In The Desert
Content including photographs are Copyright © 2014 - Present - Don & Linda Gilmore
This map shows Parowan Gap and a little to the South you'll see 2 outlined areas -- the Little Gap and the alluvial fan. On the map below you'll see the area in the lower left quadrant has an outlined section that is an Alluvial Fan.
Next time you head out on a trip in the desert keep your eyes peeled for an alluvial fan. And now you'll know what to look for.
This is probably the easiest way to show just how an alluvial fan is laid out. This also shows how they are created. Sediment and fill from behind the mountains is washed away in a deluge of rain and brought out onto the plain at the foot of the mountains. This has occured in many places in the desert.
I believe most people go right by an alluvial fan and don't realize it. Please notice the photo below which has been slightly color enhanced to better show the geology here.
Same alluvial fan but seen from a different angle. Looking down on this area is now possible to see where the sediment/fill came out of the canyon mouth and built up on the flat plain below.
Now you've seen a realatively small alluvial fan in the desert. If you'd like to see a large one then click on this LINK Once there mouse over the center of the map and you'll see a very large alluvial fan, so big it's not easily seen on the ground. This is sediment that ran out of the mountains toward the Salton Sea, Ca. probably a long time ago.
Zoom in on the area in the lower left for more detail