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    Interlocking microcrystalline calcite crystals and microspar with veinlets of hematite. (Angular fragments of turbid, fine-grained, distinctly layered limestone are cemented and veined by clear, much coarser grained calcite. The limestone pieces contain uniformly fine-grained calcite, veinlets and patches of hematite, small aggregates of chalcedony, grains of sand and silt-sized quartz and disseminated shreds of opaque carbonaceous debris. Some pieces are so fine-grained that they approach the texture of lithographic limestone.)