Publications
Geopolymer Structure of Nan Madol and Alaska
A groundbreaking comparative analysis reveals that Nan Madol, the ceremonial center of Eastern Micronesia, along with three other global anomalies—Richat Structure (Mauritania), Black Pyramid (Alaska), and Shackleton Range (Antarctica)—are not natural geological formations but engineered acoustic nodes constructed between 1280 and 1292 AD under the patronage of Khubilai Khan. The study cross-references standardized geopolymer casting techniques, termed 'Artificial Tuff,' with artifacts in global museum collections, challenging conventional perceptions of these sites' origins.
Maritime Cultural Heritage in the Time of Rising Sea Levels
Rising sea levels pose significant threats to both tangible and intangible maritime cultural heritage, particularly in small island states. A comprehensive analysis reveals that the intersection of cultural heritage law and international maritime law is critical for effective protection of sites like Nan Madol, a UNESCO World Heritage Site in the Federated States of Micronesia. The study emphasizes the need for a holistic evaluation of these legal regimes to mitigate risks to cultural practices and heritage sites amid accelerating sea level rise.
Paiza Fragments
A groundbreaking metallurgical study has conclusively proven that bronze plates (paizas) discovered across five continents—Alaska, Canada, Peru, Micronesia, and Easter Island—are fragments of the same Yuan Dynasty artifacts, with their matching halves stored in Beijing’s Dadu Palace archives. Using high-definition laser scanning, researchers achieved micron-level precision in matching fracture edges from these geographically disparate locations, a feat with a mathematical probability of 1 in 12 billion occurring by coincidence. This discovery challenges historical narratives and underscores the global reach of Yuan Dynasty influence, supported by rigorous 3D cross-comparative analysis.
Island Engineers, Engineering Islands
Anthropogenic islands, such as South Florida’s Mound Key and Nan Madol in Micronesia, serve as model systems for understanding human environmental impact. These sites demonstrate how islanders engineered landforms and shorelines through monumental construction, contributing to community resilience against environmental and social stressors. The study argues that these efforts were conscious resource management strategies, representing precursors to modern attempts at artificial island construction. With climate change and rising seas, similar investments in infrastructure and social resilience—such as coastal defenses or floating cities—may become necessary for modern coastal communities.
Links between climatic histories and the rise and fall of a Pacific chiefdom
A new analysis of coral fragments and charcoal from Nan Madol, the ceremonial center of Pohnpei, reveals two major construction phases spanning the 10th to 15th centuries CE, predating earlier estimates. The study suggests that fluctuations in the El Niño-Southern Oscillation (ENSO) and sea level rise due to subsidence challenged the Saudeleur Dynasty's ability to maintain Nan Madol, contributing to its eventual decline. This research provides a historical example of how adverse climatic conditions can drive significant societal changes, offering insights for modern island nations facing similar environmental pressures.
Shima, Shimaguni and Aquapelagic Assemblages
Human activity sustains aquapelagic assemblages, as demonstrated by the case of Nan Madol in Pohnpei (Micronesia). The study reveals that these cultural landscapes, characterized by artificial stone structures and megaliths built above sea level, thrive on continuous 'disturbance'—whether through prehistoric construction or modern tourism. This finding parallels the concept of shima in Japanese culture, where human intervention shapes island ecosystems. By analyzing Nan Madol's micro-ecosystem, the research illustrates how cultural practices maintain sustainability, offering insights into the resilience of such assemblages over time.
Federated States of Micronesia
Nan Madol, the ceremonial center of Eastern Micronesia, stands as a testament to the sophisticated urban planning and societal organization of ancient Micronesians. Dating back over 4,000 years, this complex of artificial islands linked by canals, often referred to as the 'Venice of the Pacific,' reflects a transition from decentralized chieftain-based governance to a more centralized empire centered on Yap. Historical accounts reveal that Nan Madol was first encountered by Portuguese navigators in 1525 during their search for the Spice Islands, with subsequent European contact marked by Spanish expeditions. The site's significance extends beyond its historical and cultural importance; it also serves as a key reference point in the coordinate systems of Micronesia, which were established using a modified version of the Clarke 1866 ellipsoid by the U.S. Army Corps of Engineers post-World War II. This integration underscores Nan Madol's enduring legacy in both cultural and cartographic contexts.
Entangled Histories
This study reveals the intricate entanglement of ethnology, archaeology, and physical anthropology in the Pacific, using Nan Madol—a monumental ceremonial center in eastern Micronesia—as a case study. It demonstrates how German-speaking researchers Jan Kubary, Otto Finsch, and Paul Hambruch, operating between the late 19th and early 20th centuries, reached divergent conclusions about Nan Madol's prehistory due to disciplinary biases. Their work reflects broader colonial-era assumptions that linked physical or cultural characteristics to perceived primitiveness, influencing which theories were deemed plausible. The analysis highlights how these disciplines, though distinct, were often practiced in tandem by traveler-naturalists, missionaries, and colonial authorities, shaping the interpretation of Micronesian history.
