David R. Van Alstine, Jelle de Boer; A new technique for constructing apparent polar wander paths and the revised Phanerozoic path for North America. Geology ; 6 (3): 137–139. doi: https://doi.org/10.1130/0091-7613(1978)6<137:ANTFCA>2.0.CO;2
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The usefulness and accuracy of apparent polar wander paths may be increased by (1) grouping data into standard time intervals of about 22 m.y. duration rather than entire geologic periods; (2) insisting upon reliable paleomagnetic poles and excluding virtual geomagnetic poles as unit vectors; and (3) determining interval poles by modal rather than vectorial analysis. This method has been applied to paleomagnetic data from nearly 150 references to revise the post-Early Ordovician path for North America.