Five Lower Albian (Lower Cretaceous) areoligeracean dinoflagellate cyst species are present in the Carstone Formation at Middlegate Quarry, North Lincolnshire, UK: Canninginopsis monile , Circulodinium deflandrei , Cyclonephelium compactum , Cyclonephelium intonsum and Cyclonephelium longispinatum . The taxonomy of Circulodinium deflandrei is reviewed with respect to 20 measured Carstone specimens. The taxonomy of Cyclonephelium longispinatum is reviewed with respect to 70 measured Carstone specimens and a study of 40 measured specimens from its type material in Site 361, Deep Sea Drilling Project Leg 40, offshore southwestern Africa. Circulodinium deflandrei and Cyclonephelium longispinatum have recently been considered by other workers to be junior synonyms, respectively, of Circulodinium hirtellum and Tenua anaphrissa . However, following detailed study of their morphologies, the synonymies are formally rejected here. An emended diagnosis is given for C. longispinatum . A re-assessment of the stratigraphical ranges of taxa co-occurring with the type material of C. longispinatum is consistent with a Late Albian to Early Turonian age range in Site 361.

Paul Dodsworth

Roderick D. Black

Proceedings of the Yorkshire Geological Society

《约克郡地质学会会刊》（PYGS）自 1839 年以来一直不间断出版。它是英国地质学的主要期刊之一。每年都会发行两部分，其中包含有关地质各个方面的原始研究论文。传统上，会议记录特别关注英格兰北部及其邻近地区的地质情况。鼓励提交有关相关主题但具有更普遍兴趣的论文。所有论文都经过两名独立裁判的全面审查。

The Proceedings of the Yorkshire Geological Society (PYGS) has been published continuously since 1839 and is one of the leading journals in the field of geology in the UK. The journal releases two issues each year, featuring original research papers covering various aspects of geology. The conference proceedings particularly focus on the geological conditions of Northern England and its surrounding areas, while also encouraging submissions on related topics of broader interest. All submitted papers undergo thorough review by two independent referees.

《Proceedings of the Yorkshire Geological Society》（PYGS）自1839年起持续出版，是英国地质学领域的重要期刊之一。该期刊每年发行两期，涵盖地质学各个方面的原创研究论文。会议记录部分特别关注英格兰北部及其邻近地区的地质情况，同时也鼓励提交与相关主题但具有更广泛兴趣的论文。所有提交的论文均经过两名独立审稿人的严格评审。

Category	Quartile
地球科学	4
地球科学, 地质学	4

Two areoligeracean dinoflagellate cysts from the Carstone Formation (Lower Cretaceous) at Middlegate Quarry, North Lincolnshire, UK

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