Any Idea What Could Have Happened To This Coin?

It looks like PMD, but it was found in a new roll of quarters. Could have happened post strike, but still at the mint.

 

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Possible, defective planchet, or something hit that area and broke it off, before it went through upset mill or reeding phase. Just my observation.

 

Can you weigh it?

 

Fractured die or deteriorated die.

 

A die break would cause it to raise above the coin, not sink into the coin.

 

Is it possible that some metal fragment got between the die and the planchet, and fell out after the strike?

 

The whole affected area look to be raised above the coin, correct?
Or is there an area that is indented in an arch?

 

I believe it to be a RIM BURR

 

The whole area is indented.

 

The batteries on my scale went dead. Need to pick up some new ones.

 

It has field details with in the area.
I was thinking possible retained cud and that area only looks indented.

 

It's definitely indented. You can see it in the fourth picture.

 

Paddy might be right. Take a look at this.
http://coinauctionshelp.com/forum/viewtopic.php?t=12293

 

Well done! That's why it looks like a retained cud.