A new record of coleoid arm hooks from the lowermost Jurassic of Lilstock, Somerset

IF 1.2 4区 地球科学 Q2 Earth and Planetary Sciences
Simon Penn , Malcolm B. Hart , Gregory D. Price
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引用次数: 0

Abstract

We report on a new assemblage of coleoid arm hooks found in the Blue Lias (Lower Jurassic) succession near Lilstock (Somerset, UK). As there are no soft tissues or other materials (ink sac, phragmocone, etc.) preserved in the vicinity of the hooks, the genus and species cannot be accurately identified. Unlike the hooks of Clarkeiteuthis, which have distinctive inflated, bilobate bases, the hooks discussed herein are delicate, with a gently curved apex, which makes them quite similar to the arm hooks of Belemnotheutis or Acanthoteuthis. The assemblage of hooks shows a distinct organisation and, in some places, the hooks are clearly aligned as they would have been in life position. Comparable material of late Jurassic age from the Etches Collection (Kimmeridge, Dorset) is compared to the new arm hook assemblage.

萨默塞特郡利尔斯托克侏罗纪最下层鞘状臂钩的新记录
我们报告了在利尔斯托克(英国萨默塞特)附近的蓝琉璃岩(下侏罗统)演替中发现的一批新的鞘状臂钩。由于臂钩附近没有保存软组织或其他材料(墨囊、膈骨等),因此无法准确确定其属和种。与 Clarkeiteuthis 具有独特的膨大、双叶形基部的钩不同,本文讨论的钩非常精致,顶端呈平缓的弧形,这使它们与 Belemnotheutis 或 Acanthoteuthis 的臂钩非常相似。钩子的组合显示出明显的组织结构,在某些地方,钩子的排列方式与它们在生活中的位置十分相似。我们将埃特奇收藏馆(多塞特郡金默里奇)中侏罗纪晚期的类似材料与新的臂钩组合进行了比较。
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来源期刊
CiteScore
2.70
自引率
8.30%
发文量
54
审稿时长
6-12 weeks
期刊介绍: The Proceedings of the Geologists'' Association is an international geoscience journal that was founded in 1859 and publishes research and review papers on all aspects of Earth Science. In particular, papers will focus on the geology of northwestern Europe and the Mediterranean, including both the onshore and offshore record. Following a long tradition, the PGA will focus on: i) a range of article types (see below) on topics of wide relevance to Earth Sciences ii) papers on aspects of Earth Science that have societal relevance including geoconservation and Earth management, iii) papers on palaeoenvironments and palaeontology of the Mesozoic and Cenozoic, iv) papers on aspects of Quaternary geology and climate change, and v) papers on the history of geology with particular reference to individuals that have shaped the subject. These topics will also steer the content of the themes of the Special Issues that are published in the PGA.
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