Bulletin of the Scientific Laboratories of Denison University. 
Vol. XI. Article VIII. With Two Maps— Plates XXV-XXVI. March, 1899. 
MODIFICATION IN THE JONATHAN CREEK DRAIN- 
AGE BASIN. 1 
H. J. Davis, B. S., 
Graduate Student in Geology. 
My attention was first called, by a map study of the re- 
stored pre-glacial drainage of the state, to the possible existence 
of a preglacial drainage line extending from Zanesville, in Mus- 
kingum county, southwest along the line of Jonathan creek in 
the direction of the Licking reservoir. An extensive examina- 
tion was made of this region during the fall of 1 897, in company 
with Prof. W. G. Tight, of Denison University, the valley of 
Jonathan creek was carefully traced throughout the entire 
course. 
The areas drained by this stream and its tributaries, as 
shown by the map (Plate XXV), include Newton, Harrison and 
Hopewell townships of Muskingum county, Clayton, Madison, 
Hopewell and Thorn townships of Perry county and Bowling 
Green township of Licking county. 
The heavy broken lines represent the county limits, the 
small continuous lines those of the townships. Black wavy 
lines mark the course of the present drainage system of Jona- 
than creek and its tributaries. A portion of the north branch 
of Rush creek is shown near the bottom of the map. At the 
extreme upper right hand corner a section of the Muskingum 
river is represented, showing the entrance of the Licking river 
at Zanesville and that of the Moxahala river some miles below. 
Heavy broken lines outline the preglacial valley walls. A part 
of the Licking reservoir is shown to the left. 
Jonathan creek rises on a broad, level, drift, plain near the 
eastern extremity of the Licking reservoir. At Thornport, 
which is situated upon the drift deposit, gas borings show a, 
depth of drift of over 200 feet. 
1 Accepted as a thesis in Geology in Denison University, 
