It is at present 106 feet in depth. This is to be raised to 124 feet. It is founded on a formation of gneiss and hornblende schist. There are 37 sluices. The catchment area is 4,100 square miles. The ...
Lithologically, the Yifeng Formation is mainly sericite (quartz) phyllite (partly schist) containing inter-layers (or lens) of metatuffaceous rocks, silty sand, and metaplasia-horn porphyry ...
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