This is an example of scoria, which you see all over the hills in northeastern Wyoming. Scoria comes from coal-seam fires, the underground smouldering of a coal deposit. The fires in the coal seams are often started by lightning or grass or forest fires, and they can smoulder long after the flames have burnt out. They propagate along cracks in geologic structures. These types of fires have occurred for over three million years in eastern Wyoming and Montana and have shaped the surrounding landscapes.
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