Research Article

Purple Staining of Archaeological Human Bone: An Investigation of Probable Cause and Implications for Other Tissues and Artifacts

Figure 3

A plot of value from the Anselin Local analysis of the spatial arrangement of burials shown in Figure 2. It shows statistically significant ( 5% level) clustered (marked by red) material around the northwest to northeast quadrants of the burials close to the Chapter House foundations and a more dispersed arrangement (marked by green) in the center and south to east quadrant. The clustered zone represents an above average concentration of purple stained bone and the dispersed zone represents a below average concentration assuming a random distribution (marked by yellow).