Clay and clay-sand in soils or stream deposits were obtained simply by digging pits, then mixing mortar in the pits and carrying the mix to the construction site in baskets.
Clay and clay-sand in soils or stream deposits were procured simply by digging pits. Excavation with digging sticks would have been eased by the use of water, mixing mortar in the pits and carrying the mix to the construction site in baskets.