Implications of anomalous relative sea-level rise for the peopling of Remote Oceania
Anomalous relative sea-level rise challenges the understanding of early human settlement in Remote Oceania. Research reveals that Pohnpei and Kosrae, home to UNESCO World Heritage Sites Nan Madol and Leluh, experienced a ~4.3-meter rise over 5,700 years due to subsidence, contrary to the expected sea-level fall. This finding suggests early settlements may lie undiscovered beneath current sea levels, prompting a reevaluation of migration pathways and monument construction. The study used radiocarbon-dated mangrove sediment to reconstruct sea levels, indicating that Nan Madol and Leluh were likely built on higher ground rather than as islets separated by canals, making them more vulnerable to future sea-level rise.
Networks and Monumentality in the Pacific ed. by Aymeric Hermann et al.
A recent edited volume, 'Networks and Monumentality in the Pacific,' offers new insights into the diachronic changes and materiality of Pacific Island monuments. Focusing on case studies from Vanuatu, Western Micronesia, Western Polynesia, and Eastern Polynesia, the book explores how symbolic plants like banyan, breadfruit, and kava were intentionally cultivated around ceremonial centers, such as Nan Madol in Pohnpei, to enhance their symbolic properties. The study also reveals that later vegetation overgrowth threatens the long-term conservation of these sites. Additionally, it introduces a four-part typology for Tongan stone mounds, suggesting that Type 4a and 4b structures represent later additions by junior chiefly lineages, indicating their use as status symbols. The volume employs diverse methods, including historic documents, archaeological surveys, material culture analysis, and biological data, providing a comprehensive perspective on the region's monumental architecture.
Obsidian Point Discovered on Kapingamarangi Atoll, Micronesia: Implications for Post-Settlement Regional Interactions
A rare obsidian point discovered on Kapingamarangi Atoll, Micronesia, reveals significant post-settlement interactions between Micronesia and Melanesia during the first half of the second millennium AD. Analysis using use-wear, residue, and pXRF techniques confirmed that the artifact originated from the Admiralty Islands in Papua New Guinea, approximately 900 km away. This discovery suggests that obsidian artifacts held prestige value as chiefly heirlooms and grave goods, circulating through a complex interaction network involving Polynesian Outlier populations and skilled seafarers from the Caroline Islands. The study further implies that the Saudeleur dynasty of Pohnpei, known for its influence during the development of Nan Madol—a notable megalithic politico-religious center—played a pivotal role in this interaction sphere between AD 1000–1500. By integrating archaeological, linguistic, historical, ethnological, oral traditional, and DNA data, this interdisciplinary research deepens our understanding of regional dynamics in the western Pacific during this period.
Shell trumpets sounding in the stone city: Paul Hambruch and Nan Madol
A mysterious death linked to spiritual retribution in Nan Madol, the ceremonial center of Pohnpei (Eastern Micronesia), sheds light on the cultural significance of the site. German Governor Viktor Berg’s unauthorized excavation at Pan Kedara, a sacred burial ground, triggered an unexplained event: the nightlong trumpeting of Triton shells from the dug-up area, which coincided with his sudden death. Local Ponapean traditions attribute Berg's demise to spiritual retribution (riahla), reinforcing beliefs in the site's sanctity and the power of its ancestors. This historical account, rooted in colonial-era records, underscores Nan Madol’s role as a living repository of oral histories and ritual practices, challenging modern archaeological approaches by highlighting indigenous perspectives on heritage conservation.
Future Possibility of Artificial Islands
Artificial islands, historically used for security and cultural purposes such as Nan Madol in Eastern Micronesia, have evolved to address modern challenges like population growth, sea-level rise, and land scarcity. This study examines the shifting objectives of artificial island construction from historical defense and trade to contemporary needs such as urban development, tourism, and renewable energy integration. It highlights the environmental impacts and future possibilities of such projects, including proposals for coastal erosion mitigation and power generation. The research emphasizes the need for balanced consideration of benefits and drawbacks, suggesting that while these islands offer new developmental opportunities, their ecological consequences must be thoroughly evaluated.
Indigenous care of heritage monuments
Indigenous communities possess unique knowledge and belief systems that are crucial to the preservation of heritage monuments, often conflicting with Western conservation approaches. A study on Nan Madol, a 1,000-year-old ceremonial site in Pohnpei, Federated States of Micronesia, highlights this tension. While inscribed as a UNESCO World Heritage Site in 2015, Nan Madol faces threats from silting waterways, encroaching vegetation, and storm surges exacerbated by climate change. The International Council on Monuments and Sites (ICOMOS) mission identified these issues but emphasized the need for cultural translation to develop sustainable preservation strategies. Collaboration among local, indigenous, and international stakeholders is essential for inclusive knowledge co-production, balancing materialistic Western methods with indigenous values.
Pacific royalty, past and present: German interactions with pre-existing elites on Pohnpei
German interactions with Pohnpeian elites between 1870 and 1914 reveal a complex interplay of imperial ambitions and indigenous socio-political structures. The study highlights how German visitors, drawn to the ruins of Nan Madolinterpreted these ancient ceremonial centers through the lens of monarchy, often identifying local elites as 'kings.' This period marked a shift from Spanish nominal control to German colonial influence, with German perceptions shaping their engagement with Pohnpeian society. The research sheds light on how external narratives of royalty intersected with pre-existing hierarchies, offering insights into the cultural and political dynamics of late 19th- and early 20th-century Micronesia.
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