Encountering the Uncremated Dead: A Thermodynamic, Silvicultural, and Spatial Model of Mortuary Visibility in the Southern Carpathian Basin

The Problem Large prehistoric and protohistoric settlements across the Carpathian Basin and Danubian lowlands rarely have matching cemeteries. For decades, archaeologists explained this gap by assuming that entire populations were cremated on open-air wooden pyres and that their ashes were scattered into rivers or top-soil. Recently, Molloy et al. (2026) showed that unburnt human bones were actually common inside settlement ditches and storage pits. However, no study has calculated the fuel and heat required to cremate an entire population on open pyres. Method and Findings This paper tests the physical limits of open-air cremation using heat-transfer thermodynamics, wood anatomy (anthracology), and historical mortality records across four micro-regions of Southeastern Europe: Pyre Heat Loss: Turning human bone into white calcined ash requires sustained temperatures of 750°C to 900°C for 2.5 to 4 hours. Because water makes up 65% of a demographic cohort body (50 kg average), evaporating that water consumes 85 MJ of heat. On an open outdoor pyre, 98.1% of the fire's heat escapes into the sky column and surrounding air. Only 1.90% of the wood's energy actually enters the body. Reaching full calcination requires 350 to 500 kg of dry hardwood per corpse. Local Timber Shortages: Lowland marsh settlements like Židovar and Vatin in the southern Banat were surrounded by willow and poplar (Salix and Populus). These softwoods burn fast with low heat and collapse into cold ash before bone can calcine. Dense oak timber had to be hauled 20 to 25 km across seasonal marshes from the Vršac Mountains. Furthermore, plant remains from Židovar show that local residents peeled and roasted acorns for human food. Cutting down food-producing oak forests to burn corpses when a village of 350 people already needed 480 tons of firewood a year for winter heating and smithing makes no economic sense. Mortality and Fuel Audits: Parish death registers from the Historical Archives of Bela Crkva for 18th-century Banat villages (Orešac, Izbište, Zagajica, and Straža) show a pre-industrial death rate of 40 to 45 per 1,000 people per year. Applying this rate to the 150-year Bastarnic settlement network east of the Carpathians yields 60,000 to 150,000 dead. Cremating them would have required 22,800 to 57,000 metric tons of hardwood (45,600 to 114,000 ox-cart loads), yet excavated graves account for less than 1% of the population. Where the Dead Were Buried: Common farmers did not waste fertile flat chernozem plowland on cemeteries, and they did not bury their dead inside fortified grain citadels like Židovar. Instead, they buried unburnt bodies in shallow dirt graves on steep, unplowable loess slopes, ravine edges, and older burial mounds (humke). Over centuries, acidic groundwater, bacterial decay, and 40-cm deep tractor plowing destroyed these shallow skeletons, leaving behind only durable calcined bone scraps from a small number of elite cremations. The paper concludes with a field guide for using magnetometry, ground-penetrating radar (GPR), and electrical resistivity to locate surviving unburnt graves along unplowed terrace slopes at Židovar and Vatin.