Geology Reference
In-Depth Information
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a
1
2
1
2
()
b
1
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Valley
floor
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Figure 9.9 Paired and unpaired terraces. (a) Paired, polycyclic terraces. (b) Unpaired, noncyclic terraces. The terraces are
numbered 1, 2, 3, and so on.
Sources: Adapted from Sparks (1960, 221-23) and Thornbury (1954, 158)
()Time 1
a
()Time 2
b
()Time 3
c
Figure 9.10 Strath (bedrock) terrace formation. (a) Original V-shaped valley cut in bedrock. (b) Lateral erosion cuts
a rock-floored terrace. (c) Renewed incision cuts through the floor of the terrace.
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