Alluvial fans unconformably postdate large-river deposits. 
Wrinkle ridge (black dashed line) deflects alluvial fans
(orange arrows) but inverteed channels underlying the alluvial fans
(blue arrows) can be traced across the wrinkle ridge. 
Therefore thrusting postdates inverted channels and predates alluvial 
fans. (Rugged, yardang-forming material overlies alluvial fans - yellow
arrow). Inset (thin black rectange outlines location) shows detail. 
P17_007830_1754_XI_04S206W covers the main relationships..