We thank Aljawadi (1986) for his comments regarding our paper (Meyer and Nederlof, 1984). He is quite correct in pointing out that we had somehow “flipped” between sonic velocity and sonic transit time.

The first sentence of our abstract (p. 121) should read: “Source rock formations generally show a lower density, a higher sonic transit time, and a higher resistivity…” On page 122, under the section “Sonic Logs,” the second sentence should read, “a relative increase in sonic transit time.” Also, the caption to Figure 2 (p. 123) should read: “Resistivity is only marginally higher than the overlying...

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