A north-south wall built dominantly of andesite and limestone across the western quarter of operation AB4. At its northernmost extent, the wall emerges from the northern operation wall in a generally southern direction. Approximately 1.5 meters from the southern operation baulk it turns to the east and meets the locus 4 wall heading approximately southeast. This built locus includes a wide variety of course differences and heights, but there are generally four courses of stones.
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