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.