1971-D Lincoln Major Lamination On Obverse

To me it looks like a struck debris issue. The debris is now peeling. The difference between a lamination and a struck through debris?

The debris is usually not in a straight line. It is something was fell on to the coin before it was struck. It is a striking issue.

A lamination is where the stock material was roll out and perhaps some of the metal is not sticking together. When the blank is cut and it is run into the setup process. Sometimes this loosens the lamination. After the coin is struck it will peel off. But because these are larger, they usually flow in a straight line. So a Lamination is a planchet issue, a struck through is a striking issue. If the debris is thick, then it will add weight to the coin. If the lamination is large, then the weight of the coin will be less.