Small sites on Shepley Hill Groton

I owe an explanation for sites D, E, and F on Shepley Hill. At D there were a few piles on the ridge and on the western side.

 view back to previous

At E there were a few suggestive things next to the wetland. This short stretch of wall particularly caught my eye: 

Finally at F, more low worn-out piles on a western facing slope. Probably just marker piles, but perhaps also a small "box" or two: