生物礁生存和发育有着严格的生存环境，但由于构造剥蚀作用，造成塔里木盆地中晚奥陶世原始沉积环境破坏殆尽。
Organic reef formation and development rely on very unique environment, but original sedimentary environment in middle to late Ordovician in Tarim was destroyed completely due to structure eroded.
恢复原生沉积构造的原始产状要素，是古水流分析中的一项重要基础工作。
To restore the original occurrence condition of a primary sedimentary structure is a routine work for palaeocurrent analysis.
在地层构造区划分的基础上，系统论述了前南华纪岩石地层层序、宏观特征、沉积环境、原始构造环境。
The stratigraphic order, feature, sedimentary environment, original tectonic environment of Pre-Nanhua system are discussed on the basis of division of stratigraphic tectonic area.
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