370 CHESTER W. WASHBURNE 



important part of anticlinal accumulation is due to migration 

 up the slope of the sand. The experiments are important in 

 showing the difficulty or impossibility of such migration under 

 the low temperatures of very shallow depths. The experiments 

 by McCoy show that we should give more thought to the impor- 

 tance of anticlinal crevices in shale. 



