Fig. 14 in How Time Flies for Flies: Diverse Diptera from the Triassic of Virginia and Early Radiation of the Order

Fig. 14. Relative abundance of Diptera through time, as measured by log10 proportion of Diptera specimens among total number of fossil insect specimens from representative, significant deposits (see table 4). Dipteran abundance asymptotes toward modern levels in the Jurassic because of diversification within infraorders.