1980-D LMC what are these lines from?

On another site I am a member of there seems to be a difference of opinion as to what causes this.

Some including me think they are from rollers while others call these "woodies"



So roller lines or "Woody"?

 

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They are commonly refered to as "woodys", But what are they caused by?
If it was just the metal rollers all coins would have them. Go back one step and find that it is believed to be from an inproper mixing of the metal before being poured into ingots and then pressed into bars. As the thickness roller streches the metal the different parts of the mix are turned into lines in the metal. And are not usually visable until the coin has some tarnish on it, and they are not always in striaght lines.

 

This look can be found on several types of coins.

 

Impregnated impurities pressed into the metal during the planchet sheet rolling process. It's been discussed many times here on CT.

 

I'm sure there is a post somewhere for "post your woodys", But here is a different type of graining. From 1942.

 

I found 4 of these this week. 2 1980D LMC, 1 1980P LMC, and 1 1982D Copper LMC.

 

They're pretty common, so common I stopped saving them except for nice, 2-sided ones I find.

 

2 of the 4 I found this week were 2-sided. Here is the other one

Since I only search my pocket change, these are the 1st woody's I have found.