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Over the past 170 years, the Late Devonian Miguasha biota from eastern Canada has yielded a diverse aquatic assemblage including 20 species of lower vertebrates (anaspids, osteostracans, placoderms, acanthodians, actinopterygians and sarcopterygians), a more limited invertebrate assemblage, and a continental component including plants, scorpions and millipedes. Originally interpreted as a freshwater lacustrine environment, recent paleontological, taphonomic, sedimentological and geochemical evidence corroborates a brackish estuarine setting. Over 18,000 fish specimens have been recovered showing various modes of fossilization, including uncompressed material and soft-tissue preservation. Most vertebrates are known from numerous, complete, articulated specimens. Exceptionally well-preserved larval and juvenile specimens have been identified for 14 out of the 20 species of fishes, allowing growth studies. Numerous horizons within the Escuminac Formation are now interpreted as either  Konservat–  or  Konzentrat–Lagerstatten . SOMMAIRE Au cours des 170 dernieres annees, le biote du Devonien superieur de Miguasha de l’Est du Canada a fourni un assemblage aquatique diversifie, comprenant 20 especes de vertebres inferieurs (anaspides, osteostraces, placodermes, acanthodiens, actinopterygiens et sarcopterygiens) et un assemblage peu diversifie d’invertebres ainsi qu’une composante continentale, representee par des plantes, des scorpions et des mille-pattes. A l’origine interprete comme un milieu lacustre d’eau douce, les dernieres preuves paleontologiques, taphonomiques, sedimentologiques et geochimiques confirment un environnement saumâtre rappelant celui d’un estuaire. Plus de 18,000 fossiles de poissons ont ete decouverts montrant differents etats de conservation, notamment en trois dimensions et la preservation de tissus mous. La plupart des vertebres sont connus par de nombreux specimens complets et articules. Des specimens de larves et de juveniles, exceptionnellement bien conserves, ont ete identifiees pour 14 des 20 especes de poissons permettant des etudes detaillees de leur croissance. De nombreux horizons au sein de la Formation d’Escuminac sont interpretes soit comme des  Konservat–  ou  Konzentrat–Lagerstatten .

Great Canadian Lagerstätten 4. The Devonian Miguasha Biota (Québec): UNESCO World Heritage Site and a Time Capsule in the Early History of Vertebrates