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Archegosaurus decheni from the Carboniferous/Permian boundary of southwest Germany was a fully aquatic animal that reached a total length of almost 2 m. At least 90 partial skeletons, mostly skulls, have been found, many of them in the Lebach area. Adults and larger juveniles were mainly ichthyophagous as is indicated by the increasingly elongated snout, differentiation of marginal teeth and digestive remains (sort of a Paleozoic gharial). Skull size ranged from 18 to 280 mm in length. This Archegosaurus decheni skull is from an ironstone nodule found in the Glan Group of the Saar region in Germany. People used to dig there for ironstone nodules in open pits since the Late Iron Age (La Tène period, 500 BC). The La Tène period was named after the Iron Age La Tène culture which in turn was named after the archeological site, La Tène, on the north side of Lake Neuchâtel in Switzerland. The La Tène culture was widespread throughout Europe; archeological evidence of this culture was found in France, Switzerland, southwest Germany, Czech Republic, Slovenia, Slovakia, Hungary, and even as far as Romania. Since the iron content of these siderite concretions, Lebacher Eggs or "Lebacher Eier", as they are called in Germany, is less than 20%, these pits were closed at the end of the 19th century. Witzmann & Brainerd 2017, p. 108: Skeletal reconstruction with body outline of an adult specimen of Archegosaurus decheni from the Early Permian of the Saar–Nahe Basin, Germany. (a) dorsal view, (b) lateral view. Redrawn and modified after Witzmann (2004a) and Witzmann and Schoch (2006). References: Witzmann, F.: Morphology and paleobiology of the PermoCarboniferous temnospondyl amphibian Archegosaurus decheni Goldfuss, 1847 from the Saar-Nahe Basin, Germany, PhD thesis, Humboldt University, Berlin, 2004a. Link: FLORIAN WITZMANN & RAINER R. SCHOCH (2006): THE POSTCRANIUM OF ARCHEGOSAURUS DECHENI, AND A PHYLOGENETIC ANALYSIS OF TEMNOSPONDYL POSTCRANIA. Palaeontology, Vol. 49, Part 6, 2006, pp. 1211–1235. Link: Witzmann, Florian and Scholz, Henning (2006). "Morphometric study of allometric skull growth in the temnospondyl Archegosaurus decheni from the Permian/Carboniferous of Germany". Geobios 40: 4, pp 541–554. Link: Florian Witzmann and Elizabeth Brainerd (2017) Modeling the physiology of the aquatic temnospondyl Archegosaurus decheni from the Early Permian of Germany. Foss. Rec., 20, 105–127. Y.M. Gubin (1997) Skull morphology of Archegosaurus decheni Goldfuss (Amphibia, Temnospondyli) from the Early Permian of Germany, Alcheringa: An Australasian Journal of Palaeontology, 21:2, 103-121, DOI: 10.1080/03115519708619178