CONTINENTAL TERRACES AND SUBMARINE VALLEYS I49 



FIGURE 75. DIAGRAM ILLUSTRATING THE KUENEN EXPERIMENT ON 

 SILTY CURRENTS. 



from the right and left, thickening the current and correspond- 

 ingly increasing its velocity. A tongue of the silty water ran 

 down ahead of the more slowly flowing suspension on each 

 side of the tongue. One of these tongues was photographed 

 from above and through the clear overlying water, with the 

 result shown in Figure 77, where faint lines of flow can be 

 discerned. 



Similar suspensions were released after the hard surface of 

 the model was covered with thin layers of clay. When only 

 moderately charged with "silt," the density current became 



