Fig 1.
Location of sites in the Eastern Maya lowlands and corresponding bedrock geology (after [95]).
Base map images are the intellectual property of Esri and are used herein under license. Copyright 2020 Esri and its licensors. All rights reserved.
Table 1.
Time periods, associated age ranges, and sample sizes for burials (total n = 114) analyzed in this study.
Fig 2.
Modeled δ34S isoscape for the Eastern Maya lowlands.
Table 2.
Bedrock geology of the study area zones following Cornec (2010).
Table 3.
Mean δ13C, δ15N, and δ34S values by site for Eastern Maya lowlands.
Fig 3.
Eastern lowland human δ13C and δ15N values, with outliers described in text indicated.
Fig 4.
Bullet graph of stable carbon (δ13C) isotope values for human bone collagen.
Data points are shown as circles with the means for each time period indicated by a cross. The bullet graph shows the 80%, 95%, and 99% confidence intervals (CIs; thickest to thinnest bullets) around the mean.
Table 4.
Mean isotopic values for human bone collagen by time period.
Fig 5.
Plot of the mean δ34S values by site and sulfur group.
Data points are shown as circles with the means for each context indicated by a cross. The bullet graph shows the 80%, 95%, and 99% confidence intervals (CIs; thickest to thinnest bullets) around the mean (cross). Statistical outliers indicated by a star.
Fig 6.
Eastern lowland human δ13C and δ34S values plotted by geographic zone.
Open symbols and error bars indicate the mean and standard deviation of δ34S values in each sulfur group.
Fig 7.
Eastern lowland human δ15N and δ34S values plotted by geographic zone.
Open symbols and error bars indicate the mean and standard deviation of δ34S values in each sulfur group.
Table 5.
Summary statistics for δ34S values by statistically identified sulfur groups for the Eastern Maya lowlands.
Fig 8.
Comparison of human 87Sr/86Sr and δ34S values for the Eastern Maya lowlands.
Correlations between 87Sr/86Sr and δ34S and regression lines were calculated only for individuals only identified as “local” in previous strontium-based studies from sample sizes n > 5 (Group 1). Possible origins for non-local individuals are proposed based on published 87Sr/86Sr data (see S2 Table).