Need help identifying button or ?

[searcherman]

The button or ? Has "U S G S" "KY" "B M". About the size of a nickel.Any help would be helpful.

 

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[CRUSADER]

maybe part of a popper stud

 

[taz42o]

U.S geological survey marker.

 

[IronSpike]

I agree with taz420 survey marker.

http://www.rickly.com/gsa/Images/TREE_TAG.JPG

 

[72cheyenne]

Maybe the rest means?

KY = Kentucky
BM = Boundary Marker

 

[IronSpike]

Maybe the rest means?

KY = Kentucky
BM = Boundary Marker

BM likely Boundary Marker or Bench Mark?

http://en.wikipedia.org/wiki/File:USGSSurveyMarker2000.jpg