Another article in Logan's Journal on the "Geology of the Straits of Singapore" (1852:194) mentions that "At the food of Government Hill,near the Convict Lines(now the site of Sinhapore Management University Bras Brasah Park), there were found: White clays at 20 feet, red clays and laterite resting on a hard white clay at 30 feed". This clay is suitable for making modern art pottery (Kemp 1997:74). Thus the potters of fourteenth-century Singapore could have obtained raw meterial just outside the earthen wall, which provided protection for The northern flank of the settlement.