Dune riocks are aeolian sands cemented ty calcium carbonate under subaerial conditions. They have been found in many of the coastal belts of Fujian, Guangdong and Hainan Provinces in South China. The
The Nandujiang delta dates from at least 3000 yr ago and probably was fomred earlier during the Holocene. The present delta is built up of plain, channels, lagoos, spits, coastal barriers and beaches.