Pairs of oblique hatches on the top of the rim.
In May 2014, I (Lori) added the b designation at the end of this object ID because the Gorges folks noted that the entry was a duplicate. I do not know whether this is a type, or whether I indeed labeled two sherds with the same number. But the picture associated with the object ID seems to resemble the other sherd, not this one.
From Interior to Exterior