Rather than a buttress (as it initially appeared to be, per the definition), these tufo blocks seem to represent an E-W wall that subdivided the space between the N-S ashlar walls at the eastern side of the open central 'piazza' (cf. wall 7097 to the north). The lowest course of blocks appears to have been reworked in a later period to serve as a threshold (abutted by part of a floor surface visible in the section to the south, not excavated in 2017). Whether in the original phase there was an opening in the wall here, or whether the second and third (and fourth, etc.) courses of blocks have been mostly obliterated to create a new later opening, is unclear at the moment.
E-W ashlar wall forming E part of S limit of Room 1 and Opus mixtum wall built on top of wall 7057 and Tufo slab floor at N end of Room 3 and Ashlar wall running N-S at E limit of Room 3 and Tufo block and mortar on slabs 7130 and Upright ceramic tube south of wall 7131 and Opus reticulatum wall S of floor 7130 and Fill of circular cut S of wall 7131 and Petit appareil wall running N-S at W limit of Room 3 and Ashlar block aligned E-W in Room 3, covered by wall 7079 and Buttress of tufo blocks built against W side of ashlar wall 7078 and Concrete threshold between walls 7079 and 7080 and Petit appareil wall running N-S south of wall 7079 and Buttress of tufo blocks S of buttress 7097
View from north