Seemingly one of the earlier features in room H15. Unclear whether once a part of a now-gone ashlar phase running either through 7323 7326, and 7391, or, less likely, through the space now occupied by 7374 and 7395. Alternatively, part of an also now-gone ashlar phase running through 7366 and 7393. The latter seems most plausible. More excavation is probably needed.