A place where coal is exposed at the ground surface. This enormous seam is 24 shaku (about 7.3m) thick. It's spectacular.

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The large coal outcrop in Yubari is an important geological landmark located in Yubari City, Hokkaido. This area once flourished as a center of Japan's coal industry, with many coal mines in operation. A large outcrop is a geological layer exposed at the ground surface, and here the coal seams can be observed directly. This allows visitors to learn how coal formed and supports education in geology and history. Today it is also a popular tourist destination, introducing visitors to Yubari's industrial heritage and natural beauty. It is a valuable place where you can feel the power of nature while learning about the history of the coal industry.

2025·R7.9.23 A return visit, but it's been decades, so I've forgotten almost everything. Yubari's large coal outcrop (rotō: a place where geological layers and rocks are exposed outdoors), the “Yubari 24-shaku seam,” is one of the exhibits at “夕張市石炭博物館” and is a “Hokkaido-designated natural monument in the geology and minerals category,” located outside the museum exit. 『The starting point of the coal city Yubari~One of the outcrops discovered in 1888(M21) by 坂 市太郎 (Ban Ichitaro), an engineer with the Hokkaido Government (he reportedly began his survey from Horonai (Mikasa) in the autumn of that year). Coal mine development in Yubari began 2 years after this seam was discovered, so this can be called the starting point of the coal city Yubari. Its large scale is unparalleled elsewhere in Japan, and it is extremely valuable as a natural specimen for education and natural science. It is a geological layer from the Paleogene period of the Cenozoic era (about 50 million years ago), comprising ten-shaku, eight-shaku, and six-shaku seams from bottom to top, with a total thickness of twenty-four shaku (about 7.3m). This high-quality bituminous coal (seam) played an extremely important role in Japan's modernization as raw-material coal used in ironmaking. Conifers such as metasequoia are believed to have been its source material. It was designated a Hokkaido natural monument in 1974(S49).』(Excerpt quoted from the Yubari City tourism website) It is also one of the constituent cultural properties of the Japan Heritage designation: 『See Japan's National Policy in Hokkaido! ~The Industrial Revolution of the North, “炭鉄港”~』.

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Visited 24/9 A place with exposed coal where it's no exaggeration to say all of Yubari's coal mining began. It's tucked away rather inconspicuously at the edge of the coal museum. (The sign is big, though..)

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I saw an impressive coal seam. It was a little disappointing that construction was underway.