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标题：Late Cretaceous gastropod egg capsules from the Netherlands preserved by bioimmuration
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作者：MICHAŁ ZATOŃ ; PAUL D. TAYLOR ; JOHN W.M. JAGT 等
期刊名称：Acta Palaeontologica Polonica
印刷版ISSN：0567-7920
电子版ISSN：1732-2421
出版年度：2013
卷号：58
期号：2
页码：351-355
DOI：10.4202/app.2011.0150
语种：English
出版社：Institute of Paleobiology PAS
摘要：Clusters of gastropod egg capsules, inferred to be of neritoids and attached to the inner shell wall of the ultimate whorl of a large volutid gastropod, are here recorded from the upper Nekum Member (Maastricht Formation; late Maastrichtian) of the ENCI-Heidelberg Cement Group quarry, St Pietersberg (Maastricht, southeast Netherlands). Because the aragonitic shell of the volutid has dissolved, the outlines of the egg capsules are now revealed on the steinkern of indurated biocalcarenite, having been subsequently overgrown by cheilostome bryozoan colonies and preserved as mould bioimmurations. This represents the first example of gastropod eggs preserved through bioimmuration, as well as the first record of gastropod eggs from the Cretaceous.