= Solution
A <reverse fault> can create a sharp <mountain front> by raising its <hanging wall> beside a lower <footwall>. Drainages entering the rising block may be deflected along the front or cut narrow gorges across it. In cross-section, draw a dipping <fault> with the <hanging wall> displaced up-dip and a surface-height contrast above the trace.
In Attachment A, mark the \b[approximately east–west to west-northwest–east-southeast break between the southwestern mountain block and the central basin]. Its approximate image coordinates run from $(0.03,0.56)$ through $(0.18,0.61)$ and $(0.34,0.65)$ to $(0.45,0.69)$. The abrupt topographic change and diversion of drainage along this front support the <reverse faulting> interpretation. It is the southern margin of the central basin, not the much straighter oblique valley farther northeast. The original interpretive figure gives a schematic section.
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