Powisset mound without snow

I went back here to look for other sites. Found none and was brought by my feet back to the mounds of last weekend. Here was the nicest one:

I wanted to check for rectangularity and corners, and I wanted to confirm the presence of a collapsed center:

This was the "re-appetizer" of the other day. The outline was somewhere between oval and triangular.

I thought I saw one other bit of mound, in a swamp south of Strawberry Hill:

Pretty minimal. Otherwise the woods seem a bit empty down there in Dover.