		GeoChuck	That's a good question I don't know.
		tomswift46	Maybe sedimentary layering and then if that was then within the earth,buried...a metamorphic change due to being surrounded by molten lava(magma)...
		tanddjohnson	I agree with Tom. sounds very good to me and the logical answer.
		MIKEDONAHUE	hello sir,
		candyruth	These days, maybe photoshop caused it, but I think not in this case.