Nine trenches were opened on six different fields (Fig. 33), four of which had already been started in the 2017 season. In Field 1, an extension of last year’s trench to the east revealed that what formerly had been interpreted as a somewhat askew late Geometric/early Archaic wall was in reality a strangely arranged amount of covering stones of a grave of this time. No traces of early architecture were revealed in this trench. In Field 3, the Classical building structures in Trench 3A were further examined by extending the trench to the north, east and south. The monumental wall already found in 2017 was excavated down to bedrock and probably dates to the first half of the 4th c. BC, although its function cannot be specified yet. In the second half of the 4th c. BC, this wall was included in a room of hitherto undefined function constructed of rubble walls to the west of it, which yielded large amounts of pottery (Fig. 34) and tiles as well as terracotta figurines. These finds together with the monumental wall point to a public or cultic use of this structure, which was covered by a massive fill in the early 3rd c. BC (i.e. after the destruction of the old town).
In Field 4, both trenches from 2017 were extended southwards. In the southern part of Trench 4A, a late Classic/early Hellenistic grave district was discovered, which on its northern side was bordered by a channel that was at some point filled with earth and covered by slabs to form a wall. North of this wall, a road characterised by different surfaces and repairs of Classical times ran in west-east direction, i.e. between the city and the harbour, and was bordered by a wall on its northern side. Trench 4B yielded a corner of a wall of large, partly reused blocks generously laid in mortar, which could have defined a grave precinct or could have had other funerary functions. A new trench was opened in Field 6 south of the church of Ag. Varvara because of anomalies in georadar measurements discovered in 2016 and revealed a Byzantine structure of some production purpose and Byzantine graves in connection to this structure. The establishment of earlier phases under this structure will be a task of future seasons. The pile of blocks used in the former church of Ag. Varvara was stripped to the ground, the blocks being ranged in the lapidarium and further investigated.
On field 7 in the northern area of Old Sikyon, 3 trenches were lied out on anomalies discovered in resistivity measurements. Trench 7A yielded Classical building structures (a room, a corridor (?), a drain and remains of floors; Fig. 35) connected to a large complex, including destruction layers from the late 4th c. BC, maybe corresponding to the time of destruction of the town. Through Trench 7B, a linear anomaly crossing the whole field was investigated, as it was suspected to represent part of the fortification wall, but this theory could not be confirmed. Trench 7C revealed the front of a late Classical or early Hellenistic grave monument of very fine execution. On field 9 in the area of the core of the old town, a trench was opened because of anomalies in the geomagnetic measurements and finds of private architecture in previous rescue excavations. The corner of a room with a mortar floor and a corridor to the south of it were excavated and seem to belong to a private house from the second half of the fourth c. BC.