. Bulletin of the Geological Society of America. Geology; Geology -- United States. 86 G. F. BECKER—FINITE STRAIN IN ROCKS. Conclusion as to Sidle.—The fact that slaty structure occurs not only in argillaceous rocks hut, though less frequently, in limestone, grit beds, granite and basic eruptives, while it has been artificially produced in wax, clay, metals, dough and glass, throws much doubt on the hypothesis that slaty cleavage is due to re-arrangement under pressure of embedded flakes and grains of matter. This doubt seems confirmed by the fact that although the component grains of many und
. Bulletin of the Geological Society of America. Geology; Geology -- United States. 86 G. F. BECKER—FINITE STRAIN IN ROCKS. Conclusion as to Sidle.—The fact that slaty structure occurs not only in argillaceous rocks hut, though less frequently, in limestone, grit beds, granite and basic eruptives, while it has been artificially produced in wax, clay, metals, dough and glass, throws much doubt on the hypothesis that slaty cleavage is due to re-arrangement under pressure of embedded flakes and grains of matter. This doubt seems confirmed by the fact that although the component grains of many undisturbed shales and sandstones are so arranged that their largest sections lie parallel to the planes of bedding, such rocks do not show any cleavage closely resem- bling that of slate. Hence a satisfactory explanation must apply to homogeneous matter. Examination of the experimental methods of producing slaty structure shows that in all cases the distortion of a small portion of the mass is rotational, and is such as would be produced upon a cube resting on a rigid support and affected by an inclined force, with or without the co- operation of lateral forces in the plane of =Z=^. 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, etc. ] The Society
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