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Aboriginal artefacts on the continental shelf reveal ancient drowned cultural landscapes in northwest Australia

The DHSC project team has published a new open access article in the international journal PLOS ONE: ‘Aboriginal artefacts on the continental shelf reveal ancient drowned cultural landscapes in northwest Australia’

We report Australia’s first confirmed ancient underwater archaeological sites from the continental shelf, located off the Murujuga coastline in north-western Australia. Details on two underwater sites are reported: Cape Bruguieres, comprising > 260 recorded lithic artefacts at depths down to −2.4 m below sea level, and Flying Foam Passage where the find spot is associated with a submerged freshwater spring at −14 m.

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The DHSC project team recognises the Murujuga Aboriginal Corporation Council of Elders and Murujuga Land and Sea Rangers Unit as core collaborators on this project.

The DHSC project was supported by the Australian Research Council, Flinders University and the Hackett Foundation. We thank our many colleagues, volunteers, and friends of the project including Ken Mulvaney, Shakti Chakravarty, Victoria Anderson, Sarah de Koning, Hiro Yoshida, Kerry Ludwig, Mads Holst, Sam Wright, Annette George, Tom Allardyce and Graham and Michelle Evans and the AustMarine staff for their support throughout the DHSC project. Further thanks to EGS Surveys and the Pilbara Ports Authority for supplying additional survey data.

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Link to the full article published in the Public Libarary of Science (PLOS ONE):

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0233912 

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Welcome to our project blog!

Deep History of Sea Country: Climate Sea level and Culture

Funded by Australian Research Council (Discovery Project DP170100812)

Submerged landscape archaeology is an under-researched field in Australia and represents a major opportunity to address knowledge gaps in world prehistory such as early human migrations, the archaeology of land bridges and coastal-hinterland cultural exchange.

 

Exploring Sea Country through high-resolution 3D seismic imaging of Australia’s NW shelf

https://www.sciencedirect.com/science/article/abs/pii/S0277379120303152

DHSC CI Mick O’Leary et al have published a new article in Quaternary Science Reviews.

Almost 2 million square km of Australia’s continental shelf was flooded following the termination of the last glacial maximum, and with it the cultural heritage of the first arrival and coastal occupation of Australia beginning some 65,000 years ago. In order to prospect for this missing cultural record, we must first identify submerged coastal landscapes and landforms that likely provided favourable environments for occupation and resource use. However, this task is challenged by the sheer size of the Australian continental margin. To help address this, we use industry 3D seismic datasets, that cover vast areas of Australia’s continental shelf, to map seafloor bathymetry at high resolution (10e25 m). Our study focuses an area of 6500 square km on the mid/outer shelf regions proximal to Barrow Island. The 3D seismic bathymetry revealed a highly complex and geomorphically mature coastal landscape preserved at depths of 70e75 m below sea level, including coastal barrier dunes, lagoonal systems, tidal flats and estuarine channels. Based on the depth of the submerged shorelines and reconstructed sea level curves, the age range of these coastal landforms is constrained to Marine Isotope Stage 3 (57e29 ka), which overlaps with the known onset of occupation at Barrow Island and the wider Carnarvon bioregion and the adjacent Pilbara. Such feature preservation has significant geoheritage value, but also allows for human behavioural ecology modelling and provides targets for future dating and site survey.

DHSC Project Team: Chief Investigators Jonathan Benjamin and Mick O’Leary

This is part of an on-going series featuring the DHSC project team. This post features Dr Jonathan Benjamin, Associate Professor in Maritime Archaeology at Flinders University and Dr Mick O’Leary, Senior Lecturer in Marine Geosciences as the University of Western Australia. The two have been collaborating since 2016 and have spent the past three years with the DHSC team investigating the seabed in Murujuga (Dampier Archipelago).

