Full View

Contents of 11.1 What do deformed rocks look like?

11.1 What do deformed rocks look like?

• Strike and dip describe the orientation of planar geologic features such as inclined sedimentary layers and faults.
• Anticlines and synclines are distinguished by noting the dip direction of limbs of the fold.
• Breaks in rocks include: joints, where there is little or no displacement along the fracture; and faults, where offset of rock does occur.
• Dip-slip faults include normal, reverse, and thrust faults. Strike-slip include left- and right-lateral types. A combination of movements along strike and dip produce oblique-slip faults.
• Geologic maps contain colors, patterns, and standard symbols that depict rock types, their location and orientation, and the nature and location of folds and faults.
• Geologic cross sections are interpretations of rocks and structures below the ground surface, mostly based on the measured orientations of rocks and structure on the surface.