New foundations, New what-isits

[prolab69]

Searched a few different sites today, one in a pasture and 2 in the woods. now this green disc with the U.S. stamped on it was embedded in concrete, I dug a concrete chunk the size of a bowling ball. Ok ok I admit, I was the one who put the scratches in it digging it up . I also had to pound it with another rock to free it from the chunk. Anyone out there know what the heck this thing is? seems to be solid brass...i think. Also found this door knob and button. The button only has markings on the back, some kind of wreath design, ill do some searching about it, but some input from you guys is always nice.
enjoy the pics,
Pro-

 

[Ia.FurTrade]

Looks to be a US Geological Survey marker.

 

[tymcmurray]

Yeah. Those things are put in concrete to make them "permenant". LOL

 

[prolab69]

Hmm, ...it was in the middle of a pasture. any idea on the date of it? or are they still used today?

 

[wildrider]

I got beat to the answer again.

Survey pin is probably correct. I think some markers have more information on them like National Geological or Geographical survey and lats, longs, minutes and maybe elevation. I forget whats all on them as I've never brought one home with me, concrete is heavy.

I can't believe you destroyed a survey marker....

 

[Ron B]

Lol!
That's funny!
Does you detector still work after banging on that thing?
Great find just the same!

GRB

 

[prolab69]

Aww heck, i didnt know. the thing was like 5 inches deep in the middle of a pasture. Tell ya what, ill flip a coin. heads I put it back, tails it goes to the scrap yard. lol

 

[crazyjarhead]

That button looks to be an old one. Any lettering on the back?