Donald A. Windsor
The historical Tri-Town Marker for the borders of German, McDonough, and Smithville was still in place on Sunday 7 April 2013.
It is a sandstone rock at least a foot wide, a half-foot thick and 2 feet deep, perhaps deeper. It is hard to find, so I like to visit it every few years, just so I can remember where it is.
An article about this marker appears in my book, cited below.
Windsor, D. A. The most significant corner in Chenango County. In: Souvenirs of Yesteryear. Norwich, NY: self-published. 2008. 1:28-29.