Acritarches du Cambrien moyen (Miaolingien) de la Formation de Flagg Cove, île Grand Manan, Nouveau-Brunswick, Canada : répercussions stratigraphiques et corrélations possibles
DOI :
https://doi.org/10.4138/atlgeo.2024.004Résumé
Le groupe de l’Édiacarien supérieur au Cambrien inférieur de Castalia originalement défini est constitué d’une séquence basale de roches sédimentaires marines clastiques rattachées aux formations de Great Duck Island et de Flagg Cove ainsi qu’une séquence supérieure de roches principalement volcanomafiques et volcanoclastiques des formations de Ross Island, North Head, Priest Cove et Long Pond Bay. Les quelques spécimens précédemment signalés de l’ichnofossile relevé sur de longues distances Planolites dans la Formation de Flagg Cove n’étaient pas incompatibles avec l’âge U–Pb de 539,0 ± 3,3 Ma attribué à la Formation de Priest Cove ou au lien intrusif établi entre la Formation de Flagg Cove et le granite de 535 ± 2 Ma du ruisseau Stanley.
Durant une visite récente, une abondance d’ichnofossiles morphologiquement simples, dont des Planolites, a été repérée dans des strates au sud de la plage Stanley dans l’anse Flagg, conjointement avec des ichnofossiles verticalement ou obliquement orientés de plus de 10 mm de diamètre ainsi que de probables eichichnus. Cette association d’ichnofossiles remonte à une période ultérieure au Fortunien le plus précoce. Fait plus significatif, le schiste silteux gris interlité avec le grès qui abrite les traces a livré des microfossiles à parois organiques. Les microfossiles comprennent l’espèce d’acritarche Micrhystridium d’un type également présent dans la Formation de King Square dans la région de Saint John. Les microfossiles laissent supposer que la Formation de Flagg Cove remonte au Miaolingien (Cambrien moyen), ce qui nécessiterait un réexamen de son lien avec le granite du ruisseau Stanley et le groupe de Castalia. La datation fait surgir en plus la possibilité d’une corrélation avec les séquences sédimentaires clastiques du Cambrien moyen affleurant sur la partie continentale dans le sud du Nouveau-Brunswick et ailleurs dans la région.
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