• People in Sulawesi may have been habitually using a neuroactive plant as far back as 25,000–16,000 years ago.

A new study in Science Advances examines two preagricultural foragers from South Sulawesi, Indonesia, separated by thousands of years but sharing an unusual dental pattern: deep, rounded, circumferential wear that does not match ordinary chewing. The researchers argue that the wear formed through repeatedly holding, sucking or gently gnawing a small, hard object in different parts of the mouth. 

Using LC-MS, the team detected arecoline—a characteristic alkaloid of areca, or “betel”, nut—in dental samples from both individuals. One came from Leang Bulu Bettue and dates to 25–16 ka; the other, from Leang Cappalombo 1, is associated with deposits dating to around 7.6–6.3 ka. 

This was probably not betel chewing in the form familiar today. Modern betel quid typically combines processed areca nut with slaked lime and other ingredients. To test whether a simpler practice was plausible, the researchers soaked intact areca nuts and applied the resulting solutions to cells expressing human receptors. The experiments showed that intact nuts could release physiologically active arecoline without slaked lime. Combined with the dental wear, chemical residues and experiments support the authors’ interpretation that these foragers habitually sucked whole areca nuts.

For now, the sample is just two individuals, and psuggestions that the nuts were used for stimulation, pain relief or medicinal purposes remain hypotheses. What the study does show is that habitual neuroactive plant use may reach far deeper into the hunter-gatherer past than the archaeological record had previously demonstrated. 

Reference
Brumm et al. 2026. “Betel nut sucking is the earliest recorded evidence for the habitual use of a neuroactive plant drug.” Science Advances.
10.1126/sciadv.aei1901

#SoutheastAsianArchaeology #Sulawesi #IndonesiaArchaeology #Prehistory #BetelNut
  • Twenty-two small beads can preserve the traces of a much larger world of movement and exchange.

A new archaeometric study examines beads excavated in 2023 at Khok Phithak, within the ancient city of Khu Bua in Ratchaburi, central Thailand. Khu Bua was an important urban centre associated with the Dvaravatī cultural sphere, enclosed by earthen ramparts and moats and situated within the Mae Klong river system. 

The researchers analysed 21 glass beads and one chalcedony/agate bead, combining microscopic observations with VP-SEM-EDS, LA-ICP-MS and micro-Raman spectroscopy. Manufacturing traces—including axial colour streaks and elongated bubbles—indicate that most of the glass beads were made by drawing glass into tubes or canes before cutting them into individual beads. 

Their chemistry indicates that nineteen beads belong to the m-Na-Al-1 glass subgroup, consistent with glassmaking traditions documented in South Asia, particularly the wider technological sphere of southern India and Sri Lanka. Together with their manufacturing technique, the authors associate these beads with the large-scale Indo-Pacific beadmaking tradition. 

However, one blue bead, B014, is made from plant-ash soda–lime glass with a broad western Asian affinity—although the study cannot identify a specific production centre. Another remarkable bead, B007, appears to have been wound from recycled iron-smelting slag, suggesting an entirely different production history.

Rather than evidence for primary glassmaking at Khu Bua itself, the authors interpret the assemblage as reflecting an inland centre of consumption and possibly redistribution, connected through maritime and riverine networks to much wider systems of Indian Ocean exchange. 

Reference
Risteka et al. 2026. “Production Technology and Provenance of Dvaravatī Glass Beads from Khu Bua, Central Thailand: An Archaeometric Study.” Heritage 9, 347.
10.3390/heritage9090347

#SoutheastAsianArchaeology #ThailandArchaeology #Dvaravati #KhuBua #ancienttrade
  • Small finds, big stories this week.⠀
⠀
The latest Southeast Asian Archaeology newsletter focuses on Thailand, with newly reported rock art, worrying news of looting, and two new papers showing what archaeological science can reveal from humble materials.⠀
⠀
One study looks at prehistoric pottery from Don Up Mung in Nong Bua Lamphu, tracing differences in clay composition, firing and production choices. Another follows glass beads from Khu Bua in Ratchaburi into the wider world of South Asian glassmaking and Indian Ocean exchange.⠀
⠀
Also: a LOT of opportunities this week — jobs, scholarships, courses and calls for papers.⠀
⠀
Link in bio⠀
⠀
#SoutheastAsianArchaeology #Archaeology #CulturalHeritage #ArchaeologicalScience
  • Can inscriptions help reconstruct how a kingdom expanded across a landscape?

