Nov., 1917] Concretionary Forms 13 



of pressure and movement, either the isolith upward or the 

 ledge downward. Can such occurrence be of use and value to 

 the pressure theory? 



The arches of the concretionary "waffles" sometimes 

 become so high, large and shaped, as to be suggestive of a 

 transition into the "pebble" form. 



In the gorge of the Cuyahoga River near Akron, just below 

 the electric power-house dam, in the bluish sandstone, I found 

 two ordinary and familiar round concretions about eight (8) 

 inches each in diameter and not requiring more than twenty (20) 

 inches of space in length over all. Midway between these, I 

 found a concretion very similar to the "cup and cone" type. 

 It has a cap, a stem or cone and an oval end suggestive of a 

 cavity. If this similarity has merit, then we have joined an 

 additional form to the series. 



These observations are presented in the hope that they will 

 be found to be clews of some value and assistance in arriving at 

 a full and complete understanding of the concretionary force 

 and the forms resulting from its operation. 



We now see that the Greenfield Limestone has features of 

 intense interest which its usual regularity would seem to 

 preclude. 



