Frost on the Pumpkins is a'comin...
      Indian Summer giving way to a definite freeze this week.

While we anticipate Trick or Treaters coming around on Halloween.. historians and others feel that some unfortunate mischief was visited upon Tri-State Rock, the marker which reflects where the states of NY, PA and NJ unite.

Enroute home from viewing the Tri-State Classic, I took family and a visitor to see the Boundary monument and the Tri-State Rock  - only to witness:

  
I have been told by NJ staff that according to National Geodetic Survey records, the disk was installed in 1942.  State personnel inspect this monument and were last there on August 15th. They found the disk was intact then.  
The disk (or medallion) is for surveying purposes.  It has a center point which allows a surveyor to set up instrumentation over it and survey to or from it.