常見例句It occurs in the upperpart of Lower Permian strata.It is composed of crystalline limestone with white-lighter gray-gray marble. 礦床主礦體賦存于下二疊統(tǒng)上部地層，主要巖性為結(jié)晶灰?guī)r夾白色-淺灰-灰色大理巖。 返回 upperpart