Bulletin of the Geological Society of America . i I I T t t Figure 5.—-Foiination of a Boudin by lat-eral PrcftfiHie—a rotational Strain. Figure 6.—Recovery, clastic or otherwise,of a Boudin, after Release of lateralPressure inclosed in incompetent material; second, the concentration on thesebeds of compression great enough to thicken notably the incompetentmembers and to telescope the competent beds into boudins. Unless theoverburden were large and highlv competent, the boudin member wouldsimply arch upward. However, it arched l)oth upward aiul downward toan equal degree. Peculiarities of Bou
Bulletin of the Geological Society of America . i I I T t t Figure 5.—-Foiination of a Boudin by lat-eral PrcftfiHie—a rotational Strain. Figure 6.—Recovery, clastic or otherwise,of a Boudin, after Release of lateralPressure inclosed in incompetent material; second, the concentration on thesebeds of compression great enough to thicken notably the incompetentmembers and to telescope the competent beds into boudins. Unless theoverburden were large and highlv competent, the boudin member wouldsimply arch upward. However, it arched l)oth upward aiul downward toan equal degree. Peculiarities of Boudinage There are no ordinary structures or portions in ordinary folds wherethese boudins can be formed. They are symmetrical about a verticalaxis and about a horizontal axis; therefore they can not be formed onthe flanks of folds. The axis of a fold might give place to one boudinin a bed, but not to a string of them. A series of drag folds might give PECULIARITIES OF BOUDINAGE 657 rise to something like them, if cross-veins should separate them drag folds and boudins differ essentially in their axial parts. Adrag fo
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
