THE PREGLACIAL DRAINAGE OF OHIO. 13- 



sidered as only fairly begun and this report is scarcely more- 

 than a preliminary statement which it is hoped will give a. 

 general view of the field and serve as a stimulus to more thor- 

 ough and detailed work. Many interesting and important ques- 

 tions remain still to be answered by more extended field study. 

 Some of these are indicated on the accompanying map. It is 

 not expected but that, here and there, minor modifications of 

 the results presented may arise, from this more careful and 

 detailed field study, but the main features of the preglacial 

 drainage seem to be so thoroughly established as to leave little 

 room for doubt in regard to the correctness of the general cor- 

 relations. The matter will be presented very largely in the 

 order in which it was worked out in the field studies. Some 

 references will be made to earlier work and observations, but it 

 is not intended that this shall be in any sense a completed mon- 

 ograph of the region. Most of the facts presented in the text find 

 their expression in the accompanying map (Plate I) and illus- 

 trations in a form which will give to those not familiar with 

 the region a clearer idea of the results. Much of the detailed 

 data is purposely omitted from this paper and only such are 

 given as bear directly on the general conclusions. 



The author desires to take this opportunity to express his 

 thanks to the generous donor of the Special Research Fund for 

 this practical interest in pure science, and in the Ohio State 

 Academy of Science, and to the trustees of the fund for their 

 confidence in his ability to wisely expend the portion allotted 

 to him. And furthermore, to express the hope that the results 

 herein presented will prove of sufficient value to warrant this 

 generosity and confidence. 



LOCATION OF THE AREA. 



The region under consideration embraces all of Washington 

 county and parts of all the counties which bound it in both Ohio 

 and West Virginia. It includes the territory drained by the sec- 

 tion of the Ohio from New Martinsville, W. Va., to the mouth 

 of Shade River, Ohio, except that portion of the Muskingum 

 above the north line of Morgan county, and of the Hocking 

 above Athens, in Athens county. The section lying north of the 



