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Montana, east, Corn Dog sandstone in McCone County. These odd looking stone formations in McCone County are what geologists refer to as concretions. Sediment that was hardened by mineral bearing solutions that acted like a cement between the grains. The tubular shaped piece, which is about 12 feet long, would have originally been upright before the softer material was eroded away. The corn dog look is due to a different mineral and sediment consistency that surrounded the core.