Gotta love the Cumulonimbus cloud. Colorado 7-31-19

[J Kerste]

 

[Joe Cameron]

looks like the side of a canyon wall.
Really neat looking

 

[James K]

Really cool cloud photo!!

With the sunset colors, it does kinda look like a canyon wall as Joe Cameron said..

 

[J. Mike Sheard]

Pileus cap as well or am I wrong?

 

[Joe Cameron]

Pileus cap as well or am I wrong?

Going and looking at other images on web for Pileus cap, i believe your right.