Turret 29A (Black Carts) is located about 100 metres (110 yd) east of the minor road to Simonburn, and exists within a 460 metres (500 yd) long stretch of extant curtain wall of Narrowgauge at this point, with clearly visible foundation stones. (The term 'carts' within the name is derived from the old English word ceart, which means rocky and rough.[8]) Although severely robbed on the south side, the masonry stands up to eleven courses high in the recess.[9] The presence of the broad wing walls indicates that the fortification was constructed prior to Hadrian's Wall itself.[8] The upright portions of the door frame are made from solitary stones.[10][11] At the highest point of the structure, there are fourteen cut stones per horizontal row.[10]
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