From paleomagnetic surveys the latitude and orientation of Great Britain and the United States relative to the axis of rotation have been inferred for successive periods in the geological column. The question then arises whether these positions agree with those indicated by paleoclimatic studies. Assuming that a trade-wind belt has been a feature of the general circulation of the atmosphere throughout geological time, an important test is to determine the ancient wind directions by the study of eolian sandstones. Determinations of the directions of dip of the large-scale cross-stratified parts of the Tensleep, Casper, and Weber formations of Permo-Pennsylvanian age in the Western United States are described. These sandstones are considered to be eolian, in which case the inferred wind directions and the results of paleomagnetism agree.

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