摘要: Unique rocks are found infilling some karst fissures, caves, depressions （valleys）, hill slope and niches in Guilin karst regions, such as breccia cemented by reddish calcareous and argillaceous materials; gray or grayishgreen calcareous mudstones; and grayish-black silty mudstones. The origins of the rocks were not clear because of the lack of systematical research. It is