctive features, including the flattened pebbles and the alignment of minerals, which give the rock a layered appearance. The schist is exposed along the riverbed of the Iya River (祖谷川) and the Tonotani River (戸ノ谷川), downstream from their confluence, and along the prefectural road downstream from the Ichiu Power Plant. The Sanmyo Conglomeratic Schist can be seen in the riverbed of the Oboke Gorge (大歩危峡). The area around Oboke and nearby Koboke Gorge is known for its stunning natural beauty, with opportunities for rafting and enjoying the views.

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