If not for pumping, the quarry north of the road would look like this one south of the road. This quarry was used for disposing of cedar bark from a fence-post industry, and tannic acid from the bark soon colored local wells like weak tea, harmless but annoying. Still, it's a potent illustration of why quarries can't be simply filled in with refuse. In quiet places on the water, patches of bubbles can be seen caused by methane gas rising to the surface from the decaying cedar bark. Iron staining on the side of this dolostone block is due to the oxidation of iron sulfides.
Geologic changes can occur even in a human lifetime.