George F. Sharman, Michael S. Reichle, James N. Brune; Detailed study of relative plate motion in the Gulf of California. Geology ; 4 (4): 206–210. doi: https://doi.org/10.1130/0091-7613(1976)4<206:DSORPM>2.0.CO;2
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Detailed comparisons of a two-plate tectonic theory with evidence of transform faulting on the North American-Pacific plate boundary in the Gulf of California and on the Rivera Fracture Zone show individual data with as much as 30° of angular discrepancy. Despite systematic deviations of as much as 20° in certain areas and the consequent suggestion of possible minor platelets along the major boundary, uncertainties in models and data prevent the resolution of more than two plates.