Related to Ordovian: Permian


a. & n.1.(Geol.) Ordovician.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Most of the oxygen isotopes of micrite and grainstone are obviously more negative than those of the Late Ordovian marine carbonate (from -6 to -4[per thousand] VPDB) [43], which indicates that the matrix limestone in the Lianglitag Formation is strongly affected by the late diagenetic fluid.
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