This is a William Sears type, based upon his excavations at Kolomoki, and is probably some variety of Swift Creek Complicated Stamped. This type was set up to classify vessels in mortuary deposits. Sears himself felt that the type should be dropped since the type deals with vessel shapes that run through several levels, while the decorative aspect varies with time. Presumably named after the Mound Field site in Wakulla, County, Florida.
Complicated stamping on the upper half only of Swift Creek vessels. Rims usually have with narrow folds.