Fold axes in early Paleozoic and Precambrian basement rocks of coastal Mexico, northwest of Puerto Angel, trend roughly parallel (N. 70° to 80° W.) to the coast. Fold axes in Grenville-age basement rocks between Oaxaca and the Puerto Angel-Tehuantepec area differ by 30 to 40 degrees from those northwest of Puerto Angel, trend N. 45° W., and apparently intersect the coast (between Puerto Angel and Tehuantepec) at a large angle. Thus, fold axes yield evidence only for continental fragmentation along the Puerto Angel-Tehuantepec coastal zone. Comparison of basement rock structural trends in southern Mexico and northern Central America does not yield strong support for pre-Cenozoic, Caribbean reconstructions that involve large displacements (+500 km) along the northern side of the Caribbean plate.

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