Skeletal Biomechanics & Dietary Paleopathology: Pleistocene Dental Wear, Fibrous Diet & Cranial Robusticity

1. Pleistocene Craniometrics & Skeletal Biomechanics: Devil's Lair & Regional Adaptations

The deep-time skeletal biology of First Nations populations in south-western Australia provides definitive osteological evidence of continuous in situ human occupation spanning over 60,000 years.^[1][5] Fossil human remains, dental elements, and stratified occupational sequences discovered at Devil's Lair in the Leeuwin-Naturaliste limestone ridge—dating from beyond 48,000 BP—reveal a population characterised by pronounced cranial robusticity, exceptional musculoskeletal strength, and advanced biomechanical adaptations to high-mobility foraging.^[1][5]

Pleistocene cranial morphologies across Australia exhibit distinctive robust traits: thickened supraorbital tori, pronounced sagittal keeling, thick cranial vault bones (often exceeding 10–12 mm), and expanded mandibular ramus dimensions.^[3][4] Rather than indicating primitive evolutionary stages, modern biomechanical engineering demonstrates that these features represent adaptive craniofacial reinforcements engineered to dissipate extreme bite forces generated during the mastication of tough, fibrous wild foods.^[3][4]

2. Masticatory Mechanics & Attrition Profiles: Phytolith Abrasion from Warrine and By-yu

Paleopathological examinations of prehistoric Indigenous dentitions from Western Australia reveal unique patterns of severe, flat-plane dental wear (attrition and abrasion).^[3][4] Unlike the modern Western dentition, which suffers from high rates of dental caries and malocclusion due to refined sugars and soft carbohydrates, Pleistocene and Holocene Bibbullmun dentitions demonstrate virtually zero dental decay combined with intense, functional tooth wear.^[2][4]

This wear profile was driven by the mechanical mastication of geophytes and fibrous plant tubers—predominantly the Warrine (Dioscorea hastifolia), crushed grass seeds, and processed By-yu (Macrozamia riedlei cycad nuts).^[1][5] Because food preparation involved subterranean roasting in sand-insulated earth ovens (kallang) and grinding on granitic querns, fine micro-silicate particles (sand grains) and endogenous plant phytoliths adhered to food items.^[4][7] The continuous mastication of these abrasive particles acted as a natural polishing agent, grinding dental crowns down to flat, polished dentine surfaces while stimulating secondary dentine growth that sealed the pulp chambers against infection.^[3][4] Furthermore, the teeth functioned routinely as a 'third hand' or vice for softening animal sinew, stripping plant fibers for rope manufacture, and sharpening wooden speartips.^[4]

3. Musculoskeletal Adaptation to Continental Mobility: Cortical Bone Density

Postcranial skeletal remains from the Australian fossil record demonstrate remarkable physical conditioning.^[3][4] Analysis of femoral and tibial cross-sectional geometry reveals high cortical bone thickness and pronounced anteroposterior strengthening (high femoral pilastric index and tibial platycnemia).^[3][4]

These osteological markers reflect a lifetime of vigorous physical activity: running down macropod game (Yongka), traversing dozens of kilometres daily across rugged granitic slopes and sandy coastal dunes, and swimming through turbulent river estuaries.^[4][5] Cortical bone remodeling in response to mechanical loading produced skeletons with exceptional resistance to fractures and degenerative joint disease, far exceeding the bone density of contemporary sedentary urban populations.^[4]

4. Biological Proof of 60,000-Year Evolutionary In Situ Adaptation

Settler-colonial historical narratives have frequently attempted to portray Indigenous Australians as transient newcomers or genetically displaced populations.^[6][7] However, the deep stratigraphic record of Devil's Lair—where humanly worked bone beads, stone tools, and faunal assemblages span continuously across forty millennia of glacial cycles—demonstrates unbroken biological and cultural continuity.^[1][5]

The skeletal biomechanics and dental resilience of the Bibbullmun ancestors reflect an exquisite, co-evolved biological harmony with the harsh, infertile ecology of the Yilgarn Craton.^[4][5] These fossil and archaeological archives provide irrefutable physical proof that the Bibbullmun Sovereign Nation represents an ancient, biologically continuous lineage rooted in this continent since the dawn of modern humanity.^[1][4]