This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| Altmühl Formation | |
|---|---|
| Name | Altmühl Formation |
| Type | Geological formation |
| Period | Jurassic |
| Region | Bavaria |
| Country | Germany |
Altmühl Formation The Altmühl Formation is a Mesozoic stratigraphic unit known for its marine and marginal-marine sediments exposed in Bavaria, Germany, and associated with fossil assemblages important to paleontology, geology, and museum collections. It has been studied by institutions such as the Bavarian State Collection for Paleontology and Geology, the University of Tübingen, the University of Munich, and explored in classic field areas near the Altmühl River, the Solnhofen Plattenkalk region, and other localities celebrated in German natural history. Work on the formation links to research traditions represented by figures at the Bayerische Staatssammlung für Paläontologie und Geologie, collaborations with the Senckenberg Gesellschaft für Naturforschung, and historical collectors connected to the Natural History Museum, London.
The formation crops out across parts of Bavaria, particularly in the Franconian Jura and around the Solnhofen region, extending into basinal exposures adjacent to the Rhine Graben and correlating with sections studied near the Danube River. Field mapping by the Bavarian Geological Survey and stratigraphic syntheses by researchers affiliated with the German Geological Society chart lateral changes that link to nearby units described in works held by the British Geological Survey and referenced in comparative studies from the Muséum national d'Histoire naturelle. Key localities include quarries and classic fossil beds that have been the focus of excavation by teams from the University of Bonn, the Ludwig Maximilian University of Munich, and the University of Erlangen-Nuremberg.
Stratigraphically, the unit is placed within the Upper Jurassic succession and is subdivided into beds and members that include laminated limestones, marls, and fine-grained siliciclastic interbeds. Petrographic work by specialists at the Max Planck Institute for Biogeochemistry and geochemical studies by groups at the Helmholtz Centre Potsdam have described micritic limestones, bituminous marl layers, and occasional calcarenites comparable to horizons in the Solnhofen Limestone and sequences correlated with the Kimmeridge Clay Formation in broader European contexts. Mineralogical analyses referencing collections at the Natural History Museum, Berlin identify components such as calcite, clay minerals, and organic-rich matrices preserved in Lagerstätten-style deposits excavated by crews from the Bayerisches Nationalmuseum and examined in collaboration with curators at the Smithsonian Institution.
Biostratigraphic and radiometric work ties the formation to the Late Jurassic epoch, with ammonite, belemnite, and microfossil zonations correlated to standard chronostratigraphic columns maintained by the International Commission on Stratigraphy and compared with sections in the United Kingdom, the Netherlands, and the Switzerland. Correlations have been made to the Solnhofen Limestone, the Portland Beds, and the Kimmeridgian–Tithonian boundary intervals recognized in studies published by researchers at the University of Cambridge and the University of Oxford. Paleomagnetic and chemostratigraphic datasets developed with contributions from the GEOMAR Helmholtz Centre for Ocean Research Kiel support regional ties to Boreal and Tethyan faunal provinces discussed in syntheses by the European Geosciences Union.
The formation is renowned for exceptional preservation of marine organisms and associated vertebrates, with specimens curated in institutions such as the Jurassic Museum of Solnhofen, the Bayerische Staatssammlung für Paläontologie und Geologie, and international repositories including the Natural History Museum, London and the Smithsonian Institution. Fossil groups recovered include cephalopods (ammonites and belemnites), teleost fishes, chondrichthyans, and diverse invertebrates studied by paleontologists from the University of Bonn and the University of Tübingen. Vertebrate remains, including pterosaurs and early avialans, have attracted collaboration with researchers at the Museum für Naturkunde, Berlin and the American Museum of Natural History, while arthropod and soft-tissue preservation has informed taphonomic work associated with the Society of Vertebrate Paleontology and the Paleontological Society.
Sedimentological and paleoecological reconstructions produced by teams from the Technical University of Munich and the University of Erlangen-Nuremberg depict a shallow epicontinental basin influenced by restricted circulation, episodic anoxia, and carbonate production within a subtropical to temperate setting consistent with Late Jurassic paleogeographic maps from the Paleontological Institute and Museum, University of Zurich and plate reconstructions used by the Paleomap Project. Paleoecological analyses integrating data from associated ichnofossils, macrofauna, and microfossils have been published in collaboration with the Geological Survey of Norway and the Netherlands Centre for Biodiversity Naturalis, emphasizing faunal links to contemporaneous assemblages in the Tethys and Boreal provinces studied by the European Journal of Paleontology community.
Historically, lithologies of the unit have been quarried for lithographic stone and dimension stone used by artisans and institutions such as the Bavarian State Collection of Prints and industrial enterprises documented by the German Mining Museum. Quarrying has supported local economies in Solnhofen and surrounding villages and provided specimens for museums including the Altmühl Valley Nature Park facilities and the Paläontologisches Museum collections. Conservation and heritage management involve agencies like the Bavarian State Ministry for the Environment and Consumer Protection and collaborations with the UNESCO framework when sites overlap with protected cultural landscapes.
Category:Geologic formations of Germany Category:Jurassic stratigraphic units of Europe