Figure F26. Plots of detrended color reflectance vs. age for the Pliocene-Pleistocene (0.6-2.5 Ma) with superimposed predicted angle of obliquity (data from Laskar, 1990) for the same interval. Color reflectance was detrended by taking a curve of mean reflectance and subtracting the point-to-point deviation of reflectance from it. Reflectance values were collected at 2.5-cm intervals, which is ~1 sample/1.5 k.y. on average for the interval selected. Note the approximate correspondence between the two curves, suggesting that obliquity drove the observed cyclicity.

Figure F26. Plots of detrended color reflectance vs. age for the Pliocene-Pleistocene (0.6-2.5 Ma) with superimposed predicted angle of obliquity (data from Laskar, 1990) for the same interval. Color reflectance was detrended by taking a curve of mean reflectance and subtracting the point-to-point deviation of reflectance from it. Reflectance values were collected at 2.5-cm intervals, which is ~1 sample/1.5 k.y. on average for the interval selected. Note the approximate correspondence between the two curves, suggesting that obliquity drove the observed cyclicity.