King Citrasena (Chitrasen, later known as Mahendravarman) ruled Chenla in the late 6th to early 7th centuries, during a period when Chenla’s influence was extending across parts of what are now Cambodia, Laos and northeastern Thailand. His reign is known partly through inscriptions recording religious foundations, royal achievements and other acts of authority. 

Pailoplee and Khatshima map 21 inscriptions from at least 19 locations associated with Citrasena, and asked if people were moving between these places, which routes would they have taken? To explore this, they use Least Cost Path (LCP) modelling in a GIS. LCP calculates routes that minimise the “cost” of movement across terrain.

In archaeology, this can help identify plausible corridors shaped by features such as slopes, river valleys and mountain barriers. These models show how movement could have been structured by the landscape under the assumptions of the model.

Across several scenarios, the reconstructed paths repeatedly concentrate around major river systems—especially the Mun River—and particular passes through the Phnom Dong Rek (Dangrek) mountain range. The authors also compare the modelled network with archaeological sites attributed to Citrasena’s period, many of which fall along these reconstructed corridors.

Where river navigation would have been difficult (such as the Khone Phapheng Falls), the authors propose that Citrasena’s forces may instead have moved overland along riverbanks, using waterways as natural guides through the landscape.

The placement of several inscriptions near river confluences also suggests that these locations may have been important for controlling movement, communication and exchange, not simply access to water.

Reference
Pailoplee, S. & Khatshima, K. 2026. “The role of King Chitrasen (Mahendravarman) in the expansion of the Chenla Kingdom: A study of inscriptions and historical geography.” Social Sciences & Humanities Open 14, 103503.
10.1016/j.ssaho.2026.103503

#SoutheastAsianArchaeology #Cambodia #Thailand #Laos #Chenla
  • Sometimes the biggest archaeological questions depend on evidence we cannot see during excavation.

Microarchaeology investigates archaeological deposits at microscopic and microstratigraphic scales. In Southeast Asia, this can be especially valuable because monsoonal wetness, tropical weathering, intensive land use and complex depositional histories can affect how archaeological evidence survives. 

Researchers can examine the surrounding sediment for traces of past activity and later disturbance. Methods discussed in this new paper include sediment micromorphology, laboratory micro-excavation, high-resolution imaging, FTIR microscopy and SEM-EDS. Depending on the context, microscopic evidence can help identify burning, trampling, plant processing, sediment movement and environmental change. 

The importance of that context is illustrated by work in northern Laos. At Tam Ngu Hao 2, microstratigraphy was used alongside lithological observations and dating to establish the stratigraphic context of Denisovan fossil evidence. At Tam Pà Ling, it has shown potential for investigating environmental seasonality and possible patterns of early modern human presence. These methods help archaeologists understand what happened to a deposit before drawing conclusions from what it contains.
 
The paper also introduces the Australian Microarchaeology and Palaeosciences Facility (AusMAP) and argues for greater collaboration, training and locally based microarchaeological expertise across Southeast Asia. 

Reference:
Hernandez et al. 2026. Scaling down to look further back: Southeast Asia, deep-time science and microarchaeology. SPAFA Journal 10.
10.26721/spafajournal.651369a4y8 

#SoutheastAsianArchaeology #Archaeology #Microarchaeology #Geoarchaeology #ArchaeologicalScience
  • This week on Southeast Asian Archaeology: claims, contexts and careful reading.⠀
⠀
With Malaysia’s National Day, Vietnam’s National Day, Timor-Leste’s Popular Consultation Day, and International Literacy Day all close together, I’m thinking about literacy not just as reading words, but reading evidence: museum labels, old spellings, dates, maps, artefacts, archives, and the occasional viral post with a raised eyebrow.⠀
⠀
The catalyst this week is the recent controversy over historical claims in Malaysia, alongside a timely RSIS piece on how historians, archaeologists, archivists, librarians and curators can help push back against disinformation. Not by attacking people, but by helping everyone ask better questions of the past.⠀
⠀
Also in this week’s issue: Penang’s historical Malay spellings, Cambodia’s new artefact database grant, Singapore’s revised History Gallery, UNESCO’s maritime museum project, new research on Sundadonty, Roti Island, Chenla inscriptions, ancient Myanmar, and more.⠀
⠀
Link in bio.⠀
⠀
#SoutheastAsianArchaeology #Archaeology #Heritage #InformationLiteracy
  • How old are the rock paintings of Mainland Southeast Asia? 🎨🪨

A new study from Mangguan in Yunnan, southwestern China, provides another important piece of the puzzle.

