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Accretionary lapilli

Iwadono hill

Numanoue, Ohashi, Hatoyama city, Hiki county, Saitama pref., Japan

Accretionary lapilli

Field of view: 40 mm. Accretonary lapilli included in a tuff bed.. 2 accretionary lapilli at the bottom are cross section showing faint concentric structure.

Recovered from a tuff bed associated with diatomaceous siltstone of Shogunzawa Formation deposited in the submarine environment. Formed in middle Miocene (10 Ma).

Accretionary lapilli from this location was described in 1967.

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