半索动物门 之 笔石纲（Graptolite）概述 Introduction 笔石是已经绝灭的群体海生动物，由于 压扁的笔石化石象描绘在岩石层面上的 象形文字，故得此名。
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...笔石;;沉积间断;;奥陶系;;志留系;;恩施;;湖北 [gap=1607]Keywords: biostratigraphy,lithostratigraphy,depositional hiatus,graptolites,Ordovician,Silurian,Enshi,Hubei ...
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graptolite shale [地质] 笔石页岩
graptolite shale facies 笔石页岩相
graptolite bed 笔石层
graptolite beds 笔石地层
graptolite fauna 笔石动物群
graptolite zones 笔石带
N any extinct Palaeozoic colonial animal of the class Graptolithina, usually regarded as related to either the hemichordates or the coelenterates: a common fossil, used to determine the age of sedimentary rocks 笔石
The graptolite fauna belongs to the Zhujiang sub-form of Huanan form with typical characteristics of the Pacific graptolite fauna.
该笔石动物群属于华南型的珠江亚型，具有典型的太平洋型动物群的特点。
The optical anisotropy of zooclast graptolite in some Paleozoic strata of China has been studied using reflectance cross-plot analysis.
应用反射率十字图解研究了中国部分地区下古生界地层中动物有机碎屑笔石的光学各向异性。
The nature of graptolite fauna, the correlation of the graptolite-bearing strata with that in other area and the Cambrian-Ordovician boundary are also discussed.
本文还对笔石动物群的性质进行了分析，与邻区和国外相当地层进行了对比，并讨论了本区寒武系与奥陶系界线。
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