A NOTE OF PROGRESS ON THE STUDY OF THE 
lOWAN-WISCONSIN BORDERS 
E. J. CABLE 
During the past year the writer has found some time to con- 
tinue his investigations of the Iowan and Wisconsin borders. 
As stated in a former articled there is a strong field evidence 
that the Iowan margin in Hardin and Grundy counties will need 
to be revised, especially in the vicinity of Eldora, Hardin county. 
Owing to the thinness of the Iowan drift, the high state of its 
weathering, and its complex relations to the loess, much more de- 
tailed work will be necessary before a definite boundary can be 
determined upon. 
There are suggestions that a terminal moraine of Wisconsin 
age in Cerro Gordo county continues into Worth county, to the 
east of the Colby moraine, as outlined by Calvin in Cerro Gordo 
county. 
Mr. I. A. Williams in his report of the geology of Worth 
county,^ divides the Wisconsin drift into two distinct areas. This 
division was made upon the field evidence of (1) the freshness of 
contours, and (2) drainage. The eastern terminal moraine belt is 
located in the northwestern part of North wood township, the 
extreme eastern part of Hartland township and the southern 
part of Brookfield township, see map, figure 35. 
About six miles to the west of this outer moraine is a second 
irregular belt of drift which Mr. Williams calls the inner terminal 
moraine. This moraine exhibits its most marked characteristics 
in Bristol and Fertile townships. In the last named township this 
inner moraine coincides with the outer moraine. 
This same prominent ridge, while making a sharp turn in sections 
35 and 36 of Fertile township, continues to the south and west in 
Cerro Gordo county. 
Some work was done on the moraine in Cerro Gordo county 
in an attempt to determine, if possible, whether two distinct 
moraines were present in the county. More work will be neces- 
sary before definite conclusions can be reached. 
iJowa Acad. Science, vol. 26, 1919, pp. 399-404. 
2 Iowa Geol. Survey, vol. 10, 1900, pp. 320-321. 
