The figure above is copied from the data of Martinson et al., 1987. The values for the Y axis are not actual δ^{18}O values. They are standardized scores, computed by subtracting the average from each δ^{18}O, and dividing by the standard deviation. |
standardized score standard deviation. |
"Real" δ^{18}O measurements of foraminifera are seldom negative. Ordinarily, they are more positive and less posative, with more positive (larger) values being typical of glacials. Example ODP 847 |