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Dr Jonathan Benjamin during DHSC fieldwork (photo: S. Wright)

I learned to dive in 2003 just before moving to Scotland where I undertook my Ph.D. in Archaeology at the University of Edinburgh. Before that, I had spent my undergraduate years studying four-field anthropology, with a focus on palaeoanthropology and archaeology, first at Boston University before completing my BA at UCLA. I loved archaeological fieldwork, language and travel, and so I minored in French and went on to study European prehistory at Edinburgh. There, I combined my interest in archaeology with underwater field methods, first in the cold waters of Scotland’s inland lochs, before shifting to the Mediterranean and warmer, saltier water. I wrote my Ph.D. on the Northern Adriatic, asking: where were the Neolithic and Mesolithic coastal sites in the region? I stayed focused on European prehistory for some time, before turning to the wider issues of coastal and underwater archaeology as a specialisation, working on sites and material culture from all chronological periods. That experience led to my appointment at Flinders University in 2014 when I took up a lectureship in the maritime archaeology program in Adelaide, South Australia, which I now call home (I am proudly a dual citizen). The role as Lead CI on the DSHC project has been a steep learning curve for me, working on a complex project with a large team and my first real experience in Australian archaeology and coastal geomorphology. I had my first cultural awareness inductions with the Traditional Owners and attended my first Council of Elders meetings as a guest of the Murujuga Aboriginal Corporation, who formally authorised their approval our project. Working in unfamiliar territory has been a challenge, but also an incredible opportunity to learn about landscapes and people, past and present.

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Dr Benjamin coordinating the team of scientific divers during DHSC fieldwork (photo: S. Wright)

The DHSC project is an international project with two case study areas. We’ve incorporated method and theory from both Australian archaeology and from Europe, where submerged landscape studies has matured into a bona fide sub-discipline of archaeology and marine geosciences, with considerable contributions from the SPLASHCOS Network and my mentor and DHSC Senior Scholar Prof Geoff Bailey. The landscapes where we have worked during DHSC, in Denmark and northwest Australia, could not be more contrasting. Yet the archaeology, and the ways we study past cultures, has made for some remarkable and though-provoking comparisons. Worldwide, ancient coasts and their human inhabitants were significantly impacted by rising sea levels during the last glacial period, and subsequent warming into the early Holocene. By working with local specialists and studying the evolving coasts we can consider the impacts of marine transgression on past peoples and the archaeological sites they left behind thousands of years ago.

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The Australian sun is no joke! (photo: S. Wright)

Suffice it to say, that the move from Northern Europe to work in the heat of north-western Australia took some acclimation! Fieldwork in Australia is very different, but it is also incredible. The country is magnificent, and its archaeology is ancient and beautiful. Diving in a region that is warm and plentiful in marine life has been a pleasure, though we have had to take a few extra precautions due to the size of some of the local fish! Fortunately for us, they are well fed and shy. Despite these beautiful distractions, and the ever-present need to consider health and safety of our team during all our operations, our scientific diving has remained firmly focused on the search for submerged cultural heritage and drowned archaeology.

Day_6__08840.jpgDr Jonathan Benjamin and Dr Maddy Fowler investigate the intertidal zone during DHSC fieldwork (photo: S. Wright)

Amongst the most rewarding aspects of the DHSC project has been working with our team, in particular Mick O’Leary who has taught me an incredible amount about geomorphology, both generally and as a regional expert on the northwest shelf. ‘I will never again go into the field without a geomorphologist!’ I remember saying during one of our field campaigns that we have co-directed over the past several years in Murujuga (Dampier Archipelago). Indeed, a good geomorphologist is worth their weight in gold! It is especially great to be able to stand on the bow of a boat and discuss physical landscape evolution, and review how and where underwater archaeological site preservation is most likely to occur. For an archaeologist working on submerged landscapes, this is priceless and has led to a great collaboration and joint supervision of talented emerging scholars in submerged landscape studies.Day_6__09747.jpgDr Jonathan Benjamin during DHSC fieldwork (photo: S. Wright)

It is also a big job to undertake a major scientific diving operation as part of a research project like this one. Seeing our research students and early career colleagues, who represent the next generation in archaeology, emerging into specialists in their own right has been incredibly fulfilling, and fun! I am fortunate to have had a great team of colleagues and students to work with during the DHSC project. Working on these ancient submerged landscapes in collaboration with the local TOs and with a team of such enthusiastic researchers and emerging scholars has been an honour.

