A site in Littleton (2)

Continuing from the previous post. I headed downhill to the south, staying behind the houses and came to another low oval ground pile, and then several more piles, some supported and others on the ground. These were all around a puddle of standing water in an otherwise flat area.
These last two look effigy-like because of the larger "head" rock on the periphery. Here are a couple more at the edge of the water.
It was too bright to take good pictures. Anyway, I do not know what type of site this is, if not an effigy site facing southeast over a small vernal pool. But it is not clear.