Earthworks in Amazonia (IMAGE) University of Helsinki Caption Sá and Seu Chiquinho sites featuring circular, square, and U-shaped earthworks. Credit Photographer: Sanna Saunaluoma Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.