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So-called “biographic” rock art of the Northern Plains is probably the rock art where we can be most certain of parts of its meaning, because of the very close relation between the ledger art just referred to and rock art using the same symbols.

Both ledger books and the related rock art often recorded biographies of individuals, their accomplishments, victories in battle, and other events.

Rock art, whether shields, large human-like figures, or even mere handprints, may have been used mark territory, homes, food storage, or other things.

As soon as patina is removed, bacteria start to create patina again on the new surface.

Roughly, we can say that darker petroglyphs are older, because they have been exposed longer to formation of patina.

Rock Art can be “interpreted” in many ways, including by modern artists and spiritual practitioners with purposes which may have either a lot or very little to do with the reasons it was produced long ago.

These modern interpretations can be useful to those who engage in them, even giving great pleasure and serenity.

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