The world stress map (Zoback, 1992) shows almost ubiquitous anisotropic stress regimes attributable to varying and long-lived global tectonic stresses. It is highly improbable that (1) an isotropic stress state existed anywhere in the Earth's upper crust prior to 2 Ma and (2) the conclusion by Grollimund and Zoback (2003) of no pre-ice cap tectonic stresses in the north Viking Graben is based on an oversimplified model and rather selective, limited data.

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Grollimund and Zoback (2003) stated that the thick Pleistocene glacial ice overburden had a strong impact on the fault-seal integrity in oil and gas reservoirs at...

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