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1965年7月常汝钦同志和笔者于浙江江山城北老虎坞附近工怍时,曾在奥陶纪的黑色燧石层夹硅质页岩中采到一些笔石,其中翼笔石 Pterograptus 一属的出现,说明了该处有宁国组顶部地层的存在。为了进一步证实其可靠性,同午9月笔者又去老虎坞尽可能地测制了一段地层剖面,系统采集了一些化石,经笔者鉴定(部分笔石曾请陈旭同志复核)进一步证实了该处翼笔石一属的存在。产翼笔石的岩层为灰白色硅质页岩夹少量粘土质页岩,层厚3.3米。与
In July 1965, Comrade Chang Ruqin and his author collected some petrulite in the Ordovician black chert with siliceous shale during the Gonggong near the tiger dock in the north of Jiangshan, Zhejiang. Among them, Appeared, indicating the presence of the top strata in Ningguo Formation there. In order to further confirm its reliability, in the same month in September I went to Tiger Dock as far as possible to measure a section of stratigraphy, the system collected a number of fossils, the author identification (some of the pen have requested review of Comrade Chen Xu) further confirmed that the At the wing of a pen is a rock existence. Wing wing penolith rock formation for the gray siliceous shale with a small amount of clay shale, layer thickness of 3.3 meters. versus