Table 1

Terrigenous sedimentary rock abundance (106 km3/my) over the Phanerozoic. ferosion(t) = [meas(ΔV/Δt)/expon(ΔV/Δt)] where expon represents the value calculated from an exponential fit to the ΔV/Δt data (see fig. 1). fR(t) = [ferosion(t)/1.58]2/3 (see text). ΔV/Δt values from Ronov (1993). The value for the Pliocene is not used in the modeling (see text). Ages from Gradstein and Ogg (1996)