Near the outcrop in the previous (9/30/2011) post runs a wall composed of standing slabs quarried from the same outcrop. Walls made of stacked stones may have been added to it later. The standing slab part is shown in solid blue lines, and the stacked part with dashed lines, in the map below. The entire wall complex has two legs, giving it a backwards "F" shape. In this part of northern RI, there are two other wall complexes with an F shape.
Standing stone slabs face to face is the most inefficient use of material. Why would anyone build such an impractical and costly wall, unless it had some spiritual significance? What strikes me about this stone row is the sense of energy in the tilted slabs, like dominoes falling.