New records of ammonites from the Lower Bajocian (Middle Jurassic) of England and Italy

IF 1.3 4区地球科学 Q2 Earth and Planetary Sciences

Proceedings of the Geologists Association Pub Date : 2025-04-25 DOI:10.1016/j.pgeola.2025.101117

Robert Chandler , Stefano Cresta

引用次数: 0

Abstract

The rare ammonite genus Bajocia is reported, as Bajocia *farcyi Brasil, for the first time from the Middle Jurassic, Lower Bajocian Humphriesianum Zone, Romani Subzone of Dorset, UK. Bajocia paiardinii Chandler and Cresta sp. nov. is erected from the Humphriesianum Zone, uppermost Romani or lowest Humphriesianum Subzone of Monte Nerone, Apennines, Italy. The taxonomic and stratigraphical position of the genus is considered and possible evolutionary routes are suggested. The genus is likely to have evolved in the Tethys–Panthalassa Realm or southern Mediterranean–Caucasian Subrealm. Leptosphinctids, the earliest Perisphinctidae probably originated from Western Tethyan Stephanoceratidae.

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英国和意大利下巴约西亚（中侏罗世）菊石的新记录

在英国多塞特（Dorset）的Romani亚带（Lower Bajocian Humphriesianum Zone）中侏罗统首次报道了Bajocia *farcyi Brasil这一稀有菊石属。Bajocia paiardinii Chandler and Cresta sp. 11 .是在意大利亚平宁山脉内罗内山最上层或最低汉弗里斯亚区（Humphriesianum Subzone）建造的。研究了该属的分类和地层位置，并提出了可能的进化途径。该属很可能是在特提斯-泛thalassa领域或南地中海-高加索亚领域进化而来的。钩端绦虫，最早的钩端绦虫科，可能起源于西特提斯的钩端绦虫科。

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.