The Sedan Lagerstätte is a Pliensbachian, early Jurassic fossil Lagerstätte from the Ardennes, eastern France. It provides numerous well-preserved fossils of diverse echinoderms. The estimated paleocoordinates of are taken from the Paleobiology Database.
Biota
GenusSpeciesNotesBalanocrinus B. gracilis An Isocrinida crinoid.Palaeocomaster P. benthuyi A Comatulid crinoid.Inexpectacantha I. acrobatica An Ophiacanthida ophiuroid.Palaeocoma P. milleri An Ophiacanthida ophiuroid.Eirenura E. papillata An Ophiurida ophiuroid.Sinosura S. brodiei An Ophiurida ophiuroid.Ophiomusium O. murravii An Ophiurida ophiuroid.Ophiura? O? astonensis An Ophiurida ophiuroid. The attribution of jurassic species to the extant genus Ophiura is untenable.Aspiduriella? A?sp. Might represent a relict species of the triassic Ophiurida Aspiduriella.Tropidaster T. pectinatus Asteroidea.Plumaster sp.nov. Asteroidea.Achistrum A. cf.monochordatum Holothuroidea.Binoculites B. jurassica Holothuroidea.Indet. Indet. A new species of chiridotid.Eodiadema sp. An Echinoida.Modiolus sp. A bivalve.
Paleoecology and environment The echinoderms and bivalves are present in repeated distinct beds, suggesting that they were regularly buried by storm-related sedimentation events (obrution). It is interpreted as intervals of reduced sediment input followed by high-energy storm deposition. The general climate was warm.
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