THE SHORELINES OF GLACIAL LAKES LUNDY, WAYNE, 
AND ARKONA, OF THE OBERLIN 
QUADRANGLE, OHIO^ 
Frank Carney 
Six years ago in this Bulletin, vol. 16, pp. 101-117, the writer 
published a map of, and described, the glacial lake shorelines of the 
Oberlin quadrangle. Some of the beaches mapped were of doubtful 
interpretation, being too high or too low to conform to the shorelines 
then well-understood. The presence of other fragmentary beaches 
was not suspected, and accordingly not investigated. 
During the past year, parts of this area have been re-visited, and 
other parts studied, in the light of progress made elsewhere in map- 
ping the shorelines of former glacial lakes. So many corrections and 
alterations have been made that it is advisable to publish a new map. 
In a later issue of this Bulletin, a brief resume of proglacial lake 
history was published (vol. 17, 1913, pp. 234-236); certain altera- 
tions are required in this resume, chiefly thru the work of Leverett 
and Taylor (Monograph 53, U. S. Geol. Survey, 1915) who have 
ascertained more precisely the positions and altitudes of the outlets 
of the ice-front lakes, and the oscillations of the glacier margin asso- 
ciated with the several lake stages. The alterations required are 
principally in giving a wider range of altitude to the various lake 
stages; these are shown in Fig. 1 in which the submerged shorelines 
are indicated by broken lines. 
Each retreat of the glacier was apt to uncover a lower outlet for 
the water ponded in front of the ice, resulting in a drop of the lake 
level, as when the glacier in the Huron basin withdrew far enough to 
uncover an outlet across the 'Thumb'' of Michigan (the land between 
Saginaw Bay and Lake Huron), the first Lake Maumee, which over- 
flowed by way of Fort Wayne, Ind., ceased to exist, and the lowest 
Maumee stage was formed. Later the ice readvanced, covering the 
outlet of the lowest Maumee and causing the water to rise over the 
shoreline which that lake stage had developed, thus inaugurating the 
lake which produced the “middle" Maumee shoreline. During the 
existence of this stage, the beach previously ^ made stood beneath 
^Published with the permission of the Geological Survey of Ohio. 
356 
