chert clause[经] 燧石条款
diatomaceous chert硅藻燧石
oolicastic chert空鲕状燧石
bone chert[岩] 骨状燧石;骨燧石
chert bit钻硅质石灰岩用的钻头
nodular chert瘤状燧石;燧石结核
Structure Chert结构图
ocastic chert鲕状燧石
The strata were metamorphised at a low grade and some radiolarian chert beds areintercateted in the upper and middle parts.
2.该套地层为一套浅变质岩系,中上部夹放射虫硅质岩。
参考来源 - 川中东北部须家河组与珍珠冲段地层划分N（名词） a microcrystalline form of silica usually occurring as bands or layers of pebbles in sedimentary rock. Formula: SiO2. Varieties include flint, lyddite (Lydian stone) 燧石 (Also called hornstone)