The sandstone-hosted copper deposits of Cretaceous age in the Chuxiong basin were closely related with the lower coaly formation, the middle cupriferous formation and upper gypsum-salt formation.

楚雄盆地砂岩铜矿产于白垩系地层层位中， 矿床与盆地内的下部含煤建造、中部的红色含铜碎屑岩建造和上部白色膏盐建造关系密切。

The certain oil and gas pertained to coals and coaly mudstones have been found in the Jurassic coal-bearing basins in NW China.

近年来在中国西北地区一些中生界含煤盆地，如准噶尔东部盆地、吐哈盆地陆续发现了与煤及煤系泥岩有关的具有工业价值的油气田。

Mianxian Group is coaly continental deposit of Lower and Middle Jurassic from Mianxian to Ziyangxian of South Shaanxi Puovince.

勉县群为陕南勉县至紫阳一带早中侏罗世陆相含煤沉积；

The coaly muddy water is difficult to use, the main reason is the small grainy coaly mucl is amassed in the coaly muddy water for a long time.

细粒煤泥在煤泥水中的长期积聚是影响煤泥水处理效果的主要原因。