Paleoenvironmental analysis of Ediacaran strata in the Catalina Dome, Bonavista Peninsula, Newfoundland

摘要: Ediacaran strata in the Conception and St. John’s groups that are exposed Catalina Dome, eastern Newfoundland, comprise a succession is thinner but otherwise broadly similar to known from well-studied outcrops near Mistaken Point southern Avalon Peninsula Spaniard’s Bay northern Avalon. In all of these areas, consist turbidites deposited deep-water basin-plain slope environments, important differences help constrain interpretations basin history paleobiology Newfoundland. A turbidite paleocurrent shift easterly southerly consistent with existing two-phase tectonic model for evolution previously proposed Peninsula. however, this occurred stratigraphically higher than at lower Spaniards Probable seismoturbidites common part succession, suggesting particularly active tectonism. Except very lowest 20 m (Drook lowermost formations) which ash absent, volcanic beds both more volumetrically significant throughout farther south east, suggests deposition closer arc. Volcanic persist stratigraphically, occurring within Fermeuse Formation, here contains diverse rangeomorph fossils contrast low-diversity assemblage discs prevalent Formation This distribution strongly reaffirms importance taphonomy controlling composition assemblages.