RIPPLE-MARKS IN OHIO LIMESTONES 



461 



the valley of the stream, is a ripple-marked layer. The ripple- 

 marks are not so clearly defined as in the layers farther up the 

 stream; but they apparently run about north and south. Loose 

 blocks of limestone containing pebbles were noted at this locality; 

 but the layer was not located in place. Probably this is the 

 locality described by Dr. Foerste when he says, "Within half a 



Fig. 3. — View of ripple-marked bed of Elk Run from the highway bridge looking 

 upstream, with the railway trestle in the distance. Photograph by C. S. Prosser. 



mile of the bridge, farther down, opposite a house on the east bank, 

 plenty of pebbles occur in the rock." 1 Farther down the stream, 

 below the next house on its western side and a ford, is a still lower 

 layer, with not very clear ripple-marks. 



As noted above, the ripple-marks in the limestones along this 

 stream were first described by Dr. Foerste as wave-marks on 

 Elk Horn Creek. 2 



Cherry Fork. — Ripple-marks in the Upper Richmond were 

 also seen in the bed of Cherry Fork, below the highway bridge at 



1 Op. ciL, p. 59. 2 Ibid., pp. 58-60. 



