HRTM of Alluvial Fan from Chinati Mountains terminating at Rio Grande

HRTM generated from USGS TNM 1m DEM, composted in Global Mapper and exported as a GeoTiff at a resolution of 1m spatially. The cyclic color ramp repeats every 10 meters, with the relief of ~830 m at Rio Grande on the west to ~950 m at the top of the alluvial fan to the East. The image demonstrates that fine details on low relief areas can be visualized in regions of high relief. Location is in Chinati Mountains, Presidio, TX. An interesting anomaly (to me, anyway) is that the surface of the newest - and centermost - region of this fan actually lies ~5 meters *below* the older segment to the north and south, suggesting it is cutting into the old fan. Sign of uplift or climate change?