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Montana, east, coloful layers of stone and minerals in the Strawberry Hills area. This multi-colored cliff in the Strawberry Hills of east Montana reveals an interesting geological history for this region. As the ice ages receded (once about a million years ago and again ten thousand years ago) burning coal baked and hardened the soil and minerals above, basically making bricks. The temperatures of the furnace underneath varied according to depth, consistency and other factors. Each color is evidence of what temperature a particular layer was subjected to, which at times reached several thousand degrees.