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Stonehenge Phase III, sub-phase 3vi (c. 2550-1600 BCE)The Y and Z Holes.In the final sub-phase (3vi), two circles, one inside the other, known as the Y and Z Holes were dug for the placement of stones but were never filled.Probably also dating to Phase III are the four Station Stones (only two of which survive, and one of them has fallen).These have caused the area enclosed by the ditch to appear mound-like and have lead to the erroneous identification of each mound as a burial barrow.