OBSERVATIONS AND EXPERIMENTS ON JOINT PEANES 59 
One of the best faults seen in the Ithaca region is in the Hamilton 
shales where Salmon Creek falls over the Tully limestone back of 
Ludlowville. It passes around the base of the fall, just above the 
level of the pool, disappears beneath débris, then reappears and 
AALS 
Fic. 2.—Right-hand continuation of the faults shown in Fig. 1. The head of the 
hammer shows the movement along the upper fault. 
continues downstream just above the creek bed for many rods. It 
is made conspicuous by stream erosion along the fault line. 
To casual observation these faults look like weak, slightly 
weathered bedding lines. Inspection shows the displacement of 
the joints across them and where they are exposed to stream or 
