Cluster analysis of shellmound similarities.
Age ranges (green letters) based on otolith data. Calibration was performed using Marine13  in the 2-sigma range. The overall ΔR was found to be -56.5 to 120.5 . The results at specific sites are as follows: ΔR Saquarema: -272 to -8  and ΔR Manitiba: -224 to 60 . Question marks indicate that radiocarbon dating of otoliths was not available; consequently, we plot shellmound age ranges (red numbers) based on charcoal and shell analyses ([29,102]; personal communication).