Using uranium-thorium dating, researchers analysed tiny calcite deposits that had formed over the paintings. Because the calcite must be younger than the pigment underneath, the dates provide a minimum age for the art. One deposit covering a human figure shows that the painting was already there at least 4,220 years ago.

Mangguan is particularly interesting because it lies only about 15 km from the better-known Cangyuan rock art complex. The two have stylistic similarities and overlapping dates, suggesting they formed part of a broader regional rock art tradition, a comparison can be taken farther south.

The rock paintings at Pha Taem in Luang Prabang, Laos, have previously been compared with Cangyuan, raising intriguing questions about relationships between the rock art traditions of southwestern China and Mainland Southeast Asia.

Most rock art in Mainland Southeast Asia remains poorly dated, so dates like those from Mangguan give us increasingly useful chronological anchors for thinking about these connections.

References:
Wu, Y. et al. 2026. U-Th dating of rock paintings in southwestern China: minimum age of ~4.2 ka BP at the Mangguan site. Journal of Archaeological Science: Reports 74, 105987. DOI: 10.1016/j.jasrep.2026.105987.

Bo, X. 2020. On the relationship between the Cangyuan rock art in Yunnan, China, and the Pha Taem rock art in Laos. Rock Art Research 37(2).

Tan, N.H. 2018. The Cliff Paintings of Pha Taem, Luang Prabang, Lao PDR. Rock Art Research 35(1).

#RockArt #SoutheastAsianArchaeology #Yunnan #China
  • Extraordinary claims about the past can be exciting. But how do we tell an exciting new hypothesis from pseudoarchaeology?

Recent controversy in Malaysia over claims that ancient Malays taught the Romans shipbuilding provides a useful case study. Rather than piling on the person behind the claims, I think there is a more useful question to ask: how would we actually test an idea like this?

Archaeology gives us some simple tools.

Do the dates work? What is the primary evidence? Does the evidence actually demonstrate the connection being claimed? Are there better explanations? And perhaps most importantly: what evidence would make us reject the hypothesis?

Ancient Southeast Asians really were sophisticated seafarers. Srivijaya really was one of Asia’s great maritime powers. Sungai Batu really does preserve remarkable evidence for early iron production.

None of those achievements needs embellishment to make Southeast Asian archaeology extraordinary.

Swipe through for five questions you can use the next time you encounter an astonishing claim about the ancient past.

🚩 Remember: possibility is not evidence, similarity does not necessarily mean transmission, and extraordinary claims still have to survive ordinary archaeological scrutiny.

Read more about the archaeology behind these claims in this week’s Southeast Asian Archaeology Newsletter.

#SoutheastAsianArchaeology #Pseudoarchaeology #Malaysia #MaritimeArchaeology #MediaLiteracy
  • A 4,000-year-old painted stone from Wetar Island may change how we understand the Austronesian story.⠀
⠀
Archaeologists excavating Huknaur 1 in Southeast Indonesia found a painted plaque with a red sun-ray motif linked to the Austronesian Painting Tradition — a wider visual tradition known from eastern Indonesia and nearby islands.⠀
⠀
What makes this find so important is that the plaque appears to be older than the first pottery at the site. That means a shared symbolic tradition may have been present before the full Neolithic package usually associated with Austronesian expansion. This discovery suggests that ideas, symbols, and identity may have travelled ahead of pottery.⠀
⠀
It is a reminder that the spread of people goes beyond tools, crops, or ceramics, and may also have been about belief, belonging, and a shared visual language carried across the sea.⠀
⠀
Swipe through to see why this small object has such big implications.⠀
⠀
Reference:⠀
O’Connor, S., Kealy, S., Kaharudin, H.A.F., et al. (2026). 4000-year-old painted plaque from Southeast Indonesia reveals Austronesian Painting Tradition preceded Neolithic pottery. PNAS 123(34): e2611580123.⠀
⠀
#SoutheastAsianArchaeology #RockArt #Austronesian #Indonesia #Wetar #SoutheastAsia #IslandSoutheastAsia #AustronesianPaintingTradition
  • Plaques, Ponds and Provenance⠀
⠀
This week’s newsletter begins with a 4,000-year-old painted plaque from Wetar Island — a small object with a big story.⠀
⠀
The plaque carries a red sun-like motif linked to the Austronesian Painting Tradition, and it appears before pottery at the site. That suggests visual symbols and shared ideas may have moved through maritime Southeast Asia before some of the usual archaeological markers we associate with Austronesian expansion.⠀
⠀
Also this week: archaeology beneath Angkor’s Sras Srang, suspected Ban Chiang artefacts offered for return from Switzerland, and more heritage news from across the region.⠀
⠀
Link in bio.
Tuesday, September 15, 2026
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The ancient script of Southeast Asia – Part 2

