Lytoceratid ammonites from the Inferior Oolite Formation (Middle Jurassic, Aalenian and Bajocian) of Dorset (United Kingdom)

IF 1.2 4区地球科学 Q2 Earth and Planetary Sciences

Proceedings of the Geologists Association Pub Date : 2023-04-01 DOI:10.1016/j.pgeola.2023.03.001

John T. Whicher , Robert B. Chandler , René Hoffmann

引用次数: 0

Abstract

Ammonites of the family Lytoceratidae from the Middle Jurassic Inferior Oolite Formation, Aalenian to lowermost Bathonian, of Dorset are rarely described, perhaps because the macroconchs are often very large and difficult to collect intact and the microconchs are very small and easily overlooked. Detailed stratigraphical collecting over several years has shown them to be a minor part of the ammonite fauna but more common at certain horizons. Four genera, Lytoceras, Megalytoceras Nannolytoceras and Pleurolytoceras have been shown to have different stratigraphical ranges and abundances in the Aalenian and Bajocian but they have not been found in the Lower Bathonian of Dorset. The taxonomic basis of several of the well-known species is poorly described in the literature and is remedied here.

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多塞特郡（英国）下Oolite组（侏罗纪中期、阿勒期和巴乔期）的Lytocerated菊石

多塞特郡阿连阶至巴通阶下统中侏罗纪下Oolite组Lytoceratidae科的菊石很少被描述，可能是因为大孔虫通常很大，很难完整收集，而小孔虫很小，很容易被忽视。多年来的详细地层采集表明，它们是菊石动物群的一小部分，但在某些层位更为常见。Lytoceras、Megalytoceras-Nannolytoceras和Pleurolytoceras四个属已被证明在阿伦阶和巴乔阶具有不同的地层范围和丰度，但在多塞特郡的下巴通阶尚未发现。一些著名物种的分类学基础在文献中描述得很差，在这里得到了弥补。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Geologists Association 地学-地质学

CiteScore

2.70

自引率

8.30%

发文量

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.