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自从国际地层委员会对温洛克统底界再研究以来,在中国紫阳地区找到了许多横过兰多维统至温洛克统的连续剖面,随着调查和研究的深入,必然提出许多新的问题提供给大家讨论。根据Lenz和Melchin的意见,温洛克统底界之下的关键笔石C.insectus的特征在于它的巨大尺寸,多次分支,主枝上在幼枝发生前部分的强烈缠绕。它与C.murchison的区别在更宽阔分散的幼枝,也以此与C.margusaricus(Golikov)不同。但这些区别它们在定量上是多少,笔者根据世界上7个地点的统计,这个幼枝间隔的幅度是10~68个胞管或毫米,第一与第二
Since the International Stratigraphy re-studied the bottom of the Rohivoden system, many continuous cross-sections ranging from the Landovian to the Winderlocks have been found in the Ziyang area of China. As investigations and studies deepen, many new questions are bound to be presented We discuss. According to Lenz and Melchin, C. petrctus, a key petroglyceride below the bottom of the Roe Deer crust, is characterized by its large size, multiple branches, and intense entanglement of the main branch before the shoots develop. It differs from C. marquisison in the more widely dispersed young shoots, also unlike C.margusaricus (Golikov). However, these are the quantitative differences between how much they are based on the statistics of the seven places in the world. The interval between young shoots is 10 to 68 cells or millimeters. The first and second