Fig. 3.

The record of impact craters preserved in Earth’s continental crust with formation ages known to within $\pm$75 My (1-$\sigma$) from the PASSC database (42). (A) Absolute crater counts (left axis) for several size ranges tallied in 100-My bins over the past 2.5 Ga, plotted alongside global exposed bedrock area in ${\mathrm{k}\mathrm{m}}^2$/y (right axis) (43). (B) Apparent impact cratering rate per unit bedrock area area tallied in 100-My bins for crater diameters from 2 km to $>$100 km.