The data of Jenny and Leonard (1934) strongly influence the worldwide compilation of Retallack (1994b). These data, in particular those with a depth to carbonate horizon (D) > 100 cm (n = 35), anchor the regression of Retallack (1994b). Removal of these 35 data points, which decreases his sample size by only 11%, reduces the r2 of the regression from 0.62 to 0.44 (Royer, 1999). Removal of all D > 100 cm data from the data set of Retallack (1994b) (n = 67) further reduces the r2 to 0.38. Most studies applying this modern...

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