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Septaria

Septaria
Locality: Kurishima, Kanaya-cho, Haibara-gun, Shizuoka-ken, Japan

This stone is called gthe Turtle Stoneh because of the pattern on the surface looks like turtle shell. But, it is not a turtle fossil. It is a kind of limy concretion. The pattern on the surface is sun-dried mud crack.

–ί‚ι