Deadman Canyon Alluvial Fan, Wassuk Range, Nevada.

Deadman Canyon Alluvial Fan, Wassuk Range, Nevada.

I am a professional geologic mapper currently employed by U.S. Geological Survey.  I am actively mapping and interpreting the how, why, and when of the ~400 km (250 mi) reach of the lower Colorado River between Hoover Dam (near Las Vegas, Nevada) and Imperial Dam (near Yuma, Arizona).