466 SEISMIC METHODS [Chap. 9 



clays, and marls; Table 50, those for sandstones and shales; Table 51, the 

 velocities in limestones, anhydrite, salt, and the like; and Table 52 repre- 

 sents longitudinal velocities for igneous and metamorphic rocks. A num- 

 ber of selected values for transverse waves are given in Table 53. Table 54 

 shows some values for Rayleigh waves, and Table 55 contains vertical 

 velocities, that is, longitudinal velocities determined by measuring travel 

 times at right angles to the bedding planes in wells. 



