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زمینشناسی و معدن::
بسترهای رسوبی
Here erosion has stripped away the highest portions of the overlying sedimentary beds, exposing older igneous and metamorphic rocks in the center (Fig- ure 10.12).
Because large basins contain sedimentary beds slop- ing at low angles, they are usually identified by the age of the rocks composing them.
The East Kaibab Monocline, Arizona This monocline consists of bent sedimentary beds that were deformed by faulting in the bedrock below.
Occa- sionally, small faults can be recognized in roadcuts where sedimentary beds have been offset less than a meter, as shown in Figure 10.15.
In the previous section you learned that geologists use strike (trend) and dip (inclination) to describe the orientation of planar rock features, such as sedimentary bedding and fault surfaces (Figure 10.27).
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