THE 



Ohio Journal of Science 



I'LIU.ISHKD BY THE 



Ohio State University Scientific Society 



Volume XVII MARCH, 1917 No. 5 



TABLE OF CONTENTS 



Hubbard — Geograph}- in the Columbus, Ohio, Quadrangle 137 



Mote — Observations on the Distribution of Warble Flies in Ohio 169 



GEOGRAPHY IN THE COLUMBUS, OHIO, 

 QUADRANGLE.* 



George D. Hubbard. 



introduction. 



The Columbus quadrangle (Fig. 1) includes an area which 

 has had a long complex ph^^siographic history, and yet today it 

 presents very simple topography. 



Paleozoic strataf, essentially limestones in the west, shales 

 through the central part and sandstones in the east, underlie 

 the whole area and are almost horizontally disposed. Subjected 

 to stream erosion from the date of its uplift to the beginning of 

 the glacial period, the region was apparently almost completely 

 base leveled; and then the streams were rejuvenated, at least 

 before Illinoian time, and young valleys were carved below the 

 peneplain. During the glacial period at least two distinct ice 

 invasions occurred and each modified the topography both by 

 erosion and deposition. In interglacial stages, streams devel- 

 oped youthful valleys which were subsequently drift-filled. As 

 the last or Wisconsin ice melted off, the present stream cycle was 

 begun. In post-glacial time, the streams have carved several 

 long narrow valleys with multitudes of short minor tributaries. { 



*Published with permission of the Ohio State Geologist. A part of the cost 

 of illustrating this article was covered by a grant from the Emerson McMillin 

 Research Fund, Ohio Academy of Science. 



fOhio Geological Survey, Vol. 3. p. 599f. U. S. Geol. Surv. Folio 197. 



JA full description and discussion of the stratigraphic and physiographic 

 history of this region may be found in Bulletin 14, 4th series, Geological Survey of 

 Ohio, by the author in co-laboration with Drs. J. A. Bownocker and C. R. Stauffer. 



137 



