290 



AUGUST F. FOERSTE 



Fig. 1. — View of ripple-marked limestone in bed of Elk Run, looking northward 

 toward abutment of road bridge. The appearance of strong contrast in the slope on 

 opposite sides of the ripples is due to the dip of the rock toward the right causing the 

 water to rise higher on the left side of the crests. In reality, the difference in slope on 

 the two sides is small. 



Fig. 2. — View at the same locality, looking northeast across the stream, 

 also Fig. 2, on p. 460 in Journal of Geology, XXIV, No. 5 (1916). 



See 



