Fig. 16

Least-squares linear regression of ⁸⁷Sr/⁸⁶Sr with stratigraphic height measured in meters from datum, which is taken as 0 m at the base of the Castilletes Formation. Symbols distinguish data used in each regression (blue) and those excluded (red) due to concerns about their stratigraphic placement or their anomalous values. The function for deriving the regression is y = −0.0058x + 16.722 (r² = 0.89, n = 21) (color figure online)