Scientists Just Found a New Way to Investigate How Extinct Giants Ended Up in Australia’s Underwater Caves

Scientists have found a new way to study how extinct megafauna arrived in Australia’s underwater caves. The study, led by Griffith University PhD candidate Meg Walker and Professor Julien Louys, examined bones from two submerged cave systems in South Australia. Using advanced techniques like radiocarbon dating, X-ray fluorescence, and protein analysis, researchers identified chemical residues, bacterial damage, and ancient DNA. The findings show that bones in the caves were not buried in sediment but were exposed to light, leading to distinct staining patterns. The study also found that bones from dry cave sections showed different damage patterns compared to those in submerged environments.

• The team analyzed 41 specimens from Green Waterhole and Gouldens Sinkhole.
• They identified changes associated with different preservation environments by comparing submerged and dry cave bones.
• Light and algae played a key role in the staining patterns observed in the caves.

The study provides a framework for interpreting how megafauna fossils formed and changed in underwater caves. It highlights that the presence of certain markers does not necessarily indicate burial in sediment. The findings could help researchers understand how extinct animals arrived in these environments and how their remains were preserved. The study also notes that applying this framework to older fossils may reveal similar patterns, though more research is needed. The research team is still working to investigate the region’s submerged fossil record.

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