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4. Brachina formation, Siltstone, shale and sand stone, 600 million years old.
Photos below crossing the ridge at the Brachina formation.
Billy Creek formation, Red shale, siltstone and sandstone, 525 million years old
12. Wirrealpa Limestone. Grey limestone, 520 million years old
These were not photographed
9. Rawnsley quartzite, White quartzite, 550 million years old
10. Parachilna formation, Sandstone and siltstone, 540 million years old
These were not photographed
8. Bonney sandstone, Red sandstone, 560 million years old
6. Bunyeroo formation, Shale and limestone, 580 million years old
7. Wonoka formation, Limestone and siltstone, 570
million years old
These were not photographed
5. ABC Range quartzite, White quartzite, 590 million years old
11. Wilkawillina Limestone, Reef-type limestone, 530 million years old
Brachina Gorge Geological Trail - Flinders Ranges
Brachina us said to be derived from the Aboriginal word ‘vachina’, meaning cranky, refers to a mythical argument between birds over
a grind stone.