Continuous existence of accommodation space led to well-developed lacustrine transgressive system tracts (LTST).

可容空间持续存在，导致湖侵体系域十分发育。

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Lowstand System Tracts of Early and Metaphse Jurassic Period was undergrown, of which Transgressive Systems Tract and Highstand Systems Tract made up.

早、中侏罗世低位体系域不发育，由海进体系域与高位体系域两部分组成。

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Each sequence is composed of incised valley sandstone of low system tract, limestone, marl, coal and mudstone of transgressive system tract and clastics and coal of high system tract.

各层序分别由低位体系域的下切谷充填沉积的砂岩、砂砾岩，海侵体系的灰岩、泥灰岩、泥岩、煤和高位体系域的碎屑岩和煤组成。

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