Nonmarine Paleodictyon from the Carboniferous Albert Formation of southern New Brunswick
DOI :
https://doi.org/10.4138/1699Résumé
The ichnogenus Paleodictyon is documented from the Carboniferous (Mississippian - late Toumaisean) nonmarine Albert Formation of southern New Brunswick. This occurrence represents only the second formal recording of the ichnotaxon in a nonmarine setting, as elsewhere Paleodictyon is almost universally a deep-water flysch trace fossil, rarely a shallow marine neritic form. In the Albert Formation Paleodictyon is restricted to strata deposited in a freshwater shallow lacustrine environment and it occurs in association with the ichnotaxa Cochlichnus anguineus, Gordia marina, Helminthopsis tenuis, Palaeophycus striatus, Palaeophycus tubularis and Planolites. Vermiform organisms, possibly annelids, are suggested to have been potential producers of these nonmarine Paleodictyon that probably formed as a result of the regular intersection of the same or different simple burrow systems. RÉSUMÉ On signale l'ichnogenre Paleodictyon dans la Formation continentale carbonifère (Mississippien à Tournaisien tardif) d'Albert au Nouveau-Brunswick meridional. Ceci n'est que la seconde mention formelle de cet ichnotaxon en milieu continental car, ailleurs, Paleodictyon se rencontre en quasi totalité dans des flyschs d'eau profonde et rarement en domaine néritique littoral. Dans la Formation d'Albert, Paleodictyon se confine aux strates accumulées en milieu lacustre d'eau douce peu profonde, en association avec les ichnotaxons Cochlichnus anguineus, Gordia marina, Helminthopsis tenuis, Palaeophycus striatus, Palaeophycus tubularis et Planolites. On suggere que des organismes vermiformes (annelides ?) ont produit ces Paleodictyon d'eau douce, dont l'origine est viaisemblablement l’intersection réguliere d'un ou de plusieurs réseaux de gaieties simples. [Traduit par le journal]Téléchargements
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