New archeological research highlights major blind spots in Australia's environmental management policies, placing submerged Indigenous heritage at risk. The Deep History of Sea Country (DHSC) project team has uncovered a new intertidal stone quarry and stone tool manufacturing site, as well as coastal rock art and engravings, during a land-and-sea archeological survey of the Pilbara coastline in Western Australia (WA).
The findings have been published alongside a separate study focused on the Northern Territory which identified underwater environments dating back to the Pleistocene that could provide important environmental and cultural insights into ancient Indigenous migration, land use, and early occupation of Australia.
The findings, published today in Australian Archaeology, outline the need for a national policy that ensures resource companies operate with care for Aboriginal heritage and develop protections against climate change, dredging, windfarms, interconnectors, and seabed mining while ensuring industry collaborates with Indigenous stakeholders and archeologists.
Aerial, landscape, and ground surveys of North Gidley Island and Cape Bruguieres in Western Australia represent fresh evidence of cultural heritage where hundreds of submerged ancient stone tools made by Aboriginal people, dating back to more than 7,000 years ago, were discovered. The team has yet to determine the exact age of the sites found on the intertidal zone and fully submerged channel, but the results demonstrate a promising way forward to study the integrated landscape above and below the waterline.
Associate Professor Jonathan Benjamin, who is the Maritime Archaeology Program Coordinator at Flinders University's College of Humanities, Arts and Social Sciences said, the challenge we now face for Australian submerged heritage is to extend the discoveries made at Murujuga to other areas, both in the land and seascape around these sites, but also across the Australian continental shelf.
We need to better understand and manage this underwater cultural heritage through local and national approaches. We must consider the very different scales of research, from 'big data' down to the boots-on-the-ground and snorkels-in-the-mouth as we comb Australia's coasts, intertidal zones, and submerged environments to record new archeological sites. Submerged sites are highly likely to be discovered around the continent, and down to depths as great as 130 meters.
An international team of archeologists from Flinders University, The University of Western Australia, James Cook University, ARA Airborne Research Australia, and the University of York (United Kingdom) collaborated in partnership with the Murujuga Aboriginal Corporation to produce novel aerial and intertidal surveys of the cultural landscape in WA.
The lead author Jerem Leach, who recently completed his Master's Degree in Maritime Archaeology at Flinders said, we found evidence of a diverse range of cultural activities across North Gidley Island, including evidence of ancient seed processing, marine resource use, lithic quarrying and production, rock art production, and ceremonial activities. Dating this range of activities remains challenging, but there is some indication from engravings and submerged material that North Gidley Island was occupied at the terminal Pleistocene and into the Holocene,.
In 2019, the dive team mapped 269 artifacts at Cape Bruguieres in shallow water at depths down to 2.4 meters below modern sea level. Radiocarbon dating and analysis of sea-level changes show the site is at least 7000 years old.
Distinguished Professor Sean Ulm from the ARC Centre of Excellence for Australian Biodiversity and Heritage, James Cook University, a co-author of the study said, artifacts embedded in aeolianite provide an opportunity to understand the age of at least some of these stone artifacts, which could be supported by excavation both on land and in the more sheltered and sediment-rich intertidal zones north of the Cape Bruguieres channel. The Gidley Islands represent a continuous cultural landscape above and below that waterline that tell the story of people responding to climate change, a story that incorporates the re-negotiation of landscape use between maritime and arid coastal communities, much like we see with climate change today. Rock art engravings, grinding patches, quarries, and upstanding stones some of which are in the intertidal zone point to the possibility of discovering new underwater sites in WA, and around Australia.
Dr. John McCarthy of Flinders University, says the area to the north of the Northern Territory coast contains the widest part of the continental shelf, in an area with special importance as it lay between Australia and New Guinea at the time of first peopling of the continent when these two landmasses were connected into a single landmass known as Sahul. We concluded that submerged landscapes around Darwin and Bynoe Harbours provide varied and partially sheltered environments with maximum availability of facilities to support fieldwork. More remote areas attractive for prospection include the Tiwi Islands, the Wessel Islands, and within the Gulf of Carpentaria, Groote Eylandt, and the Sir Edward Pellew Islands, where the focused energy of currents and tides may provide windows of opportunity through erosion of sediments. Our Northern Territory study has highlighted a blind spot in marine management in this country. Submerged archeological landscapes have not been included in nationally coordinated studies on marine biology and shipwreck heritage. With this study, we provide a template for state-level baseline studies to extend the search for submerged landscapes nationally.
Dr. McCarthy was also recently awarded an ARC Discovery Early Career Researcher Award to develop new machine learning tools to reduce the cost of the search for these submerged landscapes.
Scientists estimate there were 2 million square kilometers more coastal plain during the last Ice Age compared with today, and the larger coastal lands now forming Australia's underwater continental shelf are expected to hold many significant archeological sites.
The submerged cultural landscapes represent what is known today as Sea Country to many Indigenous Australians, who have a deep cultural, spiritual and historical connection to these underwater environments.
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