Source-to-sink sediment routing system preserved in inverted relief.
Cyan line shows 
Alcove formed by erosion of L contributes sediment to inverted channel 
which terminates in alluvial fan (orange outline). The inverted channel appears to sag in the middle,
presumably due to undermining or differential compaction after the
channel was incised.
Black crosses show the location of PEDR spots, the basis for the MOLA 
gridded terrain (color ramp).