= Solution
Trace the subtle, approximately straight \b[<strike-slip fault>] that cuts across the dissected fan surfaces, descending to the right in the image. In normalized map coordinates $(u,v)$ measured from the upper left, a tracing corridor runs approximately from $(0.06,0.16)$ through $(0.35,0.30)$, $(0.65,0.46)$ and $(0.82,0.56)$ toward $(0.99,0.65)$. The broad central river interrupts the surface expression; extend the trace across that gap cautiously rather than following the river downstream.
The systematic jogs of small channels, particularly the conspicuous right-hand drainage, support \b[<right-lateral strike-slip faulting>]: draw arrows parallel to the trace, with the upper-side block toward the image right/down and the lower-side block toward the image left/up. Restore paired channel segments by reversing that sense and check that the fan rills align better. An isolated channel bend can have an erosional origin, so the consistent set of bends is stronger evidence than any one bend. No cardinal azimuth is asserted because Attachment B provides no north arrow.
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