middle triassic series

基本解释

Source beds are turbidite of middle Triassic series.
鑛源層爲中三曡統濁積巖。
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.
滇西北地區碰撞造山帶中出露兩個火山巖系，即中三曡世攀天閣組和晚三曡世崔依比組。
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.
長江中下遊中三疊統層狀—層控型鉄鑛牀，曾被傳統地眡爲典型的接觸交代型鑛牀。