Reconstruction
At Teotônio, on a high bluff beside a waterfall of the upper Madeira River, archaeologists uncovered evidence that food production in southwestern Amazonia was neither a sudden replacement of foraging nor a simple import from distant farming societies. During the site’s pre-ceramic Massangana occupation, about 6,500–5,500 calibrated years ago—roughly 4,550–3,550 BCE—people cultivated or processed manioc and squash while continuing to fish and collect forest foods. The evidence places Teotônio within a broader southwestern Amazonian region important to the early history of crop domestication, although it does not prove that manioc itself was first domesticated at this particular site.
The archaeological case depends on microscopic and charred plant remains. Researchers identified rare phytoliths attributable to manioc in anthropogenic dark-earth deposits, along with several rind phytoliths from squash. Some squash specimens fall within dimensions associated with domesticated Cucurbita, but the small sample prevents secure species identification. Starch grains confidently identified as Phaseolus beans occurred on three retouched quartz flakes. Earlier Girau deposits contained carbonized root or tuber fragments and phytoliths tentatively attributed to leren, an edible rhizome. These finds document plant use directly; interpreting them as cultivation rests on their archaeological contexts, the presence of domesticates and the ecology of the plants involved.
People at Teotônio ate much more than crops. Charred Brazil-nut shells, palm remains, pequiá and guava show continued reliance on gathered or managed forest resources. The waterfall was also an exceptional fishing location. The resulting economy is best reconstructed as that of hunter-fisher-gardeners who combined aquatic abundance, forest collecting and small-scale cultivation rather than depending exclusively on fields. Archaeologists cannot calculate the crops’ dietary share from the surviving remains.
Preparation is less certain. No manioc starch was found on the 29 analyzed quartz flakes, so these objects cannot be identified as manioc-grater teeth. One unidentified starch type displayed damage consistent with roasting, but its plant source remains unknown. Boiling, roasting, grating or detoxifying manioc cannot therefore be assigned to the site without projecting later practices backward. Even the manioc phytoliths may represent discarded rind, leaves or other processing and cultivation debris rather than a preserved meal.
Teotônio is significant because repeated occupation helped create nutrient-enriched anthropogenic dark earth. Such soil probably provided useful garden niches for demanding introduced crops such as beans and squash, although its exact formation and use remain under study. Manioc later became one of the world’s major tropical staples, prepared as cooked roots, flour, breads, granules and extracted starch. Teotônio supplies an early chapter in that history, not a demonstrated direct lineage to any single modern cassava cuisine.
Historical context
Teotônio was a pre-ceramic riverside settlement area on a bluff approximately 40 metres above the Madeira. The nearby waterfall concentrated fish and forced travelers to carry boats and goods overland, making the location a likely communication and exchange point. Communities were beginning to accumulate anthropogenic dark earth while still relying heavily on palms, nuts, fruits and aquatic resources. Elsewhere in southwestern Amazonia, cultivation had an even greater antiquity: evidence from Bolivia’s Llanos de Moxos places manioc and squash cultivation near the beginning of the Holocene. Teotônio therefore belonged to a long regional history of gardening, mobility and human modification of tropical landscapes.
Evidence
Archaeological
StrongExcavated Girau and Massangana deposits contain lithic artifacts, fire features, plant remains and early anthropogenic dark earth in a stratified pre-ceramic sequence.
Archaeobotanical
StrongSediment phytoliths, artifact starches and floated charred macroremains directly document manioc, squash, beans, roots or tubers, palms, Brazil nuts, pequiá and guava, although identification strength differs among taxa.
Food identification
ModerateManioc is represented by two rare diagnostic phytoliths, and squash by a small number of rind phytoliths; Phaseolus starch identification was considered confident, while leren and some macroremains remain tentative or identifiable only to genus.
Dating
ModerateIn-situ Massangana fire structures date relevant deposits to approximately 5,900–5,643 calibrated BP, within a broader 6,500–5,500 calibrated BP cultivation horizon. Some intrusive ceramics and inverted charcoal dates demonstrate limited post-depositional mixing.
Preparation method
LimitedThe tested flakes yielded bean starch but no manioc starch, ruling them out as demonstrated manioc-grater teeth. Damage on one unidentified starch type is consistent with roasting, but no particular manioc preparation is directly established.
Geographic attribution
StrongThe excavated Teotônio site is securely located on the south bank of the upper Madeira River in present-day Rondônia, Brazil.
Historical interpretation
ProbableCultivation within a mixed hunter-fisher-gardener economy and the use of anthropogenic dark earth as favorable garden space are well-supported interpretations, but crop dependence, field arrangement and domestic context cannot be measured directly.
Visual reconstruction
InterpretiveAny depiction of gardens, houses, crop-processing equipment, clothing or food service would be a reconstruction; the study directly documents deposits, tools and plant traces rather than a complete living scene.
Sources
- 1.Jennifer Watling, Myrtle P. Shock, Guilherme Z. Mongeló, et al. (2018). Direct archaeological evidence for Southwestern Amazonia as an early plant domestication and food production centre. PLOS ONE 13(7): e0199868. doi:10.1371/journal.pone.0199868Primary archaeology
- 2.Kenneth M. Olsen and Barbara A. Schaal (1999). Evidence on the origin of cassava: Phylogeography of Manihot esculenta. Proceedings of the National Academy of Sciences 96(10): 5586–5591. doi:10.1073/pnas.96.10.5586Scientific literature
- 3.Christian Isendahl (2011). The Domestication and Early Spread of Manioc (Manihot esculenta Crantz): A Brief Synthesis. Latin American Antiquity 22(4): 452–468. doi:10.7183/1045-6635.22.4.452Modern synthesis
- 4.Umberto Lombardo, José Iriarte, Lautaro Hilbert, et al. (2020). Early Holocene crop cultivation and landscape modification in Amazonia. Nature 581: 190–193. doi:10.1038/s41586-020-2162-7Scientific literature
- 5.José Iriarte, Sarah Elliott, S. Yoshi Maezumi, et al. (2020). The origins of Amazonian landscapes: Plant cultivation, domestication and the spread of food production in tropical South America. Quaternary Science Reviews 248: 106582. doi:10.1016/j.quascirev.2020.106582Modern synthesis
Limitations
- moderatedate start/date end
The strongest direct Teotônio evidence for manioc and squash cultivation is associated with contexts dated approximately 6,500–5,500 calibrated BP, about 4,550–3,550 BCE. The supplied 4,800–2,500 BCE range is broader and extends roughly a millennium later than the published cultivation horizon.
- moderatetitle/description
Teotônio provides direct evidence of manioc presence and probable cultivation, but it does not directly demonstrate that manioc was domesticated at the site. Attribution of domestication belongs to the wider southern or southwestern Amazonian region and relies substantially on genetic and comparative evidence.
- minoris technology
Cultivation, anthropogenic dark-earth formation and landscape management can be treated as technologies in a broad sense, but the card does not document a single discrete invented device or fully reconstructed cultivation technique.
