A late road surface laid down to regrade the slope of the side street, in order to connect the main trunk road with the part of the side street further north (at a shallower slope) paved in basalt stones, which this surface seems to rejoin and with which it seems to have been partially in phase.
Brown surface below 6071 and west of 6065.
view from north
photo taken from west
photo taken from north
photo taken from east
view from east