Very striking large petrified wood slab with pronounced tree rings and unusual details in the overall matrix. I am not entirely certain, but believe this to be from either Oregon or Washington state. Face measures 7 x 6 1/2 inches. Is about 1 inch on average thick. Weighs 3 lbs! Is rough and uncut on reverse. Rests nicely angled on a flat surface. This specimen is truly a collectible piece. Brilliant polish.