472 



SEISMIC METHODS 



[Chap. 9 



Table 52 

 IGNE0US12 AND METAMORPHIC ROCKS 



12 Rook types arranged in order of decreasing acidity. 



Table 53 

 ELASTIC VELOCITIES OF TRANSVERSE WAVES 



Formation 



Tishomingo gran- 

 ite 



Rockport granite 



Locality 



Tishomingo, 

 Okla. 



Massachusetts 



Investigatob 



Weatherby, 

 Born, & 

 Harding 



Leet 



Transvbbse Wave Velocity 



m/sec. 



2,130-2,420 



2,700 



ft. /sec. 



7,000-7,950 



8,858 



