Abstract

A petrofabric field and laboratory study was made of the rocks of the Pico Anticline, Los Angeles County, California, to investigate the correlation between microstructures and large scale structures and to determine the possibility of predicting large scale structures from microstructures Methods of petrofabric analysis, such as the determination of dimensional and crystallographic orientation of quartz grains, showed preferred orientations; but no well-defined relationships were noted between micro- and megastructures. The anisotropies observed in the orientation data are attributed to depositional rather than to deformational fabrics. The study of microfractures, however, provided a means of relating the microscopically observed features to the large structure. Statistically, the microfractures are strongly oriented, and the preferred orientation in any sample can be used to determine the strike and plunge of the anticline within usable angular limits.

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