Karavankina praepermica

Karavankina praepermica Ramovš, 1966

Savske jame (1?), Planina pod Golico, the western Southern Karavanks.

Auernig Formation

Tempestite deposit?

Limonitized steinkerns (originally siderite) in brachial (left) and pedicle (right) views with specimen on the left showing interior mold of brachial valve with exposed imprint of median septum.

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.