202 



place, accompanied bj- a rapid evolution of oxygen. The compound itself 

 does not produce such a change, neither does ammonia, but only the solu- 

 tion of the one in the other. It was found that copper sulphate dissolved 

 in ammonia will behave in the same manner. 



Ripple Marks in Hudson Limestone of Jefferson County, 



Indiana. 



Glenn Culbertson. 



In the proceedings of the Indiana Academy of Science for 1901, and in 

 a paper entitled: Concerning Well Defined Ripple Marks in Hudson River 

 Limestone. Richmond. Indiana, Prof. Josepli Moore and Allen D. Hole de- 

 scribe Hudson limestone ripple marks near Richmond, Indiana. 



In this paper I desire to give briefly the location and some points of 

 description of similar markings in the Hudson limestone of Jefferson 

 County, Indiana. In this county, to my knov^'ledge, Hudson limestone 

 ripple marks occur in five widely separated localities and at six different 

 horizons. In all essential points the accurate and full description of the 

 ripple marks at Richmond may be applied to those mentioned in this 

 paper. 



The geographical positions of the Jefferson County markings will be 

 given in the order of their geological horizons, the Clinton limestone' being 

 used as a basis for measiu'ements. Following this a few of the principal 

 points of interest touching the ripple marks will be included. 



The Wolf Run ripple marks are found at the roadside and in the creek 

 bottom within 200 yards of the end of the Ryker's Ridge pike on Wolf 

 Run in Madison Township. In this place there are two quite distinct 

 series of markings. The upper is in a stratum approximately seventy feet 

 below the Clinton outcropping on the neighboring slope. The lower is in 

 a stratum some six or eight inches below the first. The upper series of 

 marks are exposed over a space some 35x8 feet, while the lower is ex- 

 posed over a surface of some three or four square yards. The trend of 

 the crests of the upper marks is N. 70° E., and of the lower N. 50° E., ap- 

 proximately. I say approximately since there are many small irregular- 

 ities in the trend of the crests. These crests are, however, essentially 



