IOWA ACADEMY OF SCIENCES. 



THE TOLEDO LOBE OF lOWAN DRIFT. 



BY T. E. SAVAGE. 



The southern margin of the main Towan drift sheet 

 extends in a sinuous line across the central portion of 

 Tama county. From this border a tongue-shaped lobe, 

 having an average width of about six miles, extendi 

 southward for a distance of eight or nine miles reaching 

 one mile below the city of Toledo and within two miles of 

 the Iowa river. This extension I have called the Toledo 

 lobe of lowan drift. It is bordered on the west from the 

 point where it leaves the main lowan drift sheet, about 

 the middle of the south half of section 14 of Carlton 

 township, down to near the middle of section 21 of Toledo 

 township, by the hills which form the w^est bank of the 

 valley of Deer creek. From the latter point the irregular 

 ridges which mark the margin of the lobe trend to the 

 southeast for one-half mile, and then eastward, continuing 

 in an undulating line near the north side of sections 27, 

 26, and 25, of the township of Tama. They enter Otter 

 Creek township not far from the southwest corner of sec- 



