The older strata gradually disintegrate.
较老的岩层
化。
裂本领
剂；
裂剂The older strata gradually disintegrate.
较老的岩层化。
Results show that hydrogen-rich macerals are disintegrated while other macerals like fusain, and exinite are resistant to disintegration.
富氢煤的显微组被，
丝炭和角质等煤的显微组
。
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