Description

Middle Miocene (Mohnian)

Aguajito Shale Member, Monterey Fm.

Carmel, CA, USA

The 0.5 inch aperture of an unknown mollusc. Rarely found even on recent gastropods.

Other Mollusc.

Bivalve shell impressions are sometimes found at this site but gastropods are quite rare so this specimen was very unexpected.  It’s an oddity for the collector looking for examples of unusual preservation.