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锡铁山铅锌矿床含矿绿岩系的时代,五十年代曾划为前震旦纪,六十年代已先后有人划为早古生代和奥陶—志留纪等,但由于没有化石资料或缺乏地质年龄依据,在地层时代划分上认识不一,各持已见。笔者在参加1981年锡铁山铅锌矿床调研和1982年课题(微体古生物化石样品待处理)工作中,于Ⅰ矿带五坑六穿脉(北穿脉)两矿体间的灰色条带状大理岩(81SBl66)和Ⅰ矿带北部含硅泥质大理岩夹层中(81SB69)采集到了牙形刺化石样品,室内处理后,经我所二室李晋僧同志鉴定81SB166为牙形刺化石碎片;81SB69为Ambalodus
The era of the Xitiashan Pb-Zn ore-bearing greenstone series was designated as Pre-Sinian in the 1950s. Some people were successively classified as Early Paleozoic and Ordovician-Silurian in the 1960s. However, due to lack of fossil data or lack of Geological age, according to the division of stratigraphic age on the understanding of different, all have seen. In 1981, the author participated in the research of the Xieshan lead-zinc deposit and the 1982 project (samples of the microfossils of ancient fossils to be processed), the gray band (81SB166) and the northern Si-bearing silt marble intercalation (81SB69) in the northern part of Ⅰ orebodies. After indoor treatment, we identified 81SB166 as conodont fossil fragments through the laboratory of Comrade Li Jin- 81SB69 is Ambalodus