Monzen no Oiwa, Limestone outcrop in Yura, Japan
The Monzen no Oiwa formation stands 18 meters tall with a width of 22 meters east to west and 18 meters north to south.
The limestone outcrop received national monument status on December 24, 1935, marking its importance in Japanese geological preservation efforts.
The formation contains numerous Cidaris sea urchin fossils, which local residents named 'umeboshi' due to their resemblance to pickled plum seeds.
Visitors can reach the outcrop through a 30-minute walk from Kii-Yura Station on the JR Kisei Main Line.
The site contains rare Jurassic period Cidaris fossils found in only a few locations throughout Japan, making it a reference point for geological studies.
GPS coordinates: 33.97511,135.13197
Latest update: March 7, 2025 23:06
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