The progression of iron oxide (goethite) concretions that have formed due to nucleation around small cracks in siltstone and shale. From the Copley area, northern Flinders Ranges.
Iron Oxide Concretions: Copley
Triassic plant fossils in concretions
Triassic plant fossils within concretions formed in the sedimentary layers of the Leigh Creek coal formation. The concretions appear to have been formed in concentric layers within the sediment, and within these are enclosed Triassic plant fossils, approximately 230 million years old.
