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It's a sedimentary concretion, possibly now metamorphosed. It looks like sandstone, but I can't tell for sure just from a picture. The rings are the result of accumulation over time of different kinds of sediments with different hardnessses which have eroded unevenly. The large cavity in the bottom is probably the result of a hard pebble having fallen out after being loosened by erosion.
Roger
I keep six honest serving-men (they taught me all I knew); Their names are What and Why and When and How and Where and Who.
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Some of the locals in my area call these Tornado stones. As mentioned above they are 100% geological pieces and to make you feel better, pre-columbian natives were rock hunters as well and I would imagine that they thought this rock was "cool" as well.
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