Abstracts
Abstract
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.
RESUME
On signale l'ichnogenre Paleodictyon dans la Formation continentale carbonifere (Mississippien a 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 totality dans des flyschs d'eau profonde et rarement en domaine neritique littoral. Dans la Formation d'Albert, Paleodictyon se confine aux strates accumulees 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 vTaisemblablement rintersection reguliere d'un ou de plusieurs reseaux de gaieties simples.
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