216 



A short distance north of Monticello are sandy ridges which doubtless 

 marked the southern limit of the glacial lake, so that this town is near 

 the upper end of this part of the valley, although the gorge-like character 

 of the valley has extended up to the town of Buffalo. 



At Monticello the river flows in a valley not over half a mile wide and 

 about eighty feet deep. Farther down the valley widens and deepens 

 so that at some points the valley is a mile wide and the bluffs about one 

 hundred feet in height. The only exposure of bedrock, New Albany shale 

 and Devonian limestone, in this part of the valley is found a short distance 

 above Monticello. Nowhere in the valley were wells found that were cut 

 down to bedrock. The slope is great, the river falling almost 100 feet 

 from Monticello to the mouth. 



At this time no explanation as to the causes of the existing features is 

 offered, the writer preferring to present these conditions for intei-pretation 

 by more competent members of the Academy. This study of the Tippe- 

 canoe River will be continued, and some results of this work may be pre- 

 sented at future meetings. 



Concerning Well-Defined Ripple Marks in Hudson River 

 Limestone, Richmond, Indiana. 



Joseph Moore and Allen D. Hole. 



In the Proceedings of the Indiana Academy of Science for 1894, page 

 53, Mr. W. P. Shannon, under the title, "Wave Marks on Cincinnati Lime- 

 stone," gives an interesting description of undulations in strata in the 

 southwest part of Franklin County, Indiana. The present paper is a rec- 

 ord of similar phenomena in Wayne County, Indiana. 



In the spring of 1901 Prof. Joseph Moore observed what appear to be 

 well-defined ripple marks in an exposed stratum of Hudson River lime- 

 stone. The exposure occurs about five miles southwest from Richmond, 

 Indiana, in the bed of a small tributary of the Whitewater River. The 

 stream at this point flows approximately N. 35° E., and the series of un- 

 dulations, which will be called "ripple marks" in this paper, are nearly, 

 though not exactly, parallel, and lie in a direction about N. 72° 30' E. 

 This direction is the mean of the measured direction of several axes. The 

 width of the stream is from ten to fifteen feet, and the ripple mai'ks 

 are exposed more or less plainly for a distance of two hundred feet in the 

 bed of the stream. 



