middle triassic series

基本解释

Source beds are turbidite of middle Triassic series.
矿源层为中三叠统浊积岩。
There are two series of volcanic rocks, the middle Triassic Pantian'ge formation and the late Triassic Chuiyibi formation, in the northwestern Yunnan collisional orogenic zone.
滇西北地区碰撞造山带中出露两个火山岩系，即中三叠世攀天阁组和晚三叠世崔依比组。
The stratiform and strata-bound iron ore deposits in the Middle Triassic series in the lower reaches of the Yangzi River were formerly considered as simple contact-metasomatic ore deposits.
长江中下游中三迭统层状—层控型铁矿床，曾被传统地视为典型的接触交代型矿床。