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THE EDIACARA BIOTA: Neoproterozoic Origin of Animals and Their Ecosystems
- G. Narbonne
- Geography, Environmental Science
- 31 May 2005
Present evidence suggests that the Ediacara biota included a mixture of stem- and crown-group radial animals, stem-group bilaterian animals, “failed experiments” in animal evolution, and perhaps representatives of other eukaryotic kingdoms.
Late-Neoproterozoic Deep-Ocean Oxygenation and the Rise of Animal Life
The iron content of deep-sea sediments shows that the deep ocean was anoxic and ferruginous before and during the Gaskiers glaciation 580 million years ago and that it became oxic afterward.
Isotopes, ice ages, and terminal Proterozoic earth history.
- A. J. Kaufman, A. Knoll, G. Narbonne
- Environmental Science, GeologyProceedings of the National Academy of Sciences…
- 24 June 1997
Detailed correlations of ancient glacial deposits, based on temporal records of carbon and strontium isotopes in seawater, indicate four (and perhaps five) discrete ice ages in the terminal…
Late Neoproterozoic cap carbonates: Mackenzie Mountains, northwestern Canada: precipitation and global glacial meltdown
The 3-27 m-thick cap carbonate overlying "Marinoan" Ice Brook Formation glacigene sediments and Keele Formation carbonate and terrigenous clastic rocks consists of two distinctive stratigraphic…
Ferruginous Conditions Dominated Later Neoproterozoic Deep-Water Chemistry
It is reported that through much of the later Neoproterozoic, anoxia remained widespread beneath the mixed layer of the oceans; deeper water masses were sometimes sulfidic but were mainly Fe2+-enriched, marking a return to ocean chemistry not seen for more than one billion years of Earth history.
The first named Ediacaran body fossil, Aspidella Terranovica
Aspidella terranovica Billings, 1872 was first described from the late Neoproterozoic Fermeuse Formation (St. John's Group) on the Avalon Peninsula of eastern Newfoundland, approximately 1km…
The Ediacaran Period: A New Addition to the Geologic Time Scale
The International Union of Geological Sciences has approved a new addition to the geologic time scale: the Ediacaran Period. The Ediacaran is the first Proterozoic period to be recognized on the…
Modular Construction of Early Ediacaran Complex Life Forms
- G. Narbonne
- Environmental ScienceScience
- 20 August 2004
Newly discovered, exceptionally preserved, soft-bodied fossils near Spaniard's Bay in eastern Newfoundland exhibit features not previously described from Ediacaran (terminal Neoproterozoic) fossils.…
A candidate stratotype for the Precambrian-Cambrian boundary, Fortune Head, Burin Peninsula, southeastern Newfoundland
The Burin Peninsula exhibits an exceptionally thick and essentially continuous succession of marine strata through the Precambrian–Cambrian transition. Fossils are abundant and include trace fossils,…