Structural geology . y grouped with reference to the principal stress butthey retain much the same relations to the elongation and short-ening of the deformed mass, as in the case of non-rotational strainabove described. The principal stress usually intersects the obtuseangle between such fractures. One of the incidental accompaniments of fracture by shearingunder a rotational compressional stress may be development oftension fractures in planes normal to the elongation of the mass. A convenient way to remember and picture the system of frac-tures developed under the above stress-strain relati
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Structural geology . y grouped with reference to the principal stress butthey retain much the same relations to the elongation and short-ening of the deformed mass, as in the case of non-rotational strainabove described. The principal stress usually intersects the obtuseangle between such fractures. One of the incidental accompaniments of fracture by shearingunder a rotational compressional stress may be development oftension fractures in planes normal to the elongation of the mass. A convenient way to remember and picture the system of frac-tures developed under the above stress-strain relations is by Joskins, L. M., Flow and fracture of rocks as related to structure- 16thAnn. Rept. U. S. Geol. Survey, pt. 1, 1896, p. 845 et seq. COMPRESSION FRACTURES 17 1 - Itli wU | %jm 1 ) ; m / ?KmM ? ^; 1 B Fig. 3. Results of crushing wooden blocks by non-rotational strain. Xote ten-dency of fractures to follow shearing planes 4.5° to the pressure (which was fromabove; regardless of the grain of the wood.. Fig. 4. Fracture of building stone (brown sandstone) along shearing planes. After Buckley. 18 STRUCTURAL GEOLOGY