Savske jame (1?), Planina pod Golico, the western Southern Karavanks.
Limonitized steinkern (originally siderite) in pedicle view and external mold of brachial valve.
Absence of compression in the sample indicates mineralization prior to sediment compaction. Organic decay released carbon dioxide, reacting as carbonic acid with ferrous-ion-enriched pore water to form siderite, subsequently altered into limonite.