安徽省淮南煤田上石盒子组的中上部,即第六含煤组18煤和19煤之间以及19煤上部,在各勘探区都发现1～2层厚度约10厘米的硅质层。最近在明龙山附近一个钻孔中,在18煤和19煤间采得硅质层厚10厘米,肉眼观察为黑色、灰黑色,裂隙较发育。经薄片鉴定,发现90％左右都是海绵骨针,骨 The middle and upper part of the upper Shihezi Formation in Huainan coalfield in Anhui Province, that is, the sixth coal-bearing group, between 18 and 19 coal and the upper part of 19 coal found 1 or 2 siliceous layers with a thickness of about 10 cm in each exploration area. Recently in a drill hole near Ming Long Shan, the thickness of the siliceous layer was 10 cm between the 18th coal and the 19th coal. The naked eye was observed as black, gray and black with more developed fractures. The identification of thin slices, found that about 90% of sponge spicules, bones