Plesiosaur remains from the Jurassic-Cretaceous Purbeck Limestone Group of southern England

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• 作者：Benjamin P. Kear ; Andrew R. Milner ; Paul M. Barrett
• 关键词：Plesiosauria ; Purbeck series ; Jurassic-Cretaceous boundary ; England
• 刊名：Proceedings of the Geologists' Association
• 出版年：2009
• 出版时间：2009
• 年：2009
• 卷：120
• 期：2-3
• 页码：121-125
• 全文大小：822 K

文摘

Plesiosaur fossils from the uppermost Tithonian (Upper Jurassic) to lower Valanginian (Lower Cretaceous) Purbeck Limestone Group of Dorset, England are important because they constitute a rare record from around the Jurassic-Cretaceous boundary. Where diagnostic, the remains are referred to indeterminate plesiosauroids (Cryptocleidoidea) and represent relatively small animals including a previously undescribed juvenile individual. This observation accords with the lagoonal-lacustrine (with periodic marine influx) depositional setting of the Purbeck Limestone Group strata, a palaeoenvironment that is often associated with juvenile plesiosaur occurrences.