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除安徽休宁流塘—浙江临安马哨一线外,苏浙皖地区石炭系黄龙组纯灰岩段之下,普遍地有几米至几十米厚度不等的白云岩(不少地方白云岩的上部因去云化作用变为巨晶灰岩),它们形影相随。大致以江苏镇江——安徽宿松一线为界,可分南北两带,两带白云岩中的化石面貌各界。南带全部属中石炭世早、中期,而北带除江苏江宁大连山剖面白云岩顶部发现中石炭世早期牙形石组合外,其余均属早石炭世晚期。对这种层序相同,岩性相似,但时代不一的现象,目前有着各种不同的解释方案,归纳起来,主要有
In addition to Anhui Xiuning Liu Tong - Zhejiang Lin’an Mawei line, Jiangsu, Zhejiang and Anhui provinces under the section of pure limestone of the Huanglong Formation, there are generally a few meters to tens of meters thick dolomites (many places of dolomite The upper part is degenerated into giant crystalline limestone by de-cloud), and they form a shadow. Basically to Jiangsu Zhenjiang - Anhui Susong line for the community, can be divided into two zones, two dolomites in the fossil appearance of all walks of life. All the southern belts belong to the early and mid-Carboniferous in the early and middle stages, while the northern belt except the Early Carboniferous conodont assemblage at the top of the dolomite of the Dalian section of Jiangning in Jiangning City are all the early Early Carboniferous. There are various explanations for this kind of sequence with the same lithology and similar lithology but different times. To sum up, there are mainly