Fraser Island (K'gari) and initiation of the Great Barrier Reef linked by Middle Pleistocene sea-level change

A groundbreaking study links the formation of Fraser Island (K'gari) and the initiation of the Great Barrier Reef to Middle Pleistocene sea-level changes. Using optically stimulated luminescence and palaeomagnetic dating, researchers determined that the extensive dunes of Fraser Island and adjacent Cooloola Sand Mass formed between 1.2 million and 0.7 million years ago during a period of global climate reconfiguration. This formation was driven by increased sea-level fluctuations due to growing ice volume, which redistributed sediment across the continental shelf. The development of Fraser Island significantly reduced sediment supply northward, creating conditions conducive to coral reef growth in the southern and central Great Barrier Reef. This study suggests that such coastal sedimentary system reorganizations may not be unique to eastern Australia and warrants further investigation in other passive-margin coastlines.

Ellerton, D., Rittenour, T. M., Shulmeister, J., Roberts, A. P., Miot da Silva, G., Gontz, A., Hesp, P. A., Moss, P., Patton, N., Santini, T., Welsh, K., & Zhao, X. (2022). Fraser Island (K’gari) and initiation of the Great Barrier Reef linked by Middle Pleistocene sea-level change. Nature Geoscience, 15(12), 1017–1026. https://doi.org/10.1038/s41561-022-01062-6