Revisiting kettle holes

Given recent experiences, I thought it would be worth revisiting a couple of other kettle hole sites, while I am down in Falmouth. One, off Brick Kiln Rd, has a couple of piles, but I was unable to find any others even looking hard. When I went looking on the opposite slope for boulders (whose shadows would reach over to the piles):On closer inspection:What's that? Still closer:Wonder how long that's been there?