The reef-chert suite is an important rock assemblage, and consists mainly of four types of rocks with a fixed andorderiy relation in space and time. Its lower part is composed of carbonate rocks of reef facies (including reef,mound and organic bank); the upper part is represented by fine black detrital rocks; and the transitional partbetween the lower and upper parts is marked by hydrothermal sedimentary infilling, metasomatic and dynamicrocks (ores) characterized by cherts (nonbiogenic laminar, banded and massive cherts) and metal ore layers.