Tōjinbō
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Key facts
- Protected area.name
- Tōjinbō
- Protected area.iucn_category
- IV
- Protected area.image
- Japan Tojinbo02n4592.jpg
- Protected area.image_caption
- Sandan Rocks and Byobu Rocks
- Protected area.map
- Japan Fukui Prefecture#Japan
- Protected area.map_caption
- Location of Tōjinbō
- Protected area.location
- Sakai, Fukui, Japan
- Protected area.established
- 1935
via Wikipedia infobox
Article
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- Formation
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- References
is a series of cliffs on the Sea of Japan in Japan made from columnar joints of pyroxene andesite. It is located in the Antō part of Mikuni-chō in Sakai, Fukui Prefecture. The cliffs average in height and stretch for . The site has been protected from 1935 as a nationally designated Place of Scenic Beauty and Natural Monument, It has been developed as a tourist destination, with walking trails, sightseeing boats, an observation tower, and a shopping arcade. The area is part of the Echizen-Kaga Kaigan Quasi-National Park.
==Formation== The cliffs' rocks were originally formed 12 to 13 million years ago during the Miocene Epoch due to various volcanic activities, and were created by magma mixing with sedimentary rock to form columnar joints of pyroxene andesite containing Plagioclase crystals, Augite and Enstatite crystals in pentagonal or hexagonal shapes, which has been eroded by the sea. This formation is considered geologically extremely rare, and is one of only three such structures in the world of this magnitude.