Geography Reference
In-Depth Information
FIGURE 2.25
(A) Progressive erosion of nonplunging anticlines and syn-clines (1-7) that show topo-
graphic reversal from: (1) anticlinal mountain and synclinal valley; (2 and 3) breached anticlines;
(4 and 5) anticlinal valleys; and synclinal ridges between 5 and 6 and between 6 and 7. (B) On left
are nonplunging fold land-forms; on right are plunging fold land-forms that produce zigzag ridges
where differential erosion has left resistant rocks in relief. (After Lobeck 1939.)
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