High Quality Content by WIKIPEDIA articles! The Y and Z Holes are two rings of concentric (though irregular) circuits of near identical pits cut around the outside of the Sarsen Circle at Stonehenge. The current view is that both circuits are contemporary. Radiocarbon dating of antlers deliberately placed in Y Hole 30 provided a date of around 1600 BC, a slightly earlier date was determined for material retrieved from Z 29. These dates make the Y and Z holes the last known structural activity at Stonehenge. The holes were discovered in 1923 by William Hawley, who, on removing the topsoil over a wide area noted them as clearly visible patches of ‘humus’ against the chalk substrate. Hawley named them the Y and Z because he had earlier, for a short time, labeled the then recently discovered Aubrey Holes the ‘X’ holes. 18 of the Y Holes have been excavated and 16 of the Z Holes. Further evidence of the Y and Z Holes being late in the sequence of events at Stonehenge is demonstrated by the...

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