Day_5__08020.jpgDive tanks must be filled at the end of each day (photo: S. Wright)

Dr Mick O’Leary (University of Western Australia)
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Dr Mick O’Leary getting wet during DHSC fieldwork 

As a marine geoscientist with research expertise in the fields of tropical coastal geomorphology, coral reef and reef-island evolution, and climate change I have been in charge of the geo-scientific and landscape evolution elements of the DHSC project. I studied at JCU, earning a BSc (Hons) and PhD in 2007 before being awarded a three year Leverhulme Trust Post Doctoral Fellowship at Manchester Metropolitan University in the UK. I went on to undertake on a Research Fellowship at Boston University (USA) before going on to work at Curtin University and now UWA. I have held a leadership role as CI on the DHSC Project since its inception and worked alongside my archaeological colleagues to help understand the region, its natural and cultural histories.

My main research focus is on ancient sea-level reconstructions during periods of known climate instability. And although I mostly focus on past sea levels, the data we collect can also be used to inform, future sea-level rise and their impacts.

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Dr Mick O’Leary recording an intertidal feature during DHSC fieldwork

Working on the DHSC and its research objectives since the beginning has required a multidisciplinary, synergistic approach to fieldwork and project planning. We have applied traditional elements of geomorphology, sedimentology and palaeoecology, high resolution geochronological methodologies with cultural and archaeological method and theory. In this respect, the DHSC project has been a true geoarchaeological project, with its results reflecting the various disciplines and perspectives represented by this team. We’ve gotten to know a range of people and colleagues and have shared many long days aboard our local charter vessel.

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Dr Mick O’Leary operating the drop-camera during DHSC fieldwork. Mick’s hot tip: never keep your car keys in your shirt pocket while working on a boat!

Fieldwork is fun but exhausting! We are up early, on the boat and going back and forth between islands. The days can be long but are also very rewarding. And discovery of new sites and new ideas never gets old. The DHSC project has been a great opportunity to jump in and get wet, quite literally! And working in Murujuga in consultation with the Traditional Owners has been a privilege. The DHSC project has also opened up a new frontier in archaeology, bridging geo-sciences with maritime archaeology in a way that has never been done before. It is something we can be proud of and will surely look back in future years to come with fondness and respectful appreciation to the team, the TOs and the local community.

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Dr Mick O’Leary, imagining geomorphology as an Olympic sport during DHSC fieldwork

DHSC Project Team: Chief Investigators Jo McDonald and Sean Ulm

This is part of our on-going series on the DHSC project team. In this post we feature two of the project’s Chief Investigators, Prof Jo McDonald (University of Western Australia) and Prof Sean Ulm (James Cook University).

DHSC CI Prof Jo McDonald 

I first started working on the Murujuga rock art (petroglyphs) when helping to write the scientific values report for the National Heritage Listing in 2005.  Since moving to UWA in 2012, I have worked more intensively on the rock art and archaeology in this inscribed landscape. I have taught undergraduates annually at the RioTinto/MAC/UWA rock art field school, and was the Lead CI on the recently completed Murujuga: Dynamics of the Dreaming ARC Linkage project (MLP). My role on DHSC has been to continue the collaboration with the Murujuga Aboriginal Corporation (MAC), and to assist in the interpretation of cultural landscapes, coastal sites and any intertidal and submerged archaeology, by providing the terrestrial context from nearby and adjacent islands.

