Medusaegraptus (Chlorophyta, Dasycladales) from the Pridolian to middle Lochkovian Indian Point Formation, New Brunswick, Canada
DOI:
https://doi.org/10.4138/atlgeol.2013.005Keywords:
Silurian, Algae, Dasycladales, Indian Point FormationAbstract
Carbonaceous compressions from the Pridolian to middle Lochkovian Indian Point Formation in the Flatlands area of New Brunswick comprising a central axis with irregularly arranged unbranched appendages are assigned to Medusaegraptusmirabilis. This is the first report of intact thalli of this noncalcified macroalgal taxon from a locality outside of western New York. The biotic composition, stratigraphic context, and sedimentology of this occurrence suggest a shallow-marine depositional setting roughly comparable to that for the type material of Medusaegraptus mirabilis from Gasport, New York.
RÉSUMÉLes fossiles carbonés comprimés de la formation d’Indian Point, située dans la région de Flatlands du Nouveau-Brunswick et qui date du Pridolien au Lochkovien moyen, sont attribués àMedusaegraptus mirabilis; ils présentent un axe central avec des appendices non ramifiés et disposés de façon irrégulière. C’est la première fois qu’on signale la présence de thalles intacts de ce taxon de macroalgues non calcifiées dans une localité ailleurs que dans l’ouest de l’État de New York. La composition biotique, le contexte stratigraphique et les données sédimentologiques permettent de penser à un dépôt marin peu profond à peu près comparable à ce qu’on trouve dans le cas de Medusaegraptus mirabilis de Gasport, dans l’État de New York.
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