The debris flows in the Lozenska Mountain from Subboreal and Subatlantic periods

This research was conducted in June 2020 in connection with carrying out rescue archaeological excavations of a site recorded during the construction of the Sofia Ring Road, in the northern foothills of the Lozenska Mountain. On the basis of sedimentological studies of cultural layers, the flow of two mudflows with a southeast-northwest direction were proven at different depths. The discovered archaeological artefacts, mainly fragmented ceramic vessels, help to date these two flows through the Subboreal and the lower Sub-Atlantic. The first, located deeper than the modern surface flow, is dated after the 2nd millennium BC. (i.e., from the Subboreal). The second is the shallower stream, after the Roman era, II–IV centuries AD. (i.e., Sub-Atlantic). Both flowed into the Iskar River. Nowadays. it is difficult to determine their exact location. The archaeological sites from the two streams brought artifacts located in a south/southwest direction, closer to the northern slope of the Lozenska Mountain.