Neoproterozoic timescales and stratigraphy

  title={Neoproterozoic timescales and stratigraphy},
  author={Alan Smith},
  • Alan Smith
  • Published 2009
  • Geography, Environmental Science, Geology
Abstract The Infracambrian is a term for mostly Neoproterozoic successions in North Africa and areas to the east. Its base lies within the middle Neoproterozoic period, or Cryogenian, includes the youngest Neoproterozoic period, or Ediacaran, and continues into the early Cambrian to the level at which trilobites first appear. The Cryogenian lacks any biostratigraphic zonation; and no global biostratigraphic schemes exist for the Ediacaran. The formal classification of the Neoproterozoic is… 
Global Neoproterozoic petroleum systems: the emerging potential in North Africa
Abstract The Neoproterozoic Eon is relatively poorly known from a petroleum perspective, despite the existence of producing, proven and potential plays in many parts of the world. In tectonic,
Late Cryogenian (Neoproterozoic) glacial and post-glacial successions at the southern margin of the Congo Craton, northern Namibia: facies, palaeogeography and hydrocarbon perspective
Abstract The geological paradox of at least two Neoproterozoic glacial intervals at tropical latitudes intercalated within carbonates remains an unsolved puzzle. Several conceptual models have been
A review of the Ediacaran to Early Cambrian (‘Infra-Cambrian’) evaporites and associated sediments of the Middle East
  • A. Smith
  • Geography, Environmental Science
  • 2012
Abstract The paper reviews the age, location and extent of the late Neoproterozoic to Early Cambrian evaporite basins in the Middle East, NW India and Pakistan. The stratigraphic section discussed
Characterization of a ~1 billion year old carbonate ramp in the Brock Inlier, Arctic Canada
The Brock Inlier, Northwest Territories, comprises carbonate and siliciclastic sedimentary rocks of the early Neoproterozoic (~1000-720 Ma) Shaler Supergroup. Strata were deposited in a large
Chapter 18 Tonian–Cryogenian rifting and Cambrian–Early Devonian platformal to foreland basin development outside the Caledonide orogen
Abstract Different parts of a Tonian–Early Devonian sedimentary succession, covering Proterozoic crystalline basement, occur along the erosional front to the Caledonide orogen, as outliers and


Low-latitude glaciation in the Neoproterozoic of Oman
Although Earth is widely believed to have undergone a series of extreme low-latitude snowball glaciations during the Neoproterozoic (ca. 1000–543 Ma), only one reliable paleomagnetic result, from
Toward a Neoproterozoic composite carbon-isotope record
Glacial deposits of Sturtian and Marinoan age occur in the well-studied Neoproterozoic successions of northern Namibia, South Australia, and northwestern Canada. In all three regions, the Marinoan
New constraints on the ages of Neoproterozoic glaciations in south China
The most complete Neoproterozoic successions in south China contain three diamictite intervals in the Changan, Tiesiao, and Nantuo Formations. The youngest and most widespread Nantuo glacial deposit
The Marinoan glaciation (Neoproterozoic) in northeast Svalbard
Two separate and distinct diamictite‐rich units occur in the mixed carbonate‐siliciclastic Polarisbreen Group, which comprises the top kilometer of >7 km of Neoproterozoic strata in the northeast of
Neoproterozoic glaciation in the Earth System
The Neoproterozoic contains severe glacial intervals (750–580 Ma) including two extending to low palaeomagnetic latitudes. Paucity of radiometric dates indicates the need for chronostratigraphic
Two or four Neoproterozoic glaciations
A thick Neoproterozoic carbonate and glaciogenic succession of the southern Congo craton has yielded δ 13 C and 87 Sr/ 86 Sr records through the later Cryogenian (ca. 750–600 Ma) and earlier part of
Neoproterozoic glacial-rainout intervals: Observations and implications
Stratigraphically discrete glacigenic dropstone intervals have been identified within six separate Neoproterozoic glaciomarine successions: the ca. 720 Ma Chuos Formation (southwestern Congo craton)
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