The Ohio ^J\(^aturalist, 



PUBLISHED BY 



The Biological Club of the Ohio State Uni<versity, 

 Volume IX. DECEMBER, 1908. No. 2. 



TABLE OF CONTENTS. 



IlrBBAKD— Rock Turraccs aloug the Streams near Cohiinbus, Ohio 397 



MoRGULis— The Ertect of Alkaloids on Regeueration in the Scarlet Runner Bean -101 



ScHAFFNER— Plants ou the Ohio State List not represented in the State Herbarium . 4K! 



jNIcCrav— Meeting of the Biological Club 416 



ROCK TERRACES ALONG THE STREAMS NEAR 

 COLUMBUS, OHIO.i 



George D. Hubbard. 



Several striking terraces of solid rock occur along the Scioto 

 and Olentangy valleys in the vicinity of Columbus. Their 

 character has been revealed in the physiographic study of the 

 four local quadrangles, a study recently undertaken by the 

 Geological Survey of Ohio. They are related to the problem of 

 the post-glacial, and in some cases of the earlier development of 

 these valleys; and it has seemed best to abstract from the 

 material collected in the general study all the data Ijearing on 

 the rock terrace problem. 



So far as the quadrangles- involved are concerned, the ter- 

 races may be found, ten or more in number, at intervals along the 

 Scioto from the property of the Insane Asylum west of Columbus 

 to the northern boundary line of the area; and four or more, 

 along the Olentangy from near Powell to the same line. There 

 are also the beginnings of several rock terraces along the Big 

 Darby valley. 



The Scioto is on bed rock essentially all the way from the 

 northern boundary to the old quarries north of the Asylum; and 

 the Olentangy is similarly restricted from the same boundary on 

 the north almost to Worthington, with occasional rock encoun- 

 ters from there to well within the city limits. The Big Darby has 

 encountered rock at numerous well distributed points from just 

 below where it enters our area to a point midway between 



1. By permission of the Slate Geologist. Read before the Ohio 

 Academy of Science, Granville, O., Nov. 28, 1908. 



2. Dublin, Westerville, East Colitmbus, and West Columbits. 



397 



