I.—Cambrian Hyolithidæ, etc., from Hartshill in the Nuneaton District, Warwickshire
I.—Cambrian Hyolithidæ, etc., from Hartshill in the Nuneaton District, Warwickshire
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I.—寒武纪 Hyolithidæ 等，来自沃里克郡纽尼顿区的 Hartshill
作者：
E. S. Cobbold
Charles Lap Worth 教授在他的《伯明翰地区地质概况》中给出了由 E. M. R. Wood 小姐（莎士比亚夫人）临时确定的“Hyolite 石灰岩”和相关页岩的物种清单（第 343 和 349 页）。他将这些地层概括地称为下寒武统，并将它们与康利的化石地层大致平行，但当时尚未确定其细节。目前对Woodlands采石场Hyolithidæ等的研究，充分证实了其对下寒武统的参考，看来Hyolite灰岩在动物区系序列中的位置接近或略低于当地下寒武统山顶的Olenellus和Comley灰色灰岩。这方面的证据是间接的，因为除了 Micromitra labradorica、Billings sp. 之外，还没有在这两个地方发现任何物种。然而，在北美洲发现的与哈茨希尔最接近或具有代表性的Hyolithidæ等，或多或少与在康利石灰岩中找到代表的许多三叶虫和腕足动物有密切的联系。
Professor Charles Lap Worth, in his “Sketch of the Geology of the Birmingham District”, gives a list of species (pp. 343 and 349) from “the Hyolite Limestone” and the associated shales as provisionally determined by Miss E. M. R. Wood (Mrs. Shakespeare). He referred the beds generally to the Lower Cambrian and paralleled them approximately with the fossiliferous beds of Comley, the details of which had not then been worked out. The present study of the Hyolithidæ, etc., of Woodlands Quarry, fully confirms the reference to the Lower Cambrian, and it would seem that the position of the Hyolite Limestone in the faunal sequence is near to or a little below that of the Olenellus and Grey Limestones of Comley at the local summit of the Lower Cambrian. The evidence of this is indirect, for no species has yet been identified from both localities, unless it be Micromitra labradorica, Billings sp. Nevertheless, the Hyolithidæ, etc., found in North America that are nearest to, or representative of, those of Hartshill, are there associated more or less intimately with a number of trilobites and brachiopods that find their representatives in the Comley Limestones.