RIPPLE-MARKS IN OHIO LIMESTONES 475 



On September 19, 1914, a considerable area in the new (north- 

 west) part of the quarry had been stripped of soil and this upper 

 surface of the limestone was beautifully glaciated. It was all worn 

 smooth and marked with striae of various degrees of strength; 

 but part of them are rather strong. The direction of the striae 

 was determined at different places on this surface and in all cases 

 they ran N. ioo° W. (W. io° S.) and N. 8o° E. (E. io° N.). 



