yST£M 
Some Pro -Glacial Lake Shorelines 
241 
same orientation, and are identical in some other details, such as a 
secondary spit on the inner side, and another on the north shore 
side; extending eastward from this latter detail of the Bellevue 
spit, I have mapped three slender ridges of fine sand subaqueous 
in origin; similar subaqueous ridges are forming eastward from 
the Cedar Point spit. The secondary development on the south 
side of the Bellevue spit appears to have grown shoreward till 
it united with an off-shore barrier in section 21 of York Tp.; 
an analogous formation appears to be under way at present in 
Sandusky Bay. The extensive areas of black muck soil in the 
southeastern part of section 21 and in adjacent parts of other 
sections of York Tp. indicate that for some time this off-shore 
barrier and the spit with which it had been united marked the 
shoreline itself. 
When compared with other sheets in Ohio, the Bellevue quad- 
rangle shows the Lower Maumee shoreline in a remarkably well 
