SF-4 was opened on the Piano del Tesoro, approximately 3m south of the Tripartite Building/OC3. The purpose of opening SF-4 was to better understand the stratigraphy located directly to the south of the Tripartite Building/OC3 and potentially reveal additional architectural elements associated with the building that may provide additional clues as to its function.
However, excavation in SF-4 did not reveal any additional information about the function of the Tripartite Building. Rather, the unexpected stratigraphy which was uncovered provided new insight into the nature of the functional surface of the area during the Archaic period. At approximately 27.53m AE, along the south wall of the trench, and especially in the southwest corner, a layer of dark soil with a very high number of carbon inclusions was uncovered. Roughly one meter north of this carbon-packed soil was a rock feature that ran east to west through the center of the trench. This rock feature consisted of medium to large sized rocks packed loosely together with a light brown soil. The feature seems to be datable to the Archaic destruction phase, as an archaic feline water spout (20080190) was found underneath this feature nearly on top of bedrock in the adjacent trench SF-3 (see EC VII). Therefore, it seems that the bedrock beneath the rock feature was exposed during the Archaic period of occupation at Poggio Civitate.
It was theorized that this unusual stratigraphy was part of a drainage system that was implemented during the Archaic period in order to channel heavy rainfall away from the Archaic complex and down the plateau. Further excavation is needed to determine the exact limits of this fossa and to more fully understand its function.
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