Long+Before+Making+Enigmatic+Earthworks%2C+People+Reshaped+Brazil%E2%80%99s+Rain+Forest+-+The+New+York+Times

Overview of Amazon Geoglyphs

  • Massive geometric earthworks discovered in the Amazon rainforest

  • Spread across hundreds of thousands of acres featuring shapes such as circles and squares

  • Dimensions: trenches can be as wide as 12 yards and deep as 13 feet

  • Estimated to have been built up to 2,000 years ago

Discovery and Excavation

  • Ancient structures remained hidden until the 1980s when ranchers cleared land for cattle farming

  • Over 450 geoglyphs identified, primarily located in Acre State, Brazil

Archaeological Significance

  • The discovery challenges the belief that the Amazon rainforest was untouched by human influence before European colonization in the 15th century

  • Purpose of the geoglyphs still unknown, possibly linked to ritual practices

  • Archaeological research reveals insights into the lives of ancient Amazonian inhabitants

Study by Dr. Jennifer Watling

  • Conducted research as a student at the University of Exeter, now at the University of São Paulo, Brazil

  • Focused on the environmental impact of geoglyph builders

  • Study revealed that ancient peoples managed forests sustainably

Environmental History Reconstruction

  • Research team reconstructed a 6,000-year-old environmental history at two geoglyph sites

  • Methods of analysis:

    • Soil sampling

    • Microscopic plant fossils (phytoliths) to understand ancient vegetation

    • Charcoal analysis for evidence of burnings

    • Carbon dating for assessing past vegetation openings

Ancient Agricultural Practices

  • Around 4,000 years ago, ancient peoples began controlled burns in the bamboo-dominated forest

  • Small clearings were made to plant crops like maize and squash

  • Concept of a "prehistoric supermarket" emerged, suggesting organized cultivation of useful tree products

  • Geoglyph construction followed this land management

Implications of Findings

  • Ancient artifacts and layout suggest geoglyphs were not for habitation or military defense but likely for rituals

  • Contrast with modern large-scale deforestation, highlighting sustainable practices of ancient indigenous peoples

  • Ancient peoples practiced a form of agroforestry, creating temporary clearings to sustain valuable plant growth

Connection to Modern Practices

  • Indigenous communities today continue similar sustainable practices in managing forests

  • Modern forest biodiversity is attributed to historical agroforestry practices of the geoglyph builders

  • Dr. Watling's assertion: indigenous communities greatly transformed the Amazon ecosystem over millennia.