This pertains to Kansas, but may be relevant in discussing interior marks on such pottery....
ARTIFACTS OF KANSAS WEB PAGE
The first illustration here is covered by this paragraph:
"Pulling up the walls of a conical pot leaves walls that are irregular in thickness. Middle Woodland potters fixed this problem by rolling a cord-wrapped rod across the exterior of the vessel, either directly upward (c19) or at a diagonal (c20) , leaving telltale cord marking. The same was not possible on the vessel interior, where the curvature of the vessel prevented the stick from lying against the vessel wall. Therefore, the interiors had to be smoothed using a horizontal motion. If the cord-wrapped stick was used to do this, it left horizontal cord-marking that is occasionally mistaken for a fabric impression (c32), as in Greenwood phase pottery. Another technique involved some sort of toothed tool that left horizontal grooves (c32a). If a smooth interior was desired, the marks left by the smoothing out of the walls could be erased with a wet piece of suede."
This paragraph describes first the third image here, and then the second photo:
"The interiors of pots made by the paddle and anvil technique were sometimes smoothed, wiped or thinned. Sometimes wipe marks can be seen on the upper portions of the interiors, apparently left by a handful of grass (aop5). Scraping to thin the walls sometimes dragged temper particles, leaving distinctive tracks (aop6)."
And finally, this observation: "Vessel interiors were usually smoothed, probably so that food would not stick to them. Nevertheless, some sherds exhibit interior surfaces that do have some texturing, either grooving or so-called fabric impressions. Both kinds of interior texturing are limited to a minority of vessels of Early Ceramic age."