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Prof Jo McDonald during DHSC fieldwork (Photo: E. Beckett)

Working on DHSC has been great because it has provided boat access to potential submerged landscapes across the entire Archipelago.  This has been a welcome change to the systematic intensive recording and excavation programme, which involved slogging across islands on foot, fighting our way through dense un-burnt spinifex and camping-out for extended periods.  Some of the outer islands have been important to visit, as they have provided an extraordinary counter-point to some of the bigger islands with different geology and quite different archaeological records.

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Prof Jo McDonald during DHSC fieldwork (Photo: E. Beckett)

Our investigation of coastal stone features – combined with the LIDAR data, geomorphology, radiocarbon dating and diver surveys made this a plum area of potential – which has borne remarkable fruit.  So far, we have found limited hard rock – the matrix for region’s significant petroglyphs – extending into the intertidal and submerged waters.  We have, however, found numerous intertidal features (like Aboriginal quarries and fish traps), as well as documenting some amazing coastal platform petroglyph sites. This amazing cultural landscape involves both land and sea: we are looking forward to finding out more about the interface between the two domains.

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Prof Jo McDonald during DHSC fieldwork

 

DHSC CI Prof Sean Ulm

My core expertise is in Aboriginal and Torres Strait Islander coastal and island archaeology. Over the last 20 years I have led a large collaborative network of Quaternary scientists (geomorphology, chemistry, geology, ecology, palynology, palaeoclimatology, oceanography and zooarchaeology) and Indigenous communities to recast our understandings of coastal occupation models from the Holocene (the last 10,000 years) by integrating accurate climate models with detailed analyses of coastal archaeological sites. These studies articulate an integrated programme of research to increase confidence in data resolution underpinning models of past human behaviour. I consider continental shelf archaeology and underwater cultural heritage management to be of critical importance to both archaeologists and Indigenous communities. Working on the DHSC project has seen the realisation of an ambitious goal to fully integrate a team of archaeologists, geoscientists and Traditional Owner community members working seamlessly on land and below the sea.

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Prof Sean Ulm during DHSC fieldwork

My research focuses on persistent problems in the archaeology of northern Australia and the western Pacific where understanding the relationships between environmental change and cultural change using advanced studies of archaeological and palaeoenvironmental sequences are central to constructions of the human past. My priority has been to develop new tools to investigate and articulate co-variability and co-development of human and natural systems. These studies are part of a broader concern with increasing confidence in and resolution of the data used to develop models of past human behaviour. My research expands the methodological toolkit of archaeology by developing novel applications to refine the chronologies and resolution of data from coastal sites, including refining radiocarbon dating of marine materials; use of geospatial analysis to examine large-scale Aboriginal population and mobility changes; use of remote sensing to map Aboriginal intertidal structures; the development foraminifera and bivalve conjoin analyses to disentangle natural and anthropogenic marine shell deposits; and the use of stable isotope analyses to discriminate shellfish habitat. Understanding site formation processes and chronology-building are fundamental building-blocks of archaeological research.

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Prof Sean Ulm working in the shallow waters off QLD

The DHSC project has been a natural extension of my interests and expertise and represents an exciting new strand of Australian archaeology. Managing, investigating and understanding the archaeology of the Australian continental shelf in partnership with Indigenous Traditional Owners and custodians is one of the last frontiers in Australian archaeology. The results of the DHSC project will present some of the first steps in this journey of discovery, and confirming the archaeological potential of Australia’s continental shelves, and in beginning to fill what has remained until now a major gap in the human history of the continent.

 

The Archaeology of Europe’s Drowned Landscapes (Bailey et al 2020)

New Book! Open Access (Bailey et al 2020)

DHSC Senior Scholar Prof Geoff Bailey has been a pioneer in Submerged Landscape Archaeology for forty years. Now he has led the successful European SPLASHCOS Network to its final output, a major peer reviewed volume, published Open Access and available free for everyone.

This is a benchmark volume that will serve as a resource for scholars and students of archaeology and quaternary sciences for decades to come. The book is available to download via SpringerOpen.

https://link.springer.com/book/10.1007/978-3-030-37367-2#toc