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宜兴芳桥太阳山的地层长期以来为地质工作者所关注,江苏区调队(1962)(?)万常州幅地质调查时,由于未发现化石,仅根据其岩性认为是三叠系青龙群;而后,南京地质矿产研究所曾发现有三叶虫化石碎片,因而认为该地层可能为奥陶系:俞剑华(1979)在(?)处作了较为详细的工作.采到了牙形刺化石,认为其时代应归为早奥陶世红花园期为宜。由于岩性与红花园组不同而取名为芳桥组。笔者等于1985年在该地重新测制剖面,采到了完整的三叶虫化石,对该组地层的时代又有了一个新认识现将剖面介绍如下(图1)
The strata of the Taiyangshan Mountain in Yixing have long been of concern to geologists. When the Geological Survey of Changzhou Regiment (1962) (?) Changzhou District of Jiangsu Province was discovered, no fossils were found and only the Triassic Qinglong Group ; Then, Nanjing Institute of Geology and Mineral Resources has found trilobite fossil fragments, and therefore that the strata may be Ordovician: Yu Jianhua (1979) at (?) Department made a more detailed work.Have taken a conodont fossil, That its era should be classified as Early Redstone Garden period is appropriate. Due to lithology and red garden group different named Fangqiao group. In 1985, the author re-measured the profile in this area and collected the complete trilobite fossils, which gave us a new understanding of the age of the formation. The profiles are as follows (Figure 1)