BULL. GEOL. SOC. AM. 



VOL. 14, 1902, PL. 21 



Figure 1. — Three Dikes at 4 

 Strike of dikes is across that of enclosing shales 



Figure 2.— Dike at 6 

 Relations of dike to adjacent shale and the slight lateral faulting is shown 



DIKES ON GRAVES CREEK, NEAR ASUNCION, CALIFORNIA 



