This is a new sherd type, based on the form of the rim. It is flat on top, but not quite rectangular because it widens off the body at the interior (which is why I describe it as two part. It would be in the same group as WSAC3.03.C.10. But only in the case of this sherd are the surfaces, as preserved, so highly polished, and on the exterior, burnished. This is a delicate sherd--a thin walled vessel.
From Interior to Exterior