Neoproterozoic glaciation: Reconciling low paleolatitudes and the geologic record

  title={Neoproterozoic glaciation: Reconciling low paleolatitudes and the geologic record},
  author={George E. Williams and Phillip W. Schmidt},
  journal={Geophysical monograph},
Paleomagnetic data for Neoproterozoic glacial deposits in South Australia and elsewhere verify glaciomarine deposition near the paleoequator. Tidal rhythmites from such deposits in South Australia display symmetrical ripples indicating decades of continuous wave activity, and also record the annual oscillation of sea level. In low and moderate latitudes the annual oscillation of sea level results mostly from seasonal changes in heat content of the sea, indicating extensive and long-lived open… 
Chapter 70 The Elatina glaciation (late Cryogenian), South Australia
Abstract Deposits of the late Cryogenian Elatina glaciation constitute the Yerelina Subgroup in the Adelaide Geosyncline region, South Australia. They have a maximum thickness of c. 1500 m, cover 200
Chapter 67 Neoproterozoic glacial deposits of central Australia
Abstract There are two distinct stratigraphic levels of Neoproterozoic glacigenic deposits in central Australia, both Cryogenian in age, spread over an area greater than 2.5×106 km2. They were
The Precambrian supercontinent Palaeopangaea: two billion years of quasi-integrity and an appraisal of geological evidence
The Protopangaea-Palaeopangaea model for the Precambrian continental crust predicts quasi-integrity reflecting a dominant Lid Tectonics defined by a palaeomagnetic record showing prolonged
Chapter 69 The glacial succession of Sturtian age in South Australia: the Yudnamutana Subgroup
Abstract The record of two Neoproterozoic glaciations in South Australia has been known for about a century. The earlier glaciation, of Sturtian age, is represented by the Yudnamutana Subgroup and is
Paleomagnetic Biases Inferred From Numerical Dynamos and the Search for Geodynamo Evolution
The paleomagnetic record is central to our understanding of the history of the Earth. The orientation and intensity of magnetic minerals preserved in ancient rocks indicate the geodynamo has been
Geological setting of exceptional geological features of the Flinders Ranges
The Flinders Ranges in South Australia mainly comprise folded Neoproterozoic to Cambrian sedimentary rocks of the Adelaide Geosyncline, with local inliers of its Paleo–Mesoproterozoic igneous and m...


Low-latitude glaciation in the Palaeoproterozoic era
One of the most fundamental enigmas of the Earth's palaeoclimate concerns the temporal and spatial distributions of Precambrian glaciations. Through four billion years of Precambrian history,
Late Precambrian glacial climate and the Earth's obliquity
  • G. E. Williams
  • Environmental Science, Geography
    Geological Magazine
  • 1975
Summary Late Precambrian (∼ 750±200 Ma) glaciogenic sequences exhibit substantial evidence for marked climatic inequability of seasonal and longer periodicity (10° to ∼ 106 yrs): (1) tillites are
Paleomagnetic polarity reversals in Marinoan (ca. 600 Ma) glacial deposits of Australia: Implications for the duration of low-latitude glaciation in Neoproterozoic time
A paleomagnetic investigation of Marinoan glacial and preglacial deposits in Australia was conducted to reevaluate Australia’s paleogeographic position at the time of glaciation (ca. 610‐575 Ma). The
Late Neoproterozoic periglacial aeolian sand sheet, Stuart Shelf, South Australia
The late Neoproterozoic (ca 600 Ma) Whyalla Sandstone covers 25 000 km2 in outcrop and subcrop on the Stuart Shelf, South Australia, and is coeval with the Marinoan glaciogenic succession in the
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)
Carbon isotopic composition of Neoproterozoic glacial carbonates as a test of paleoceanographic models for snowball Earth phenomena
Consistently positive carbon isotopic values were obtained from in situ peloids, ooids, and stromatolitic carbonate within Neoproterozoic glacial successions in northern Namibia, central Australia,
Vreeland Diamictites – Neoproterozoic glaciogenic slope deposits, Rocky Mountains, northeast British Columbia
ABSTRACT Neoproterozoic diamictites of the Vreeland Formation exposed in the Snake Indian and Wapiti Pass thrust sheets of the central Rocky Mountains, northeast British Columbia, form a thick (350