20 June 2007
in Indonesia, Malaysia, Singapore
Tags: Bali (island and province)documentary heritageepigraphyexhibitionsinscriptionIslamJawi scriptMajapahit (kingdom)National Library of IndonesiaNational Library of SingaporePararaton (literary work)Singapore StoneSinghasari (kingdom)Singosari (district)Terengganu (state)Terengganu Inscription StoneTerengganu Sultanate
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The ancient script of Southeast Asia – Part 2

In this second part of the Ancient Script of Southeast Asia (click here for part 1), we’ll explore two more exhibits from the Aksara: The Passage of Malay Scripts exhibition at the National Library of Singapore. These two pieces are from Terengganu in Malaysia, and Java in Indonesia.

The first exhibit, the Terengganu Scripted Stone, stands at the mouth entrance between the Sacred Writings gallery and the Islamic gallery. Anyone who’s visited the Terengannu State Museum (where the original sits) or the National History Museum in Kuala Lumpur would instantly recognise this Terengganu Stone. I hear it also features in the Malaysian history textbooks as well.

Discovered in the late 19th century, the Terengganu Inscribed Stone, or Batu Bersurat, dates to the 14th century and is the oldest evidence for Islam in Malaysia. The script used is Jawi while the language is Malay, and the inscription describes a set of Islamic laws, as well as proclaiming Islam as the state religion. As to which state this may be remains unclear – the region of Terengganu was known to be under the influence of Srivijaya as late as the 13th century, while the Terengganu Sultanate only dates as far back as the 18th century. The stone is inscribed on four sides, although it probably would have been larger – as you can guess, the top portion of the stone has been broken off and is probably lost for all time…

I was surprised that these “venetian blinds” were not mentioned in the exhibition guidebook. While they may look like a set of ancient venetian blinds, they are actually a collected set of palm leaves on which a Balinese script is written. This is the Pararaton, or the Javanese Book of Kings, which is on loan from the National Library of Indonesia. Given that the Pararaton was written in palm leaves, I was surprised to see a copy in such good condition.

Here’s a closer look at the Pararaton and the Balinese script. As one can guess from the name, the Javanese Book of Kings describes the events during the rule of the kings of the Singosari kngdom and Majapahit Empire which was centred in Java. Although the date of this particular copy is unknown, the Pararaton was first written at the end of the 15th century. Like its Malay counterpart the Sejarah Melayu (the Malay Annals), the Pararaton is a mix of myth, legend and historical events, which make some of its contents suspect when using it as a source for historical events. Unlike the Malay Annals, the Pararaton is made more difficult to read accurately because the record of kings and nobility mentioned in it are referred to by title rather than name!

Strangely enough, the Aksara exhibition did not feature the only ancient inscription from Singapore: the Singapore Stone. The Singapore Stone is a sad page from the local book of archaeology: this inscribed boulder once stood at the mouth of the Singapore River and may have potentially been the very same stone mentioned in the Malay Annals, but early in Singapore’s modern history, the British decided to blow up the stone in order to widen the mouth of the Singapore river. Only fragments of the stone remain, one of which is exhibited in the permanent collection of the National Museum of Singapre and to this date remains undeciphered.

Well, these are only some of the highlights from the Aksara: The Passage of Malay Scripts exhibition going on at the Singapore National Library. I’ve only chosen to focus on some of the ancient inscriptions, and there are many more ancient examples of writing, as well as galleries featuring other Malay writings in more modern times. The exhibition finishes its run at the end of this month, so if you’re in Singapore, don’t miss this opportunity to catch it! Go now before it’s too late! (And don’t forget to catch the Saturday guided tours at noon and 1 pm!)

SEAArch would like to thank the National Library Board, Singapore for the permission to take photographs in this exhibition.
Books featuring ancient Southeast Asian scripts and inscriptions:
– Uncovering Southeast Asia’s Past: Selected Papers from the 10th International Conference of the European Association of Southeast Asian Archaeologists by E. A. Bacus, I. Glover and V. C. Pigott (Eds)
– Southeast Asia: From Prehistory to History by P. S. Bellwood and I. Glover (Eds)
– The Pararaton by I Gusti Putu Phalgunadi

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Comments 1

  1. sundalander says:
    16 years ago

    Pararaton is one book that became the source of the history of the kingdoms in Java, especially Singhasari up to the Majapahit era. But, the contents of Pararaton very subjective. Contains more of the glory of each dynasty was in power at that time.

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