EXPLORATION OF BASILICA IN DUROSTORUM (Georgi Atanasov – geoatal@abv.bg, Dragomira Boeva) Excavations of the Early Christian basilica discovered in 2004 continued. The narthex with a floor of square and hexagonal bricks arranged in panels was thoroughly explored. The atrium with a floor of stone slabs is situated to the west of narthex. The entrance between the atrium and the narthex is 1.30 m in width and is parallel to the entrance between the narthex and the central nave of the basilica. A dwelling dated to the end of the 9th – 10th centuries containing sherds was discovered at 30 cm above the floor of the atrium. The pottery of the cultural layer related to the atrium and the narthex includes sherds of the 4th – 6th centuries AD. Fragmentary marble details and tiling were found too, in addition to two fragments of an openwork marble screen that most likely was placed on the stylobate of the columns between the naves of the basilica. The western wall of the atrium lies on a reused wall, 90 cm in width, belonging to an earlier building. The church is a three-nave and single-apse basilica with a narthex and an atrium, 32.80 in total length. The narthex is 2 m in width and the atrium is 5.90 – 6.20 m in length. A heating system was discovered to the west of the atrium and a wall 60 cm in width and built of uneven stones bonded with mortar, belonging to an earlier basilica, was explored. A terracotta water-conduit was discovered to the west of the wall. The exploration of the wall located to the north of the basilica continued. It is oriented north – south and is 15.10 m in length. The foundation of the wall cuts a layer containing traces of fire, pottery and coins dated to the 3rd – 4th centuries AD. Most likely, the wall belonged to a big public building of the 4th – 6th centuries AD.