These flute casts are part of the limey mud deposits of the Wonoka Formation. Flowing water in the marine trough (the Adelaide Geosyncline approximately 580 mya) hollowed grooves (flutes) into deep sea floor sediments. These flutes fulled with slurries of mud which are preserved as flute casts seen in Bunyeroo Creek in the Ikara- Flinders Ranges National Park.
