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关于层状硅质岩的成因,目前认为均系化学或生物化学作用所形成。然而在江西经常可见到一种仅出现于地表靠近煤系地层附近的硅质岩,如长兴组的底部,茅口组的上部。龙潭组中的石灰岩在地表亦为硅
The origin of stratiform chert is currently thought to be formed by chemical or biochemical interactions. However, a type of chert that occurs only in the vicinity of the coal measure strata is often found in Jiangxi, such as the bottom of the Changxing Formation and the upper part of the Maokou Formation. The limestone in the Longtan Formation is also silicon on the surface