. Bulletin of the Geological Society of America. Geology. 56 G. F. BECKER—STRUCTURE OF THE SIERRA NEVADA. that only a thrust acting at an angle of 45° to the fissures along that diagonal of the prism which strikes north-northeast to south-southwest would bring about the phenomena to be accounted for. This I will proceed to show by a demonstration to be found in a somewhat modified form in treatises on elasticity, but which has not hitherto, to my knowledge, appeared in geological literature. Analysis of a Thrust.—Suppose a cubical portion of the mass of granite of the Sierra, oriented as in fi
. Bulletin of the Geological Society of America. Geology. 56 G. F. BECKER—STRUCTURE OF THE SIERRA NEVADA. that only a thrust acting at an angle of 45° to the fissures along that diagonal of the prism which strikes north-northeast to south-southwest would bring about the phenomena to be accounted for. This I will proceed to show by a demonstration to be found in a somewhat modified form in treatises on elasticity, but which has not hitherto, to my knowledge, appeared in geological literature. Analysis of a Thrust.—Suppose a cubical portion of the mass of granite of the Sierra, oriented as in figure 2a, to be subjected to a uniformly distributed pressure acting from the south-southwest, this pressure being opposed to a resistance in the opposite direction. Let the uniformly distributed pressure be represented by a single force P. This force P may be considered as. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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