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|at the onset of the 635-million-year old ice age that Hoffman was studying. They |
concluded that the Snowball Earth hypothesis appeared to explain all the
available geological data related to the subject, including some I have not
|Whether or not the snowball Earth hypothesis survives scrutiny, it has motivated |
scientists to devise alternative mechanistic hypotheses. (One of these is called "
the global Black Sea hypothesis"; another, "the methane model." See
|The most recent Snowball Earth hypothesis incorporates tectonics, climate |
change, feedback, photosynthesis, and carbon isotopes into a cycle (Figure 9.16)
. We begin with the formation and rifting of a supercontinent. Polar wandering
|He had chosen a deliberately provocative title for his seminar: “The Snowball |
Earth Hypothesis: A Neoproterozoic Snow job?” The convener insisted on the
question mark. Nick hadn't wanted it in. During the lecture, Nick's main criticisms
|An alternative explanation to these paleomagnetic challenges to conventional Snowball Earth interpretation could invoke an itinerantly nonuniformitarian (anomalously weak and/or non-dipole dominated) geomagnetic field.|
Claudio Gaucher, Alcides N. Sial, Galen P. Halverson - 2009 - 498 pages
|The documentation of thick and complex glacial successions (e.g. Christie-Blick |
et al., 1999; McMechan, 2000; Allen and Etienne, 2008) alone does not
contradict the snowball Earth hypothesis, for coupled climate-ice sheet modelling
|The relatively recent snowball earth hypothesis proposed in the early 1990s |
suggests that this may have occurred more than once during the Proterozoic eon.
The hypothesis states that the entire earth was covered at least once, possibly ...
P.G. Eriksson, Wladyslaw Altermann, D.R. Nelson - 2004 - 966 pages
|They suggested that the unusual association of carbonates and glaciogenic |
diamictites was best explained by dramatic and extreme climatic perturbations
summarised in the snowball Earth hypothesis. Neoproterozoic Glaciations in the
Iain Gilmour, Mark A. Sephton - 2004 - 358 pages
|The Snowball Earth hypothesis considers an Earth that was globally frozen for |
periods of 10 Ma or more. Heat escaping from the Earth's interior prevents the
oceans from freezing to the bottom. However, surface temperatures drop to
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