200 



more ancient channel than any of these, however, is found from a to b. 

 This rises on much higher ground at a and though not so well marked 

 as the more recent cliannel its lower course, as it nears b, has become well 

 emphasized by recent drainage of the adjacent country. 



The stream will probably forage its way to all the bounding ridges 

 and denude them — render them bluffs— before cutting its new channel, 

 xy, when it will again leave them to weather themselves into symmetrical 

 shapes, dress in forest verdure and present history as well as future 

 possibilities, which speculation in this age is unable to suggest. 



Notes on the Ordoyician Kocks of Southern Indiana. 

 By Edgar K. Cumings. 



The present paper dealing with the stratigraphy of the Ordovician of 

 Indiana is preliminary to a more complete report on this interesting series 

 of I'ocliS. which the writer has in preparation. In the latter paper an 

 extended discussion of the faunas of these roclis will be possible. At 

 present the study of the large collections obtained is not si fficiently 

 advanced to admit of any such presentation. It is therefore proposed to 

 give here practically nothing but the notes taken in the field, with such 

 supplementary remarks as may seem necessary. 



The work of the Indiana University Geological Survey during the 

 field season of 1900 covered the counties of Dearborn, Switzerland, Ohio 

 and .Jefferson. The following sections were measured and from most 

 of them extensive collections were made: 



Section in Kentucky opposite the mouth of the Miami River (5.9A):* 



Ft. In. 



51 — Covered to top of hill 112 



50 — Fragments of Strophomenoid shells 7 



49— Shale - 1 



48— Limestone. Fragments of Brachiopods 6 



47— Shale 1 



46 — Hard limestone with Bafinesquina 5 



45— Shale 2 4 



44 — Limestone. Rafinesquina abundant 5 



43 — Covered, probably shale 17 6 



'■'This gection in Kentucky is given because it is the farthest east of any section show- 

 ing exposures of rock to river level. 



