CHAPTER VIII.

STRUCTURAL (GEOTECTONIC) GEOLOGY.

The structural phases which rocks assume, 486.

+Structural Features of Sedimentary Rocks+ 486 Stratification, 486. Lateral graduation, 488. Special markings, 489. Concretionary structure, 490. Secretions, 497.

+Structural Features of Igneous Rocks+ 498

+Structural Features Arising From Disturbance+ 500

Inclination and folding of strata, 500. Joints, 510. Sandstone dikes, 514. Faults, 514. The significance of faults, 521. Effect of faulting on outcrops, 522.