An archaeological excavation consisting of four trial trenches reveealed part of a mosaic pavement adjacent to an unusual Roman sunken feature, the walls of which were lined with opus signum. The walls of the feature had been robbed out, leaving the opus signum free standing. The feature contained a large amount of painted wall-plaster, as a 4th century coin. The sunken room and mosaic pavement were part of a 2nd or 3rd century house within the Roman suburb on present day North Station Road. <1>