Fig. 19

C.N. Microscopic photograph shows The marl sample from Member I is very fine-grained to fine-grained. Considerable amounts of cavities and microvienlets filling by recrystallized dolomite are observed in the micritic calcite matrix. The rock is very to fine-grained and composed mainly of calcite and dolomite as the essential components associated with minor amount of clay minerals and rare amounts of microcrystalline quartz, iron oxides and opaques. Calcite represents the matrix of the rock and occurs as very fine-grained (micrite), anhedral to subhedral interlocked crystals. Dolomite occurs as very fine to fine-grained, euhedral to subhedral crystals and filling microvienlets and cavities. Quartz is detected as very fine-grained crystals scattered in the matrix. Some pores of irregular shapes and various sizes are observed scattered in the rock. Some parts of the sample are stained by iron oxides