Where the giants lived: the worlds largest ammonite Parapuzosia and its palaeoenvironment

巨人居住的地方：世界上最大的菊石Parapuzosia及其古环境

• 批准号: 388380560
• 负责人: Privatdozentin Dr. Christina Ifrim
• 金额: --
• 依托单位: Institut de géologie et de paléontologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/388380560?language=en
• 关键词: Where; giants; lived; worlds; largest

The worlds largest and likely most famous ammonite is Parapuzosia seppenradensis from the Campanian (Upper Cretaceous) of the Münsterland region in Germany. This giant was approx. 2.30 metres in diameter and was discovered 120 years ago. Little is known on the specimen and the species, as giant Parapuzosia were considered to be extremely rare. During cooperation activities and fieldwork in north-eastern Mexican state of Coahuila, however, we discovered numerous specimens in official and private collections and also found the localities, from there these giants originate. Parapuzosia appears to be a common taxon there. Here we plan to investigate these localities in order to determine the precise stratigraphic range and the palaeoenvironmental conditions during deposition. A fine-scaled biostratigraphic framework will be established providing a layer-by-layer analysis of ammonites, inoceramids, planktic foraminifers and nannofossils, and we will further calibrate this zonation by isotope stratigraphy. A morphometric and a taphonomical investigation of collected and still embedded specimens will give insight into palaeobiological aspects of giant Parapuzosia. Juvenile and adult specimens can be compared for the first time with material from both Europe and North America. The faunal elements associated with Parapuzosia (e.g. other ammonites, inoceramids) in the Mexican sections will allow us to draw further conclusions on the faunal relations between both continents. Some of these taxa also show gigantism. We will therefore discuss the question, which environmental conditions allowed for the enormous size increase in various marine molluscs in the Santonian-Campanian transition. In addition, our data will be of interest for museums worldwide that display copies of this famous German fossil. In addition, the section may be one of the completest across the Santonian-Campanian boundary at all.

世界上最大和可能最著名的菊石是Parapuzosia seppenradensis，产于德国明斯特兰地区的Campanian（上白垩纪）。这个巨人接近了。2.30直径120米，发现于120年前。对标本和物种知之甚少，因为巨大的Parapuzosia被认为是极其罕见的。然而，在墨西哥东北部科阿韦拉州的合作活动和实地考察中，我们发现了许多官方和私人收藏的标本，并发现了这些巨人的起源地。在那里，Parapuzosia似乎是一个常见的分类群。在这里，我们计划调查这些地方，以确定精确的地层范围和沉积期间的古环境条件。将建立一个精细的生物地层框架，提供一个逐层分析的菊石，inoceramids，南极有孔虫和超微化石，我们将进一步校准同位素地层学的分带。收集和仍然嵌入标本的形态测量和埋藏学研究将深入了解巨型Parapuzosia的古生物学方面。青少年和成年标本可以比较第一次与材料从欧洲和北美。与墨西哥部分的Parapuzosia（如其他菊石，inoceramids）相关的区系元素将使我们能够对两大洲之间的区系关系得出进一步的结论。这些分类群中的一些也显示出共生现象。因此，我们将讨论的问题，环境条件允许在Santonian-Campanian过渡的各种海洋软体动物的巨大规模增加。此外，我们的数据将对世界各地展示这一著名德国化石副本的博物馆感兴趣。此外，该部分可能是一个完整的跨越桑托尼亚-坎帕尼亚边界。