This Australian cave hid 25,000 years of ritual secrets
New research shows that the Gunai‑Kurnai people used Cloggs Cave for ritual burning of grasses and placement of a standing stone over 25,000 years. Microscopic plant remains, or phytoliths, confirm deliberate collection and burning, while dating techniques pinpoint activity from 4,400 to 1,600 year…
In a remarkable archaeological breakthrough, scientists have traced ritual activity in Cloggs Cave, a limestone cavern in Victoria’s Gippsland region, back nearly 25,000 years. The study, published in Frontiers in Environmental Archaeology, relied on microscopic plant remains—phytoliths—to reveal how the Gunai‑Kurnai, the traditional custodians of the area, deliberately gathered grasses, carried them into the dark cave, and burned them in thin layers. Each ash layer was subsequently buried, preserving a continuous record of spiritual practice that spanned millennia.
From Ancient Grasses to Modern Science
Phytoliths are tiny silica structures that form inside plant tissues and can survive far longer than the plants themselves. Unlike pollen, which can travel by wind or insects, phytoliths tend to stay where the plant decayed. Because Cloggs Cave is devoid of vegetation, the presence of burnt phytoliths indicates that people—or possibly animals like possums—deliberately brought plant material into the cavern.
Researchers from Australia, France, and New Zealand examined samples from two excavation pits, one 1.5 m deep and the other 2.3 m deep. The upper layers of these pits contained 73 distinct ash strata dated between roughly 4,400 and 1,600 years ago using optically stimulated luminescence and accelerator mass spectrometry. Within these layers, a 28‑centimetre standing stone was uncovered, dated to about 2,000 years ago, further underscoring the site’s ritual importance.
Selective Gathering of Grass Species
Analysis identified 29 phytolith types representing grasses, herbs, and woody plants. Grass phytoliths dominated the assemblage, making up 97% of the total. The species fell mainly within the Pooideae and Panicoideae subfamilies—plants that thrive in temperate and warm, humid conditions, respectively—while drought‑tolerant Chloridoideae were less common. The diversity of plant parts—stems, leaves, flowers, roots—suggests that whole grasses were transported into the cave, including inedible portions.
Prior to European settlement, the landscape surrounding Cloggs Cave featured riparian forests and open woodlands. Yet the archaeological record shows a marked absence of woody plant phytoliths, implying that the Gunai‑Kurnai selectively chose grasses from the immediate vicinity rather than harvesting a random assortment of local vegetation. This intentional selection points to a symbolic or ceremonial purpose behind the plant offerings.
Burning as a Spiritual Practice
Approximately 18% of the phytoliths displayed signs of burning or melting, a pattern consistent across all dated layers. The repeated deposition of ash indicates that ritual burning was a long‑term tradition. Professor Bruno David of Monash University, who co‑led the dig, noted that the use of ash aligns with Gunai‑Kurnai customs of employing burnt material for magic, healing, and tracking the movements of spirits and visitors.
Other macro‑botanical evidence, such as fat‑smeared, trimmed wooden sticks from Casuarina trees, was found in deeper, older deposits, suggesting that woody plant rituals also occurred alongside the grass burning. Together, these findings paint a picture of a complex, evolving spiritual landscape within Cloggs Cave, maintained by successive generations of Gunai‑Kurnai people.
What Lies Ahead?
While the study illuminates the cave’s long‑term use, many questions remain. How did the ritual practices evolve over 25,000 years? What specific ceremonies were performed, and how did they change with climatic or social shifts? Ongoing collaboration with Gunai‑Kurnai Land and Waters Corporation aims to integrate oral histories with the material record, potentially filling gaps in the archaeological narrative.
Future research will focus on refining the dating of deeper layers, expanding phytolith analysis to include more plant families, and exploring the broader network of sacred sites across Gippsland. Such work promises to deepen our understanding of Indigenous spirituality and its enduring legacy in Australia’s natural heritage.
Key Takeaways
- Cloggs Cave’s ritual use spans approximately 25,000 years, as shown by ash layers and phytoliths.
- Burnt grass phytoliths confirm deliberate plant collection and burning by Gunai‑Kurnai ancestors.
- A 28‑cm standing stone, dated to 2,000 years ago, underscores the cave’s ceremonial importance.
- Phytolith analysis reveals selective gathering of specific grass species, not random vegetation.
- Burning practices align with traditional Gunai‑Kurnai rituals involving ash for magic, healing, and spirit tracking.
FAQ
- What are phytoliths? Tiny silica structures formed within plant tissues that can survive long after the plant decays.
- Why is ash significant? Ash layers indicate intentional burning, a key element of many Indigenous rituals.
- How were the layers dated? Using optically stimulated luminescence and accelerator mass spectrometry.
- What does the standing stone represent? A ritual marker placed by ancestors around 2,000 years ago.
- Is the site protected? Yes, it is managed in partnership with the Gunai‑Kurnai Land and Waters Corporation.
Why it matters
The discovery showcases the depth of Indigenous spiritual practice in Australia, offering tangible evidence of ritual continuity over tens of thousands of years. It also highlights the importance of collaborative research with Aboriginal communities to preserve cultural heritage.
Key points
- Cloggs Cave’s ritual use dates back ~25,000 years
- Burnt grass phytoliths confirm deliberate plant gathering
- A 28‑cm standing stone dates to 2,000 years ago
- Selective harvesting of specific grass species
- Ash layers align with Gunai‑Kurnai spiritual traditions
Frequently asked questions
What are phytoliths?
Tiny silica structures formed within plant tissues that can survive long after the plant decays.
Why is ash significant?
Ash layers indicate intentional burning, a key element of many Indigenous rituals.
How were the layers dated?
Using optically stimulated luminescence and accelerator mass spectrometry.
What does the standing stone represent?
A ritual marker placed by ancestors around 2,000 years ago.
Is the site protected?
Yes, it is managed in partnership with the Gunai‑Kurnai Land and Waters Corporation.
