And among the total reserves of seimentary deposits,of Sinian are 51%,of Cambrian are 44%,of Devonian are 4.9%,of other periods totaled only about 0.1%.

• 在沉积磷块岩的总储量中，震旦纪的约占51%25，寒武纪的约占44%25，泥盆纪的占4.；9%25，其余时代占0