Origins and assessment of snowball Earth hypotheses

  title={Origins and assessment of snowball Earth hypotheses},
  author={Walter Brian Harland},
  journal={Geological Magazine},
  pages={633 - 642}
  • W. B. Harland
  • Published 6 June 2007
  • Environmental Science, Geography
  • Geological Magazine
Brian Harland was for many years an editor of this journal. He was also a seminal figure in the origins of the current ‘snowball Earth’ debate, having recognized in 1964 the significance of coupling emerging palaeomagnetic data on palaeolatitude with his interpretations of diamictites. Harland worked extensively in the Arctic and knew well many of the workers involved in the arguments surrounding the origin of diamictites. He thus had a unique perspective on the evidence and the disputes… 

Evolution of Earth's climatic system: Evidence from ice ages, isotopes, and impacts

Multiple glaciations took place near the beginning and end of the Proterozoic Eon. Neoproterozoic (Cryogenian) glacial deposits are more widespread than those of older (Paleoproterozoic) glacial

The Location and Styles of Ice-Free “Oases” during Neoproterozoic Glaciations with Evolutionary Implications

Evidence based on molecular clocks, together with molecular evidence/biomarkers and putative body fossils, points to major evolutionary events prior to and during the intense Cryogenian and Ediacaran

Metallogenic Evolution of the Mackenzie and Eastern Selwyn Mountains of Canada’s Northern Cordillera, Northwest Territories: A Compilation and Review

The Mackenzie and eastern Selwyn Mountains, Northwest Territories, Canada, are the northeast expression of the Cordilleran orogen and have a geologic history that spans the last one billion years.

Weak tides during Cryogenian glaciations

It is shown, using an established numerical global tidal model and paleogeographic reconstructions, that the Cryogenian ocean hosted diminished tidal amplitudes and associated energy dissipation rates, reaching 10–50% of today’s rates, during the Snowball glaciations.



On Glacial Phenomena of Palæozoic Age in the Varanger Fiord

  • A. Strahan
  • Geology
    Quarterly Journal of the Geological Society of London
  • 1897
An expedition to Vadsö in the Norse King having been organized to observe the total eclipse of the sun in 1896, I took advantage of it for the purpose of examining as much of the Varanger Fiord as

Contributions to the Glacial Geology of Spitsbergen

On June 17th, 1896, the tercentenary of the discovery of Spitsbergen by Barentz, we first sighted the western coast of the great island, the unknown interior of which Sir Martin Conway's expedition

Late Proterozoic low-latitude global glaciation: the snowball Earth

A fundamental question of earth history concerns the nature of the Late Proterozoic glaciogenic sequences that are known from almost all of the major cratonic areas, including North America, the

Glacial Beds of Cambrian Age in South Australia

  • W. Howchin
  • Geology
    Quarterly Journal of the Geological Society of London
  • 1908
1. Introduction. In April 1901, the present writer read a ‘Preliminary Note on the Existence of Glacial Beds of Cambrian Age in South Australia,’ before the Royal Society of South Australia.

The Geological Time-Scale

RECENTLY Dr. K. I. Mayne, Dr. R. St. J. Lambert and D. York1 proposed an extended geological time-scale which would place the middle of the Upper Cambrian at about 650 million years ago compared with

On the Sliding or Slumping of Submarine Sediments in Denbighshire, North Wales, during the Ludlow Period

  • O. T. Jones
  • Geology
    Quarterly Journal of the Geological Society of London
  • 1937
In a paper published by the Liverpool Geological Society in 1932, Professor P. G. H. Boswell directed attention to an area in the neighbourhood of Llangerniew in north-western Denbighshire wherein

Ice Ages: Recent and Ancient

EARLY glaciologists wrote of ‘The Ice Age,’ next of ‘The Great Ice Age,’ and when it became obvious that there had been earlier refrigerations not inferior in intensity to the latest, of ‘The

Life after snowball: The oldest complex Ediacaran fossils

Newly discovered fronds of the Ediacaran index fossil Charnia from the Drook Formation of southeastern Newfoundland are the oldest large, architecturally complex fossils known anywhere. Two species

III.—Some Considerations on the Probable Conditions under which the Palæozoic Rocks were Deposited over the Northern Hemisphere

Igneous Action and Metamorphism.—I have already referred to the fact that igneous eruptions were frequent during Palæozoic time. As far as there is any evidence at present, they do not appear to have

Late Pre-Cambrian Glaciation In Scotland

  • A. Spencer
  • Geology
    Geological Society, London, Memoirs
  • 1971
Abstract This 250-word extract was created in the absence of an abstract. This was not established until Allison (1933) confirmed the sequence on Islay proposed by Bailey (1916). The formation