Late Middle Cambrian trilobites from Trial Ridge, southwestern Tasmania
Late Middle Cambrian trilobites from Trial Ridge, southwestern Tasmania
复制标题
DOI：
10.26749/rstpp.135.1
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
J. Jago;A. Brown
中科院分区：
文献类型：
--
作者：
J. Jago;A. Brown
塔斯马尼亚西南部的第一批中寒武世三叶虫来自亨特利1：50000岩幅上试验岭地区的粉砂岩中的两个地点。描述了16个三叶虫分类群。11个不可知种中包括一个新种，Hypagnostus trali。这是首次在塔斯马尼亚岛记录到的。这两个地方的动物群是一个非常相似的晚中寒武世的年龄，可能是高的Lejopyge laevigata区的北方澳大利亚生物地层规模。一个动物群主要由Goniagnostus nathorsti的完整标本，但很少有聚合体。在其它动物群中，不存在完整的不可知类，G. nathorsti不存在，最常见的三叶虫是原棘齿兽科的成员，因此表明前者动物群比后者起源于更深的水域
The first Middle Cambrian trilobites to be described from southwestern Tasmania come from two localities within siltstone in the Trial Ridge area on the HUNTLEY 1:50 000 sheet. Sixteen trilobite taxa are described. The 11 agnostoid species include one new species, Hypagnostus trali. Lisogoragnostus is recorded for the first time in Tasmania. The faunas of both localities are of a very similar late Middle Cambrian age, probably high in the Lejopyge laevigata Zone on the northern Australian biostratigraphic scale. One fauna is dominated by complete specimens of Goniagnostus nathorsti but has very few polymeroids. In the other fauna, there are no complete agnostoids, G. nathorsti is absent, and the most common trilobite is a member of the Proasaphiscidae, thus suggesting that the former fauna is of deeper water origin than the latter