After further study and identification of this area as a quarry, it appears that this is one of a series of cuts into the bedrock associated with quarry machinery. This one, specifically, may have accommodated one of the posts to which cranes’ tie-rods were tied

Thought at first to be the cut of a cremation burial (see SU5). Few artifacts in fill (SU5); unknown function. The cut is rather shallow, suggesting that it may have extended higher into the plowzone and is perhaps a filled agricultural pit of some sort.