Profile A-A’ shows the basic character of Lake Magnolia, which appears to be comprised of a single depression. The characteristics of this lake are very similar to Kingsley Lake, Blue Pond and several other lakes in the region. The subbottom was disturbed during the subsidence then covered and infilled similar to Types 2 and 6 karst features described on the Karst Features pages. In the northwestern corner of the lake is a buried block that has rotated and slumped into the sink (Type 3).

The main depression is continuous across the lake in both of the predominant traverse directions. Profile A-A’ from Lake Magnolia shows a singular subsidence that is shallow nearshore with onlapping fill on the northwest flank. The central portion of the lake has an undisturbed surficial layer that is acoustically transparent and is possibly composed of high-organic sediments termed “gyttja”. The undisturbed nature of the surficial sediments implies that there has been little to no recent subsidence. In this case, as the sink became plugged, the lake developed a shallower and flatter bottom due to the infilling associated with runoff and eolian processes.