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Ring ditches
investigator have find that earthwork , dwell of an array of solid , straight and ringlike ditch that dot the Bolivian and Brazilian Amazon exist before the rain forest sprout up . show here , a band ditch next to Laguna Granja in the Amazon of northeastern Bolivia . [ record full story ]
Man-made structures
scientist are n’t sure the use of these human - made earthen structures of the Amazon , with ideas ranging from their role in defense , drain or even ceremonial / religious purposes . Here , one of the ringlike ditches in the Amazon of Boliva . [ Read full story ]
Mysterious structures
But how were these social structure create ? For some time , archaeologists had thought prehistoric people scarcely touched the Amazon landscape before Christopher Columbus arrive in the Americas in 1492 . Then in the 1980s , deforestation revealed these monumental earthworks sweep some 16 feet ( 5 meters ) wide and often just as mysterious . Here , one such ringlike ditch in the Bolivian Amazon . [ Read full account ]
Altering a landscape
The universe of these structures ( shown here ) suggested the people perhaps did " touch " the landscape painting more deeply . New inquiry , elaborated July 7 , 2014 , in the journal Proceedings of the National Academy of Sciences , drive to estimate how prehistoric hoi polloi altered the landscape here before the Europeans make it . [ Read full story ]
Amazon fieldwork
Here the investigator and field guides prepare their boat to one of the lake sites , where they canvas deposit marrow for ancient pollen grain .
Amazon boating
To picture our if the Amazonians had a major impact on the forests , research worker , including John Francis Carson ( shown here ) examined sediment cores from two lake in the Amazon of northeastern Bolivia . express here , the larger of the two lake called Laguna Oricore . ( They also bet at sediment from the small lake , Laguna Granja . [ Read full chronicle ]
Looking for pollen grains
Carson and his co-worker ( with plain guide who are picture here ) took sediment cores from the two Bolivian lake , looking for ancient pollen grain and oxford grey that might reveal the climate that existed as far back as 6,000 years ago .
Amazon campsite
Here the researcher ( F. Mayle , J. Carson and J.D. Soto ) , as well as Bolivian field guidebook / rangers sit at their campsite in the Bolivian Amazon .
