The evolution feature in the lower of sedimentary Sequences is from the tidal flat facies to shallow shelf facies, then back to beach system.
长龙山组的下部序列由湖坪相到浅水陆棚相再返回到海滩相;
in middle-late ordovician, there mainly were carbonate-classic mixed rock shelf facies in the west part and deep-water slope facies in the east part.
中&晚奥陶世,塔中地区西部以混积陆架相为主,东部以深水斜坡相为主。
Restricted platform, open platform, neritic continental shelf, abyssal fan and biohermal facies are mainly facies of Ordovician.
奥陶系则主要发育局限台地、开阔台地、浅海陆棚、海底扇及生物礁相等。
Furthermore, recognized shelf margin reef, grain bank, shelf margin bioherm and interbank sea these four facies and 12 subfacies.
并发育棚缘生物礁、粒屑滩、棚缘生物丘、滩间海4种相,12种微相亚相。
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