Middle Neolithic remains have been found in Lung Kwu Chau, Lung Kwu Tan and Yung Long in Tuen Mun, which suggest that humans were active along the coast during that period. Artefacts such as painted pottery ring-foot basins, painted pottery pots and fine corded coarse pottery cauldrons have been unearthed at these sites in addition to stone tools such as stone beaters, adzes and discs, all dating as far back as 4,000 BC. Bearing features common to other finds in Shenzhen, Zhongshan, Dongguan, Gaoyao, Zhengcheng, Zhuhai and Macao, these artefacts show that people living within the Pearl River Delta shared certain cultural similarities during the Neolithic period.
Many significant Late Neolithic artefacts and relics have also been unearthed in Yung Long, Tsang Tsui, Lung Kwu Tan, Lung Kwu Sheung Tan, Lung Kwu Chau, Sha Chau, So Kwun Wat etc. Several rows of postholes found in Lung Kwu Tan suggest the presence of Neolithic pile dwellings, while hearths, postholes, workshops for manufacturing stone tools and burial sites have been unearthed in Yung Long, all of which provide important insights for research into Hong Kong's prehistoric past. Fine slotted stone rings and stone yue axes (ceremonial axes regarded as symbols of power) give hints of possible trade and exchange of exquisite lithic products between prehistoric sites in the Pearl River Delta and elsewhere.
